JSON Schema generator from sample JSON
Infer a Draft-07-compatible JSON Schema from sample JSON, then copy or download it.
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DMARC record generator
Build a DMARC DNS TXT record from policy, aggregate-report address, percentage, and alignment settings.
Open →SPF record generator
Build an SPF TXT value from sending IPs, include domains, a/mx mechanisms, and an all policy.
Open →CAA record generator
Generate CAA record lines for permitted certificate authorities and optional iodef reporting.
Open →DNS TXT record formatter
Split long TXT values into 255-character chunks and format them for DNS configuration.
Open →llms.txt generator
Draft an llms.txt file from a site name, summary, and key pages. It is guidance metadata, not access control.
Open →AI crawler robots.txt generator
Generate robots.txt blocks for selected AI crawler user agents with allow or disallow rules.
Open →X-Robots-Tag generator
Build an X-Robots-Tag HTTP header value from noindex, nofollow, nosnippet, and preview directives.
Open →HSTS header generator
Build a Strict-Transport-Security header from max-age, includeSubDomains, and preload options.
Open →300 DPI pixel dimensions calculator
Calculate the pixel dimensions required for a physical print size at 300 DPI.
Open →350 DPI pixel dimensions calculator
Calculate the pixel dimensions required for a physical print size at 350 DPI.
Open →600 DPI pixel dimensions calculator
Calculate the pixel dimensions required for a physical print size at 600 DPI.
Open →A4 pixel dimensions by DPI calculator
Calculate A4 pixel dimensions (210 × 297 mm) at any DPI, in portrait or landscape.
Open →Pixels to print size calculator
Convert pixel dimensions and DPI into physical print size in millimetres and inches.
Open →Weighted random name picker
Pick one name randomly with probability proportional to a weight you assign to each entry.
Open →No-repeat random name picker
Draw names one at a time without repeating a name until the list is reset.
Open →Pick multiple random names
Select multiple unique names at random from a list in one draw.
Open →Random order generator
Shuffle a list into a random order and return a numbered sequence.
Open →Random number draw without replacement
Draw multiple unique integers from a range without replacement.
Open →File transfer time calculator with latency
Estimate file transfer time from file size, throughput, latency and an estimated number of round trips.
Open →Upload time calculator
Estimate upload duration from file size and upstream speed.
Open →Download Time Calculator
Enter file size and download speed to see how long the download will take.
Open →Disk copy time calculator
Estimate local file copy time from data size and effective transfer speed in MB/s.
Open →Data migration time calculator
Estimate migration duration from data volume, throughput and an effective utilization percentage.
Open →Business days from a date calculator
Add N business days to a start date while skipping weekends and optional excluded dates.
Open →Business days before a date calculator
Subtract N business days from a date while skipping weekends and optional excluded dates.
Open →3–5 business days date range calculator
Convert a business-day range such as 3–5 days into earliest and latest calendar dates.
Open →RGB to HSL converter
Convert RGB values (0–255) to HSL hue, saturation and lightness.
Open →HSL to RGB converter
Convert HSL hue, saturation and lightness into RGB values (0–255).
Open →RGB to HEX converter
Convert RGB values (0–255) into a #RRGGBB hexadecimal color code.
Open →HEX to RGB converter
Convert #RGB or #RRGGBB hexadecimal colors into RGB values.
Open →URL parser online
Parse a URL into protocol, host, port, path, query parameters and fragment.
Open →HTTP request parser online
Parse a raw HTTP request into request line, headers and body without sending it.
Open →ISO 8601 date parser and converter
Parse an ISO 8601 datetime and convert it to UTC, local time and Unix timestamps.
Open →WebP to PNG converter
Convert a WebP image to PNG locally in your browser and download the result.
Open →Regex tester online
Test JavaScript regular expressions with flag checkboxes, highlighted matches, indexes, capture groups, named groups, and replacement previews.
Open →Markup to margin calculator
Convert markup percentage on cost into gross margin percentage on selling price.
Open →Mercari Shops 130-character product name checker
Find blank or over-130-character product names in a Mercari Shops bulk registration CSV.
Open →Mercari Shops 3,000-character description checker
Find product descriptions longer than the documented 3,000-character limit before Mercari Shops import.
Open →Mercari Shops condition code 1–6 checker
Validate Mercari Shops condition codes as the documented numeric values 1 through 6.
Open →Mercari Shops shipping method code 1–6 checker
Validate Mercari Shops shipping method codes as the documented numeric values 1 through 6.
Open →Mercari Shops inventory delta flag checker
Check that Mercari Shops inventory delta flags (1/2) and positive delta quantities are paired correctly.
Open →BASE new-product blank default value checker
Warn when new BASE product rows leave price, stock or publication fields blank and therefore rely on defaults.
Open →Shopify CSV Status Checker
Validate Shopify product CSV Status values as active, draft or archived.
Open →Shopify Inventory Tracker CSV Checker
Check Shopify Inventory tracker values and flag entries outside the documented/common values.
Open →Shopify Continue Selling CSV Checker
Validate Continue selling when out of stock as deny, continue or blank/default.
Open →Shopify Weight CSV Checker
Check integer gram weight values and display units g, kg, lb or oz in Shopify product CSV files.
Open →Shopify Fulfillment Service CSV Checker
Check standard fulfillment values and the lowercase-hyphen syntax for custom fulfillment service handles.
Open →Shopify Variant CSV Checker
Check that rows updating SKU, barcode, weight or inventory also include the required Option1 name/value context.
Open →WooCommerce Published value CSV checker
Validate WooCommerce Published values as 1, 0, -1, 2, true or false.
Open →WooCommerce catalog visibility CSV checker
Validate WooCommerce catalog visibility values as visible, catalog, search or hidden.
Open →WooCommerce Tax status CSV checker
Validate WooCommerce Tax status values as taxable, shipping or none.
Open →WooCommerce stock and backorders CSV checker
Check WooCommerce In stock?, Stock and Backorders allowed? values before import.
Open →WooCommerce price, weight and dimension number checker
Check regular/sale prices, weight and dimensions for plain numeric values before WooCommerce import.
Open →WooCommerce Images field and URL checker
Split WooCommerce Images entries and validate external image URLs and whitespace before import.
Open →Google Merchant Center price format checker
Validate Merchant Center price values in number + 3-letter currency format, such as 15.00 USD.
Open →Google Merchant Center availability value checker
Validate availability values and require availability_date context for preorder/backorder rows.
Open →Google Merchant Center condition value checker
Validate Merchant Center condition values as new, used or refurbished.
Open →Google Merchant Center GTIN length and checksum checker
Normalize spaces/dashes and validate 8, 12, 13 or 14-digit GTINs and their GS1 check digit.
Open →Google Merchant Center identifier_exists checker
Validate yes/true/no/false and warn about obvious conflicts with GTIN, MPN and brand fields.
Open →Google Merchant Center title and description length checker
Check required title/description values and the 150/5,000-character limits in a Merchant Center feed.
Open →Mercari Shops CSV encoding checker
Check whether a Mercari Shops CSV decodes cleanly as Shift_JIS or UTF-8 before upload.
Open →Mercari Shops half-width space CSV checker
Find half-width spaces outside product name and description fields, a documented Mercari Shops import error cause.
Open →Mercari Shops SKU management code and JAN checker
Validate Mercari Shops SKU management codes and JAN values for documented length and character rules.
Open →Mercari Shops 10,000-row product CSV limit checker
Count product rows and flag CSV files that exceed the documented 10,000-product bulk registration limit.
Open →BASE product image ZIP structure checker
Check a BASE image ZIP for nested folders, non-ASCII filenames and the 1 GB batch limit before import.
Open →BASE variation name duplicate and length checker
Check BASE product CSV variation names for duplicates within a product and values longer than 255 characters.
Open →STORES inventory CSV 5,000-row limit checker
Count STORES inventory CSV rows and flag uploads that exceed the documented 5,000-item limit.
Open →STORES inventory CSV duplicate variation ID checker
Find duplicate variation IDs in a STORES inventory CSV before upload.
Open →STORES inventory CSV stock value checker
Validate STORES inventory update values as integers from 0 to 9,999 or the supported unlimited value.
Open →ColorMe CSV 59/60-column count checker
Count columns per row and flag ColorMe CSV rows that do not match the documented 59-column registration or 60-column update formats.
Open →ColorMe CSV comma, newline and quote checker
Detect malformed quoting and row-width changes caused by commas, newlines or double quotes in ColorMe CSV files.
Open →Shopify Handle Duplicate Checker
Find duplicate product handles and handle rows without titles before Shopify CSV import.
Open →Shopify Duplicate Options CSV Checker
Detect duplicate option-value combinations within the same Shopify product handle before import.
Open →Shopify CSV Quoting Checker
Check UTF-8 encoding and malformed CSV quoting that can trigger Shopify “Illegal quoting on line” errors.
Open →WooCommerce variation Parent and SKU checker
Check WooCommerce variation rows for duplicate SKUs, missing Parent references and missing attribute values before import.
Open →Google Merchant Center core product feed checker
Check core Google Merchant Center feed attributes, availability values and price syntax before upload.
Open →Mercari Shops product CSV preflight checker
Check encoding, headers, length limits, spaces and required values before importing a Mercari Shops product CSV.
Open →Mercari Shops product_import_result CSV error analyzer
Read a Mercari Shops product_import_result CSV and group common import errors by row.
Open →Mercari Shops bulk image upload preflight checker
Check image formats, the 8 MB per-image limit, 1 GB batch size and duplicate filenames before bulk upload.
Open →Mercari Shops bulk update CSV preflight checker
Check product IDs, SKU IDs and multi-column requirements for inventory and image updates before upload.
Open →Mercari Shops CSV image name and URL checker
Check image name and URL columns for spaces, URL syntax, extensions and duplicates before import.
Open →BASE product CSV and image ZIP consistency checker
Match image filenames referenced by a BASE product CSV against a ZIP archive and find missing or risky filenames.
Open →BASE product ID and variation CSV safety checker
Check blank product/variation IDs and stock-field combinations that can create new products or fail updates in BASE.
Open →STORES inventory CSV bulk-update checker
Check the 5,000-item limit, duplicate variation IDs and invalid stock values before a STORES inventory CSV upload.
Open →Shopify CSV Validator — Product Import Preflight
Check UTF-8, required fields, prices, fulfillment values, duplicate options and image URLs before Shopify import.
Open →Shopify Image URL CSV Checker
Check Shopify Image Src values for http/https syntax, spaces, duplicates and obvious non-direct links.
Open →WooCommerce product CSV preflight checker
Check UTF-8, required names, duplicate SKUs, product types, statuses, parents and images before WooCommerce import.
Open →Google Merchant Center image_link checker
Check image_link values in a product feed CSV for URL length, scheme, ASCII, supported image formats and unencoded characters.
Open →ColorMe product CSV checker
Check product create/update CSVs before upload.
Open →STORES item CSV checker
Check encoding, price, stock and duplicate values before import.
Open →ColorMe customer CSV checker
Check the customer import format and common field errors.
Open →ColorMe product option CSV checker
Check the option CSV, name/item order and numeric fields.
Open →Klaviyo historical event CSV checker
Validate Timestamp, Person//Email / ID and $event_id before import.
Open →Klaviyo profile / list CSV checker
Check identifiers, duplicates and the 50 MB limit before list import.
Open →Google Ads Customer Match CSV checker
Check headers, email, phone, address fields and encoding before upload.
Open →e-Hiden III CSV format checker
Check encoding, delimiter, CSV syntax and signs of Excel tab conversion.
Open →CSV encoding & delimiter inspector
Inspect likely encoding and comma, tab, semicolon or pipe delimiters.
Open →Excel-damaged CSV checker
Find tab conversion, scientific notation and date-like coercion after Excel edits.
Open →CSV header diff checker
Compare header names, order, missing columns and extra columns.
Open →CSV duplicate finder
Find duplicate values and row numbers in a selected column.
Open →CSV row splitter
Split a large CSV into files with a chosen number of rows.
Open →CSV merger
Merge multiple CSV files with matching headers.
Open →CSV mojibake & character risk checker
Find emoji and special characters that often cause problems in Shift_JIS-based imports.
Open →CSV ⇄ TSV converter
Convert between CSV and tab-separated text in your browser.
Open →SRT / WebVTT subtitle checker
Check timestamps, cue order, start/end times and basic subtitle errors.
Open →ICS / iCalendar checker
Check VCALENDAR / VEVENT structure, UID, DTSTART and basic fields.
Open →Japanese era / Gregorian date converter
Convert Japanese era dates and Gregorian dates line by line.
Open →Japan phone number normalizer
Normalize Japanese phone numbers and convert between domestic and +81 forms.
Open →Today’s fortune gacha
Draw a lighthearted fortune and lucky action for today.
Open →YES / NO oracle
Let a playful oracle answer a simple yes-or-no question.
Open →Lunch roulette
Pick one lunch option at random.
Open →Random name picker
Pick one name or item at random.
Open →Random team maker
Shuffle names into a chosen number of teams.
Open →Seat shuffler
Create a randomized numbered seating order.
Open →Conversation topic gacha
Draw a conversation topic for friends, family or a casual date.
Open →Light penalty gacha
Draw a harmless, lighthearted game penalty.
Open →16-type compatibility gacha
A playful unofficial compatibility gacha for two four-letter types. Not a psychological assessment.
Open →16-type message of the day
Choose a four-letter type and draw a playful message for today.
Open →Text / line counter
Count characters, spaces, word-like segments, lines, paragraphs, UTF-8 bytes, and Unicode code points in real time, with optional filters and local snapshots.
Open →Duplicate line remover
Remove duplicate lines while keeping the first occurrence.
Open →Line sorter
Sort lines ascending, descending, or by length, with optional natural ordering, locale, sensitivity, trimming, blank-line removal, and deduplication.
Open →Text diff
Compare two texts line by line and show additions / removals.
Open →URL encoder / decoder
Percent-encode or decode URL text.
Open →JSON formatter / validator
Format or minify JSON, locate syntax errors by line and column, choose indentation, optionally sort keys, inspect structure metrics, and copy or download the result.
Open →Base64 encoder / decoder
Encode or decode Unicode text as Base64.
Open →Unix timestamp converter
Convert Unix seconds / milliseconds and human-readable dates.
Open →Discount calculator
Calculate final price and savings from a discount rate.
Open →Percentage calculator
Calculate percentages, percentage values and change rates.
Open →Ratio calculator
Solve proportions, simplify ratios, and normalize values around 1.
Open →Age calculator
Calculate age from a birth date and target date.
Open →Date difference calculator
Calculate the difference between two dates in days and weeks.
Open →UUID v4 / v7 generator
Generate one UUID v4 or RFC 9562 UUID v7 locally in the browser.
Open →SHA hash generator
Generate SHA-256 / 384 / 512 hashes locally in your browser.
Open →HEX / RGB / HSL converter
Convert HEX or RGB colors to HEX, RGB and HSL.
Open →Password generator
Generate random passwords locally with chosen character sets.
Open →URL slug generator
Turn a title or phrase into a URL-friendly slug.
Open →Text case converter
Convert text to upper, lower, title, snake, kebab or camel case.
Open →Line shuffler
Shuffle input lines into a random order.
Open →Random number picker
Draw random numbers within a chosen range.
Open →Book / zine weight estimator
Estimate total book/zine weight from trim size, pages, paper gsm and quantity.
Open →Convention box count estimator
Estimate shipping box count from total item volume and box dimensions.
Open →Dimensional weight calculator
Calculate dimensional weight with a configurable carrier divisor.
Open →Print bleed size calculator
Calculate document size including bleed from final trim dimensions.
Open →DPI / pixel size calculator
Convert physical print size and DPI into required pixel dimensions.
Open →Cover spread size calculator
Calculate full cover spread size including spine and bleed.
Open →Booklet sheet count calculator
Calculate physical sheet count from page count.
Open →Booklet page multiple checker
Check whether booklet page count is a multiple of 4.
Open →Spine width estimator
Estimate spine width from page count and custom sheet thickness.
Open →Artist Alley table fit calculator
Check whether display elements fit across a convention table.
Open →Display grid calculator
Calculate how many products fit in a display grid.
Open →Cash float planner
Estimate a practical cash float from prices and expected cash sales.
Open →Event break-even calculator
Calculate units needed to break even on an event.
Open →Convention profit calculator
Calculate convention/event profit and margin.
Open →Multi-day inventory split planner
Split total inventory across event days using custom weights.
Open →Bundle pricing calculator
Calculate bundle price and savings from item prices and target discount.
Open →Leftover return box estimator
Estimate return shipping boxes for unsold books.
Open →Convention packing list generator
Turn rough notes into a categorized convention packing checklist.
Open →Page filename sequence checker
Check page filename lists for missing or duplicate sequence numbers.
Open →Price tag sheet layout calculator
Calculate how many price tags fit on one print sheet.
Open →Unit price comparer
Compare two products by unit price.
Open →Margin / markup calculator
Calculate gross profit, margin and markup.
Open →Tax inclusive / exclusive calculator
Convert tax-inclusive and tax-exclusive prices with a custom rate.
Open →Hourly rate calculator
Calculate required hourly rate from target monthly income.
Open →Work hours calculator
Calculate net working time from start, end and break.
Open →Business days calculator
Calculate business days between two dates with optional Japanese holidays, custom working weekdays, endpoint inclusion, and custom closure dates or ranges.
Open →Date add / subtract calculator
Add or subtract days/weeks from a date.
Open →Time duration calculator
Calculate elapsed time between two clock times, including overnight.
Open →Recipe scaler
Scale recipe quantities for a different serving count.
Open →Fuel trip cost calculator
Estimate fuel cost from distance, efficiency and fuel price.
Open →Electricity cost estimator
Estimate electricity cost from wattage, hours and kWh rate.
Open →File Transfer Time Calculator
Enter file size and transfer speed to estimate how long the transfer will take.
Open →Storage unit converter
Convert decimal and binary storage units.
Open →Aspect ratio calculator
Simplify an aspect ratio and calculate matching dimensions.
Open →Image resize calculator
Calculate resized dimensions while preserving aspect ratio.
Open →CSS clamp() generator
Generate a fluid CSS clamp() expression from viewport and size ranges.
Open →UTM URL builder
Build a URL with standard UTM parameters.
Open →mailto link builder
Generate a mailto link from recipient, subject and body.
Open →URL query parser
Parse URL query parameters into a readable list.
Open →TOTP generator (2FA code)
Generate TOTP codes locally from a Base32 secret or otpauth:// URI.
Open →JWT decoder
Decode JWT header and payload locally. Signature is not verified.
Open →JSON key sorter
Recursively sort JSON object keys alphabetically.
Open →JSON array deduplicator
Remove duplicate values/objects from a JSON array.
Open →XML formatter
Format and validate XML in the browser.
Open →Markdown table generator
Generate a Markdown table from tab- or comma-separated rows.
Open →List intersection tool
Extract lines that appear in both lists.
Open →List difference tool
Extract lines unique to list A or list B.
Open →Find and replace tool
Find and replace text using literal or regular-expression matching, with flags, replace-all or first-only scope, case options, and match-count preview.
Open →Line prefix / suffix tool
Add the same prefix and suffix to every line.
Open →CSV column extractor
Extract selected columns from pasted CSV.
Open →CSV row filter
Filter pasted CSV rows by a keyword in a selected column.
Open →Pick HEX and RGB Colors from an Image
Click a point in an image to sample its HEX and RGB color.
Open →Resize an Image to Exact Pixel Dimensions
Resize an image to the pixel dimensions you need.
Open →Compress an Image by Quality and Maximum Width
Reduce image file size by changing quality and maximum width.
Open →Crop an Image by Coordinates and Size
Crop an exact image area using coordinates and dimensions.
Open →Convert Images between PNG, JPEG, and WebP
Convert an image between PNG, JPEG, and WebP.
Open →Remove a Selected Color and Make a Transparent PNG
Remove a selected color and export a transparent PNG.
Open →Edit HTML and Preview the Browser Result
Edit HTML and preview the rendered browser result.
Open →Format Minified HTML with Lines and Indentation
Add line breaks and indentation to compressed HTML.
Open →Format One-line SQL with Readable Line Breaks
Format one-line SQL into a more readable layout.
Open →Minify CSS, JavaScript, or HTML
Create a smaller copy of CSS, JavaScript, or HTML.
Open →Preview How Markdown Will Render
Enter Markdown and check how it will render.
Open →Encode or Decode HTML Entities
Encode special HTML characters or restore entity references.
Open →Convert Images to and from Base64 Data URLs
Convert between image files and Base64 Data URLs.
Open →Inspect Unicode Code Points for Text
Inspect Unicode code points for text, symbols, and emoji.
Open →Convert Text, Binary, Decimal Bytes, and Hex
Convert between text and binary, decimal, or hexadecimal bytes.
Open →Calculate Typed Expressions with Parentheses
Type an expression and calculate it directly in your browser.
Open →Run a Countdown Timer in Your Browser
Count down from a chosen duration in your browser.
Open →Run a Stopwatch with Lap Times in Your Browser
Measure elapsed time and lap times in your browser.
Open →Extract Unique Email Addresses from Text
Extract email addresses from long text and remove duplicates.
Open →Create a Custom Placeholder Image
Create a placeholder PNG with exact dimensions and colors.
Open →QR Code Generator
Create a QR code from a URL or text in your browser, export PNG/SVG, and verify it by re-scanning.
Open →Logo QR Code Maker
Create a QR code with a centered logo or illustration, export PNG/SVG, and re-scan it in your browser.
Open →Design QR Code Maker
Create a styled QR code with custom dots, colors and gradients, export PNG/SVG, then verify it by re-scanning.
Open →QR Code Test — Scannability Checker
Test a QR image at full size, reduced size, lower contrast and light blur before publishing or printing.
Open →Favicon & App Icon Generator
Generate favicon.ico and PNG icons from 16 to 512 px from one image in your browser.
Open →Extract PDF Pages
Select pages from a PDF and save them as a new PDF. The file is processed in your browser.
Open →Delete PDF Pages
Remove selected pages from a PDF and save the remaining pages as a new PDF.
Open →YouTube Transcript Cleaner
Paste a YouTube transcript, remove timestamps and adjacent duplicates, and clean it into readable text.
Open →Merge PDF files
Merge multiple PDF files in the selected order and save them as one PDF.
Open →Compress PDF / reduce file size
Compress PDF files in your browser. Safe optimization avoids rasterizing pages; optional raster compression is available when you need stronger reduction.
Open →Split PDF
Split a PDF into multiple files by a chosen number of pages.
Open →Reorder PDF pages
Reorder PDF pages by entering a new order such as 3,1,2,4-6.
Open →Rotate PDF pages
Rotate selected PDF pages by 90°, 180°, or 270° and save the result.
Open →Images to PDF
Convert multiple images into a single PDF in the selected order.
Open →PDF to PNG / JPG
Render each PDF page as a PNG or JPEG image.
Open →Add page numbers to PDF
Add page numbers to a PDF with position, start number, and font size controls.
Open →Add watermark to PDF
Add a text watermark to every PDF page with opacity, angle, and size controls.
Open →Add signature image to PDF
Place a signature or stamp image on selected PDF pages and save the PDF.
Open →Extract images from PDF
Detect image objects used inside a PDF and export them as PNG files.
Open →HEIC / HEIF to JPG / PNG
Convert HEIC or HEIF images to JPEG or PNG in your browser.
Open →AVIF to PNG / JPG
Convert AVIF images to PNG or JPEG.
Open →SVG to PNG / JPG
Render SVG to PNG or JPEG at a chosen width.
Open →Batch image compressor
Compress multiple images with chosen format, quality, and maximum width.
Open →Batch image resizer
Resize multiple images to the same dimensions or maximum long edge.
Open →Rotate / flip image
Rotate an image in 90° steps and flip it horizontally or vertically.
Open →EXIF metadata viewer
Inspect EXIF, camera, date, GPS, and other image metadata.
Open →Remove EXIF / GPS metadata
Re-encode an image to remove EXIF, GPS, and other metadata.
Open →Image watermark maker
Add a text watermark to an image with position, opacity, and size controls.
Open →Image mosaic / blur
Apply a mosaic effect to a selected rectangular area of an image.
Open →JSON diff checker
Compare two JSON values and list added, removed, and changed paths.
Open →JSON Schema validator
Validate JSON data against a JSON Schema (Draft-07 style) and show errors.
Open →JSONPath tester
Run common JSONPath expressions against JSON and inspect matched values.
Open →JSON ↔ YAML converter
Convert between JSON and YAML and check syntax errors.
Open →CSV ↔ JSON converter
Convert between CSV and JSON arrays, including quoted fields and line breaks.
Open →Cron expression builder / parser
Build and validate 5-field cron expressions with presets, a human-readable explanation, dialect notes, and a preview of the next five run times.
Open →User-Agent parser
Estimate browser, operating system, and device type from a User-Agent string.
Open →CIDR / subnet calculator (IPv4 & IPv6)
Calculate normalized IPv4/IPv6 CIDR ranges, first/last addresses and total size.
Open →IP range to CIDR converter
Convert an IPv4 or IPv6 start/end range into the smallest exact CIDR list.
Use →TITLE / META length checker
Check title and meta description character counts, UTF-8 bytes, and recommended ranges.
Open →SERP preview
Preview how a title, URL, and description may look in a search result.
Open →PDF page organizer
Reorder, delete, and rotate PDF pages in one workflow.
Open →Add text to PDF
Add text to selected PDF pages with position, color, and size controls.
Open →PDF metadata viewer / remover
Inspect PDF title, author, dates, and other metadata, and create a copy with basic metadata cleared.
Open →Extract text from PDF
Extract text from selected or all PDF pages and save it as TXT.
Open →PDF page size checker
List every PDF page size in points, millimeters, and inches.
Open →Resize PDF pages
Resize all PDF pages to A-series, Letter, or custom sizes with content fitting options.
Open →Crop PDF pages
Crop PDF page boxes by specified top, bottom, left, and right margins.
Open →Convert PDF to grayscale
Rasterize PDF pages and rebuild them as a grayscale PDF.
Open →Convert PNG/JPG/WebP to AVIF
Convert PNG, JPEG, or WebP images to AVIF with adjustable quality.
Open →GIF frame extractor
Extract animated GIF frames as individual PNG images.
Open →Batch image format converter
Convert multiple images to JPEG, PNG, WebP, or AVIF and optionally download a ZIP.
Open →Image comparison slider
Overlay two images and compare before/after with an interactive slider.
Open →Image color palette extractor
Extract frequent colors from an image and show HEX codes and approximate shares.
Open →Dominant / average image color
Calculate an image’s dominant color and average color as HEX values.
Open →Convert image to grayscale
Convert an image to grayscale and save it as PNG, JPEG, or WebP.
Open →Rounded / circle image crop
Crop an image to rounded corners or a circle and save a transparent PNG.
Open →Social media image resizer / cropper
Crop images to common Instagram, Story, X, OGP, YouTube, and LinkedIn sizes.
Open →SVG optimizer / minifier
Validate SVG syntax and reduce size by removing comments and unnecessary whitespace.
Open →ICO to PNG converter
Extract icon images from an ICO file as PNG files by size.
Open →PNG to ICO converter
Create a favicon.ico containing multiple PNG-compressed sizes from 16 to 256 px.
Open →vCard QR code generator
Create a vCard QR code from name, organization, phone, email, and URL fields.
Open →Meta tag generator
Generate basic title, description, robots, and viewport tags.
Open →Open Graph / OGP preview
Preview a social Open Graph card from title, description, URL, and image URL.
Open →Open Graph tag generator
Generate Open Graph tags including title, description, URL, image, and card type.
Open →Canonical tag generator
Generate a canonical link tag from an absolute canonical URL.
Open →hreflang tag generator
Generate hreflang and x-default tags from language-code and URL pairs.
Open →robots.txt generator
Build a robots.txt file from user-agent, allow, disallow, and sitemap settings.
Open →XML sitemap generator
Generate an XML sitemap from URLs with optional lastmod, changefreq, and priority.
Open →JSON-LD formatter / basic validator
Format or minify JSON-LD and check basic @context and @type structure.
Open →Wi-Fi QR code generator
Create a Wi-Fi connection QR code from SSID, security type, and password.
Open →Image collage maker
Combine multiple images into a grid with adjustable columns, gaps, and background.
Open →Image diff heatmap
Visualize pixel differences between two images as a heatmap.
Open →Image sepia / tone adjuster
Apply sepia and hue adjustments to an image and export the result.
Open →Image brightness / contrast / saturation
Adjust brightness, contrast, and saturation and export the result.
Open →Image sharpen / blur
Apply blur or lightweight sharpening to an image and export it.
Open →ID photo layout maker
Create printable multi-up ID photo layouts for common paper and photo sizes.
Open →Image contact sheet maker
Create a labeled thumbnail contact sheet from multiple images.
Open →Sprite sheet maker
Pack multiple images into a regular PNG sprite sheet.
Open →Email QR code generator
Generate a QR code that opens a prefilled email draft.
Open →Phone QR code generator
Generate a QR code for dialing a phone number.
Open →SMS QR code generator
Generate a QR code for an SMS recipient and message.
Open →Location QR code generator
Generate a QR code from latitude and longitude coordinates.
Open →Event / calendar QR code generator
Generate a QR code containing a calendar event.
Open →QR code image reader
Read the content of a QR code image in your browser.
Open →Barcode generator
Generate Code128, EAN-13, UPC-A and other barcodes in your browser.
Open →Barcode reader
Detect and read supported barcodes from an image using browser APIs.
Open →Twitter / X Card tag generator
Generate Twitter/X Card meta tags from page information.
Open →robots.txt syntax checker
Check common directives and basic syntax in a pasted robots.txt file.
Open →XML Sitemap syntax checker
Check XML syntax and basic URL entry structure in an XML sitemap.
Open →FAQ Schema generator
Generate FAQPage JSON-LD from question-and-answer pairs.
Open →Breadcrumb Schema generator
Generate BreadcrumbList JSON-LD from labels and URLs.
Open →OG image size / safe area preview
Preview recommended Open Graph image ratios and safe areas.
Open →Favicon HTML tag generator
Generate favicon, apple-touch-icon, and manifest link tags.
Open →Web App Manifest generator
Generate a PWA manifest.webmanifest file from form fields.
Open →PWA manifest validator
Validate required and recommended fields in a Web App Manifest JSON.
Open →Query string builder
Build and parse URL query strings from key-value pairs.
Open →MIME type lookup
Look up common MIME types by extension or MIME value.
Open →HTTP status code lookup
Look up HTTP status code meanings and categories.
Open →Punycode converter
Convert internationalized domain names between Unicode and Punycode.
Open →Data URI generator / parser
Generate Data URIs from text/files and parse Data URIs.
Open →Word / sentence / paragraph / reading-time counter
Count words, sentences, paragraphs, characters, and estimated reading time in real time.
Open →Full-width / half-width converter
Convert ASCII letters, numbers, symbols, and spaces between full-width and half-width forms.
Open →Unicode normalizer
Normalize text as NFC, NFD, NFKC, or NFKD and inspect differences and code points.
Open →Whitespace / newline cleaner
Clean repeated spaces, trailing whitespace, blank lines, and newlines for common text workflows.
Open →LF / CRLF line-ending converter
Convert text line endings among LF, CRLF, and CR and download the result.
Open →Extract URLs or hostnames from text
Extract URLs, hostnames, or origins from text and logs, then deduplicate and sort the results.
Use →HTML tag stripper
Strip HTML tags into plain text and optionally normalize whitespace and line breaks.
Open →Markdown to HTML converter
Convert Markdown to HTML in the browser with source output and a safe preview.
Open →PII text masker
Mask emails, phone numbers, IP addresses, and card-number-like patterns locally in the browser.
Open →Platform-dependent character checker
Detect enclosed numbers, Roman numerals, unit symbols, emoji, and other characters that may have compatibility concerns.
Open →CSV editor
Edit CSV in a browser table with type-aware sorting, row and column controls, Undo, leading-zero preservation, and UTF-8 / Shift_JIS input.
Open →CSV cleaner
Clean whitespace, blank rows, duplicates, and null markers, then remove, reorder, or rename columns with preview. Supports UTF-8 / Shift_JIS input.
Open →CSV diff / compare
Compare two CSV files by headers, rows, and cells and inspect additions, removals, and changes.
Open →CSV column reorder
Reorder CSV columns, omit unwanted columns, and optionally keep unspecified columns at the end.
Open →CSV bulk value replacer
Bulk-replace values in selected or all CSV columns using literal text or regular expressions.
Open →CSV to Markdown table
Convert CSV to a Markdown table with alignment options and escaped pipe characters.
Open →Markdown table to CSV
Parse a Markdown table into CSV and download the result.
Open →CSV key join
Join two CSV datasets by key using INNER, LEFT, or FULL join and export the result.
Open →Weekday calculator
Calculate weekday, day of year, and nearby dates with the same weekday.
Open →ISO week calculator
Calculate ISO week number, ISO week-year, and the week start/end dates.
Open →Time zone converter
Convert date/time values between IANA time zones and inspect UTC, offset, and localized output.
Open →Date / time format converter
Convert a date/time value to ISO 8601, RFC 3339, Unix seconds/milliseconds, and localized forms.
Open →iCalendar / ICS event generator
Create a downloadable ICS calendar event from title, dates, location, and description.
Open →Compound interest calculator
Calculate future value and principal/interest breakdown from rate, term, contributions, and compounding frequency.
Open →Loan payment calculator
Calculate monthly loan payment, total interest, and an amortization schedule.
Open →ROI calculator
Calculate ROI, net profit, and break-even return from investment cost and return.
Open →CAGR calculator
Calculate compound annual growth rate from starting value, ending value, and years.
Open →LTV / CAC calculator
Estimate LTV, LTV/CAC ratio, and CAC payback from ARPU, gross margin, churn, and CAC.
Open →ROAS / CPA / CPC / CTR calculator
Calculate ROAS, CPA, CPC, CTR, and conversion rate from spend, revenue, clicks, impressions, and conversions.
Open →Unit converter
Convert length, mass, temperature, area, volume, speed, and data units.
Open →Color palette generator
Generate a 9-step tint/shade palette from one color and copy CSS variables.
Open →Color harmony generator
Generate complementary, analogous, triadic, and tetradic harmonies from a base color.
Open →WCAG contrast checker
Check foreground/background contrast ratio against WCAG AA and AAA thresholds.
Open →CSS gradient generator
Build linear, radial, or conic gradients with live preview and copy-ready CSS.
Open →CSS box-shadow generator
Tune offset, blur, spread, color, and inset to generate box-shadow CSS.
Open →CSS text-shadow generator
Preview and generate CSS text-shadow values.
Open →CSS border-radius generator
Adjust four corner radii together or separately and generate CSS.
Open →Glassmorphism CSS generator
Generate glassmorphism CSS by tuning transparency, blur, border, and radius.
Open →Color mixer
Mix two colors at a chosen ratio and get HEX/RGB output.
Open →HEX8 / RGBA alpha converter
Convert between #RRGGBBAA and RGBA alpha color formats.
Open →CSS filter generator
Preview brightness, contrast, saturation, blur and more to generate CSS filter.
Open →CSS transform generator
Combine translate, rotate, scale and skew with live CSS transform preview.
Open →File SHA hash checker
Calculate SHA-1, SHA-256, SHA-384, or SHA-512 hashes locally for a file.
Open →File checksum verifier
Hash a file locally and compare it with an expected checksum.
Open →Batch file renamer
Preview batch renames with prefix, suffix, numbering, and search/replace.
Open →Filename sanitizer
Sanitize filenames by removing problematic characters and trailing dots/spaces.
Open →Multiple file size calculator
Calculate total, average, largest, and smallest sizes for selected files.
Open →File list exporter
Export selected file names, sizes, types, and modified dates as CSV or JSON.
Open →Duplicate file detector
Detect byte-identical duplicate files by grouping SHA-256 hashes.
Open →File type inspector
Inspect common magic bytes and compare detected type with extension and MIME.
Open →Date range list generator
Generate a list of dates from a start, end, and interval.
Open →Recurring date generator
Generate recurring dates by day, week, month, or year from a start date.
Open →Deadline date calculator
Calculate a deadline after a number of calendar days or weekdays.
Open →Multi-time-zone meeting finder
Find meeting times that fall inside working hours for multiple UTC offsets.
Open →Savings goal calculator
Estimate time to reach a savings goal from current balance, monthly saving, and return.
Open →Break-even units calculator
Calculate break-even units and revenue from fixed cost, price, and variable cost.
Open →Tip and bill split calculator
Calculate tip, total bill, and per-person amount for a group.
Open →Price change percentage calculator
Calculate absolute change, percentage change, and multiple between old and new prices.
Open →ISBN-10 / ISBN-13 validator
Validate ISBN-10 and ISBN-13 length and check digits.
Open →ISBN-10 ⇄ ISBN-13 converter
Convert 978-based ISBNs between ISBN-10 and ISBN-13 and recalculate check digits.
Open →JSON flattener
Flatten nested JSON into dot-separated key paths.
Open →JSON unflattener
Rebuild nested JSON from dot-separated flat keys.
Open →JSON to TypeScript interface
Infer TypeScript interfaces/types from a JSON sample.
Open →JSON Pointer tester
Resolve values in JSON with RFC 6901 JSON Pointer.
Open →CSV to XML converter
Convert CSV rows and columns into XML in the browser.
Open →XML to CSV converter
Convert repeated XML elements into tabular CSV.
Open →XML to JSON converter
Convert XML to JSON while preserving attributes and text.
Open →JSON to XML converter
Convert JSON into XML with a custom root element.
Open →URI component encoder / decoder
Encode or decode URI components in the browser.
Open →Bulk UUID v4 / v7 generator
Generate 1–1000 UUID v4 or v7 values with selectable output formatting.
Open →Random string generator
Generate random strings with configurable length, count, and character sets.
Open →JWT expiry checker
Decode JWT exp, nbf, and iat claims and inspect time validity.
Open →CSP header builder
Build a Content-Security-Policy header from common directives.
Open →Permissions-Policy builder
Build a Permissions-Policy header for browser features.
Open →Cache-Control header builder
Build Cache-Control directives including max-age and immutable.
Open →CORS header builder
Build example CORS response headers from origin and method settings.
Open →Referrer-Policy builder
Choose and generate a Referrer-Policy header.
Open →security.txt generator
Generate security.txt fields for RFC 9116 deployment.
Open →.htaccess redirect generator
Generate Apache .htaccess 301/302 redirect rules.
Open →nginx redirect generator
Generate nginx 301/302 redirect rules.
Open →chmod permission calculator
Convert three-digit chmod values to rwx permission notation.
Open →Semantic version comparator
Compare two Semantic Version 2.0.0 values.
Open →Relative URL resolver
Resolve a relative URL against a base URL using browser URL rules.
Open →SRI hash generator
Generate sha256/384/512 Subresource Integrity hashes for text or files.
Open →N-gram frequency counter
Count word or character N-gram frequencies in text.
Open →Text frequency counter
Count word, character, or line frequencies and shares.
Open →Line number add / remove
Add line numbers to text or remove existing line-number prefixes.
Open →CSV transpose
Transpose CSV rows and columns.
Open →CSV group & aggregate
Group CSV by a key column and calculate count, sum, average, min, or max.
Open →ISSN validator
Validate ISSN format and check digit.
Open →Funnel conversion calculator
Calculate stage and overall conversion rates from visitors, leads, and customers.
Use →Churn rate calculator
Calculate customer churn rate from starting customers and customers lost.
Use →Customer retention rate calculator
Calculate customer retention from starting, ending, and newly acquired customers.
Use →Average order value calculator
Calculate average order value from revenue and order count.
Use →ARPU calculator
Calculate average revenue per user from revenue and active users.
Use →CAC payback period calculator
Estimate CAC payback months from acquisition cost, monthly ARPU, and gross margin.
Use →Ad copy length checker
Count characters and words in ad copy against a custom length limit.
Use →Social post length checker
Check post length plus URL, hashtag, and mention counts.
Use →Cash runway calculator
Estimate how many months cash will last from current cash and monthly net burn.
Use →Burn rate calculator
Calculate average monthly burn rate from beginning and ending cash balances.
Use →Inventory turnover calculator
Calculate inventory turnover and days in inventory from COGS and average inventory.
Use →Reorder point calculator
Calculate reorder point from daily demand, lead time, and safety stock.
Use →Safety stock calculator
Estimate safety stock from maximum and average demand and lead times.
Use →EOQ calculator
Calculate economic order quantity from annual demand, order cost, and holding cost.
Use →Straight-line depreciation calculator
Calculate annual straight-line depreciation from cost, salvage value, and useful life.
Use →Commission calculator
Calculate commission and total compensation from sales, rate, and base pay.
Use →Salary to hourly converter
Convert annual salary into monthly, weekly, daily, and hourly equivalents.
Use →Overtime pay calculator
Calculate regular and overtime pay from hours, hourly rate, and overtime multiplier.
Use →Revenue growth calculator
Calculate revenue change and growth rate between two periods.
Use →Break-even revenue calculator
Calculate break-even revenue from fixed costs and contribution margin ratio.
Use →HTTP header parser
Parse raw HTTP headers into names and values and flag duplicate fields.
Use →Cookie header parser
Parse a Cookie header into key-value pairs with optional URL decoding.
Use →dotenv parser
Parse KEY=VALUE dotenv text, validate variable names, and convert it to JSON.
Use →Authorization header builder
Build Basic or Bearer Authorization headers locally in your browser.
Use →Regex escape tool
Escape plain text so it can be safely used as a regex literal.
Use →SQL IN list builder
Build a SQL IN (...) list from one value per line.
Use →Natural sort lines
Sort lines naturally so file2 comes before file10.
Use →List chunker
Split a line-based list into groups of a chosen size.
Use →Fixed-width text wrapper
Wrap text near a chosen character width for easier copying and reuse.
Use →Delimited text column aligner
Align delimited text into padded columns for monospaced display.
Use →CSS specificity calculator
Calculate CSS selector specificity as ID, class/attribute/pseudo-class, and element components.
Use →CSS unit converter
Convert px, rem, em, vw, and vh using configurable font and viewport dimensions.
Use →HTTP Date converter
Convert dates between HTTP Date (RFC 7231), ISO 8601, and Unix seconds.
Use →IP address validator & normalizer
Validate and normalize IPv4/IPv6 addresses and identify common special-purpose ranges.
Use →MAC address formatter & validator
Validate a MAC address and format it with colons, hyphens, or Cisco-style dots.
Use →UUID validator / version inspector
Validate UUID format, version and variant, and inspect the embedded time in v7.
Use →ULID generator
Generate sortable 26-character ULIDs locally in your browser.
Use →cURL to fetch converter
Convert a common curl command into browser fetch() code.
Use →fetch to cURL builder
Build a reusable curl command from URL, HTTP method, headers, and request body.
Use →Accept-Language parser
Parse an Accept-Language header into language tags and q-values sorted by preference.
Use →CSV row sorter
Sort CSV rows by a selected column as text or numbers in ascending or descending order.
Use →CSV distinct values extractor
Extract distinct values and occurrence counts from a selected CSV column.
Use →CSV missing-value analyzer
Count blank, NULL, NA, and other common missing-value markers by CSV column.
Use →CSV numeric statistics
Calculate count, sum, mean, median, min, max, and standard deviation for a numeric CSV column.
Use →CSV pivot table
Create a simple SUM or COUNT pivot table from row, column, and value fields.
Use →CSV column type profiler
Infer integer, number, boolean, date, or string types for each CSV column and show blank rates.
Use →CSV random sampler
Randomly sample rows without replacement from CSV, with an optional deterministic seed.
Use →CSV to SQL INSERT generator
Generate SQL INSERT statements from CSV headers and rows.
Use →List union
Combine two line-based lists into a deduplicated union.
Use →List symmetric difference
Extract items that appear in exactly one of two line-based lists.
Use →List Cartesian product
Generate every pairwise combination (Cartesian product) from two line-based lists with a configurable separator.
Use →Text indent/dedent tool
Indent or dedent multiline text using spaces or tabs.
Use →MRR calculator
Calculate ending MRR from starting MRR, new, expansion, contraction, and churned MRR.
Use →ARR calculator
Convert MRR to ARR and optionally calculate annual recurring-revenue growth.
Use →Net revenue retention calculator
Calculate net revenue retention from starting MRR, expansion, contraction, and churned MRR.
Use →Email campaign metrics calculator
Calculate open rate, CTR, CTOR, and unsubscribe rate from email-campaign counts.
Use →A/B conversion uplift calculator
Compare A/B conversion rates, absolute difference, relative uplift, and an approximate two-proportion z-test.
Use →Budget pacing calculator
Calculate ideal spend, pacing ratio, and required daily spend from campaign budget and elapsed days.
Use →Date range overlap checker
Check whether two date ranges overlap and calculate the overlapping dates and duration.
Use →Time slot generator
Generate appointment time slots from start/end times, slot duration, and interval.
Use →PDF blank page inserter
Insert blank pages at specified positions in a PDF and choose the blank-page size.
Open →PDF interleaver
Interleave two PDFs page by page, such as A1, B1, A2, B2.
Open →PDF N-up imposition
Place multiple PDF pages on each output sheet in 2-up, 4-up, 6-up, or 9-up layouts.
Open →PDF form flattener
Flatten PDF form fields into fixed page content for easier sharing and archiving.
Open →PDF form field inspector
List PDF form field names, types, values, and required/read-only states.
Open →PDF link extractor
Extract URL link annotations from a PDF with page numbers and export them as CSV.
Open →Image padding and border maker
Add padding and borders around an image and export as PNG, JPEG, or WebP.
Open →Image background color replacer
Replace pixels near a chosen source color with another color to change a simple background.
Open →Image alpha channel checker
Inspect transparent, semi-transparent, and opaque pixel ratios and the visible-content bounds.
Open →Color vision deficiency simulator
Preview an image with approximate protanopia, deuteranopia, tritanopia, or achromatopsia simulation.
Open →Image posterize tool
Reduce color levels to create a posterized image effect.
Open →Image threshold binarizer
Convert an image to black and white using a configurable threshold, with optional inversion.
Open →Image histogram analyzer
Analyze RGB and luminance histograms plus basic pixel statistics in the browser.
Open →Image RGB and alpha channel splitter
Split an image into separate red, green, blue, and alpha channel images.
Open →YAML formatter and validator
Validate and format YAML, with an optional JSON preview.
Open →INI to JSON converter
Convert between INI configuration text and JSON while preserving sections and key/value pairs.
Open →JSON Merge Patch tool
Apply an RFC 7396 JSON Merge Patch to a target JSON document.
Open →JSON array sort by key
Sort a JSON array by a selected key path in ascending or descending order.
Open →Content-Type parser
Parse a Content-Type header into media type, charset, boundary, and other parameters.
Open →Accept header parser
Parse an HTTP Accept header into media ranges and q-values sorted by preference.
Open →Content-Disposition parser
Parse a Content-Disposition header into disposition, name, filename, and filename* parameters.
Open →URL query parameter sorter
Sort URL query parameters by key/value and optionally remove common tracking parameters.
Open →HTML table to CSV converter
Extract an HTML table and convert it to CSV.
Open →CSV column renamer
Rename CSV headers in bulk using a mapping or a replacement header list.
Open →CSV deduplicate by key
Remove duplicate CSV rows by selected key columns, keeping the first or last occurrence.
Open →CSV split by column value
Split a CSV into separate files for each distinct value in a selected column.
Open →CSV header normalizer
Normalize CSV headers to snake_case, camelCase, kebab-case, or safe identifier forms.
Open →CSV outlier detector
Detect outliers in a numeric CSV column using IQR or z-score and extract flagged rows.
Open →CSV percentile calculator
Calculate requested percentiles such as P25, median, P90, and P95 from a numeric CSV column.
Open →CSV empty column remover
Detect and remove CSV columns that are blank across all data rows.
Open →Folder structure viewer
Export a selected folder structure as text, Markdown, or JSON.
Open →Folder compare tool
Compare two folders by relative path, size, and modified time and export differences.
Open →File extension summary
Summarize file counts and total size by extension in a selected folder.
Open →File size distribution analyzer
Analyze file-size buckets and list the largest files in a folder.
Open →File last-modified analyzer
Analyze last-modified dates, age buckets, oldest and newest files.
Open →Bandwidth requirement calculator
Calculate required Mbps and MB/s from data size and target completion time.
Open →Chunk upload planner
Plan chunked uploads from file size, chunk size, bandwidth, and parallelism.
Open →Checksum manifest generator
Generate a SHA checksum manifest for multiple files or a folder.
Open →Base64URL encoder / decoder
Convert UTF-8 text to and from URL-safe Base64.
Open →PKCE verifier / challenge generator
Generate OAuth 2.0 PKCE code_verifier and S256 code_challenge locally.
Open →URL normalizer
Normalize URLs, remove common tracking parameters, and sort query parameters.
Open →NDJSON / JSON array converter
Convert between newline-delimited JSON (NDJSON/JSONL) and JSON arrays.
Open →URL query parameter diff
Compare query parameters between two URLs and identify additions, removals, and changes.
Open →HTTP cache freshness calculator
Estimate HTTP cache freshness remaining from Date, Age, and max-age.
Open →SQL test data generator
Generate batches of SQL INSERT statements from simple column type definitions.
Open →PDF page compare / diff heatmap
Compare matching PDF pages and render a pixel-difference heatmap with metrics.
Open →Excel ⇄ CSV converter
Convert a selected Excel sheet to CSV, or UTF-8 / Shift_JIS CSV to Excel, with preview, delimiter and BOM options, and leading-zero preservation.
Open →CSV date column normalizer
Normalize a CSV date column to YYYY-MM-DD and report rows that could not be converted.
Open →CSV key uniqueness checker
Check uniqueness of a CSV key column and list duplicate keys with row numbers.
Open →CSV calculated column tool
Calculate two numeric CSV columns and append the result as a new column.
Open →CSV top N per group
Extract the top N rows by a numeric value within each CSV group.
Open →CSV missing value filler
Fill missing CSV values using a constant, mean, median, or forward fill.
Open →Line length analyzer
Analyze line lengths and identify lines exceeding a chosen character threshold.
Open →Character set analyzer
Count ASCII, Hiragana, Katakana, Han, emoji, whitespace, and other characters.
Open →Delimiter / list converter
Convert lists among comma, tab, semicolon, pipe, and newline delimiters.
Open →Email list cleaner
Extract, normalize, basically validate, and deduplicate a list of email addresses.
Open →Days inventory on hand calculator
Calculate days inventory on hand and inventory turns from average inventory and COGS.
Open →Cash conversion cycle calculator
Calculate the cash conversion cycle from DIO, DSO, and DPO.
Open →Booklet imposition page order generator
Generate front/back saddle-stitch booklet page order for a multiple-of-four page count.
Open →DOI normalizer / link builder
Normalize DOI strings or doi.org URLs and generate standard and Markdown links.
Open →No matches. Try a shorter term or another expression.
Browse 12 topics
Date, business day & time tools25 →File, storage & transfer23 →E-commerce import tools49 →Publishing & event tools25 →Color & CSS design18 →CSV & data tools42 →Business & everyday calculators37 →Image & print tools84 →Web developer tools138 →Marketing & CRM tools27 →Text & list tools37 →Random pickers & generators16 →