CSV CHECK

Check Klaviyo Historical Event CSV Import Errors

Check Timestamp, Email, ID, and $event_id fields before importing historical events.

Check CSV

＋Choose a CSV fileTap or click to choose. Drag & drop also works on desktop.

🔒 Analysis runs in your browser. The CSV file itself is not uploaded to BlueprintLab.

What this tool checks

Checks the 50 MB limit, Timestamp, Person//Email / Person//ID, email format, $event_id for duplicate timestamps, and numeric $value.

How to use this tool

Validate Timestamp, Person//Email / ID and $event_id before import.

Use Try sample to inspect the included sample.
Set ＋ Choose a CSV file Tap or click to choose. Drag & drop also works on desktop..
Use Check CSV to process the input.
Compare the result with your source data and return to the input to make corrections.

＋ Choose a CSV file Tap or click to choose. Drag & drop also works on desktop.: .csv,text/csv

Input and settings example

Person//Email,Timestamp,$event_id,$value,Item
john@example.com,2026-08-01 10:30:00,order-1001,49.00,Starter Kit