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CSV CHECK

Klaviyo profile / list CSV checker

Check a Klaviyo profile or list CSV before import.

Check CSV

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

Files are processed in your browser and are not sent to our server.

What this tool checks

Checks CSV / 50 MB requirements, headers, Email or Phone Number on every row, invalid emails, and duplicate identifiers.

About this tool

Klaviyo profile / list CSV checker is a free online utility from BlueprintLab Tools. Check identifiers, duplicates and the 50 MB limit before list import.

Designed for small marketing and CRM tasks such as preflight checks before importing campaign or customer data.

No account is required. The tool is designed to complete the task directly in your browser with a short input → process → result flow.

How to use

  1. Enter or choose ＋ choose a csv file tap or click to choose. drag & drop also works on desktop..
  2. Enter the required values.
  3. Run the tool and review, copy, or use the result.

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