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Free forever ·by FMIT Institute

CSV Validator

Human-verified No sign-up required Runs in-page — no redirects

Check a CSV file before importing it. Find rows with the wrong number of fields, missing required columns, invalid numbers and duplicate keys.

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About CSV Validator Tool

Check a CSV file before importing it. Find rows with the wrong number of fields, missing required columns, invalid numbers and duplicate keys.

Check a CSV before importing it into another system. Paste your data or start with the built-in example. Choose the delimiter, specify which columns are required or numeric, and select a key column if each record should have a unique ID.

The results show the source row, column and issue, so you can find the problem in the original file. For example, a stock import can flag a duplicate item ID or a quantity entered as “pending”.

Free to use in your browser.

CSV Validator opens on the provider's site

This tool can't run inside our page, so we open it in a new tab. It's still 100% free — nothing to install.

Open CSV Validator

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What CSV Validator can do

  • Check CSV row widths and required columns
  • Flag invalid numeric values and duplicate keys
  • Review each issue by source row and column
  • Try the checks with a built-in example

Pros

  • • Free to use without signing in
  • • Exact row and column make issues easy to locate
  • • Leaves the source data intact

Cons

  • • Reports issues for you to correct in the source file
  • • Checks the rules you enter; destination-specific rules may need a separate check

CSV Validator screenshots

Frequently asked questions

What can CSV Validator check?

It checks row widths, required columns and values, numeric fields and a unique key column when you specify one.

Where do I find the problem?

The results list the original row number, column and issue.

Does it fix or import my file?

It reports issues. Edit the source data and run the check again before importing.

Is it free?

Yes. You can use it in your browser without signing in.

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