CSV Validator

Check whether a CSV file is really valid: unclosed quotes, rows with the wrong number of columns, duplicate headers. Runs in your browser.

CSV to check

Everything runs in your browser — the file is never uploaded. Parsing follows RFC 4180, so a line break inside quotes stays inside the cell.

Paste a CSV on the left (or open a file) and press Check.

How it works

  1. 1.Paste the CSV or TSV text, or open a file — parsing follows RFC 4180, so a line break inside quotes stays inside the cell.
  2. 2.Switch the delimiter if it is not a comma (tab, semicolon or pipe).
  3. 3.Press Check the file: unclosed quotes, rows with the wrong column count, duplicate or empty header names, a byte order mark and mixed line endings are each reported.
  4. 4.Read the preview to see how the parser really reads the file before you import it somewhere else.

Frequently asked questions

Do I get free credits to try CSV Validator?
Yes — new accounts get 3 free credits to spend on any tool, CSV Validator included. After that you only pay for what you run.
How many credits does CSV Validator cost?
Everything runs in your browser and nothing is uploaded: free accounts pay 1 credit per run, and Pro or Pro+ members run it as often as they like.
Is the content I paste private?
CSV Validator uses your input only to generate the result. Stored results are deleted automatically by our retention policy, and you can remove any run from your history.
Do I need to install anything?
No. CSV Validator works in any modern browser — nothing to download or install.