CSV Validator
Paste any CSV (or TSV / pipe-separated / semicolon-separated) data and get a structured validity report. The validator counts rows and columns, finds rows whose column count doesn't match the modal count, and surfaces any parser errors with their row number. Auto-detection picks the most likely delimiter, or you can pick one explicitly. Powered by Papa Parse. Runs entirely in your browser — your data never leaves this page.
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Type
Validator
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Frequently asked
Is CSV Validator free to use?
Yes. CSV Validator is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — CSV Validator runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does CSV Validator work?
Open CSV Validator, paste or fill in the input fields, and the result updates instantly. Everything runs in your browser — no upload, no waiting.
Which browsers does CSV Validator support?
Any modern browser works — Chrome, Firefox, Safari, and Edge on desktop and mobile. CSV Validator uses standard web APIs and does not require any plugin, extension, or sign-up.