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CSV Anonymizer

Replace names, emails, phones and IDs with consistent fakes or hashes, shift dates and group ages, so data is safe to share.

Free, no uploads, no sign-up. Runs 100% in your browser.

How CSV Anonymizer works

Everything runs in your browser. Files and text are never uploaded, so the private data you are protecting never leaves your device. Columns are guessed from their headers and values. Hashing uses SHA-256 with your secret salt, so the same person gets the same stand-in across files.

Input: CSV, XLSX, ODS. Output: CSV, XLSX.

How to use CSV Anonymizer

1. Drop a spreadsheet.
2. Check the action picked for each column.
3. Set the date shift and salt.
4. Press Anonymise and download.

Tips

• Nothing is uploaded, so you can use these tools on sensitive files.
• Share passwords a different way than the file itself.
• Always check a cleaned or redacted file before you send it.

CSV Anonymizer FAQ

Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Does it work offline?

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

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