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CSV Data Anonymiser

Mask, hash or replace personal data in a CSV so it can be shared safely.

A data anonymiser replaces personal information in a CSV so the file can be shared for testing or analysis. Choose masking to keep the shape of each value, hashing for a consistent pseudonym, realistic fake replacements, or full redaction — with columns detected automatically from their names.

Runs in your browser
Runs locally
The data never leaves your browser — which is the point, for a privacy tool
Consistent
The same input value always maps to the same replacement, so counts and joins survive
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Is the result truly anonymous?

No. Consistent replacement is pseudonymisation, which GDPR still treats as personal data, because anyone holding the mapping or a matching external dataset can reverse it. Genuine anonymisation requires removing enough information that re-identification is impossible — usually including aggregation or generalisation, not just replacement.

How to use the csv data anonymiser

  1. 1Enter or paste your csv.
  2. 2Enter or paste your columns to anonymise.
  3. 3Choose the method.
  4. 4Choose the delimiter.
  5. 5Enter or paste your seed.
  6. 6The result appears immediately — copy or download it.

Embed this tool

Put the working csv data anonymiser on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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