# 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.

**URL:** https://convertto.tech/t/data-anonymiser
**Category:** Data & Format Tools (https://convertto.tech/c/data-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **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

## How to use

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

## FAQ

### 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.

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