Which Tool Should You Use to Anonymize Data Before AI?

You're looking for a tool to anonymize your data before handing it to an AI. Here's the direct answer. The right tool detects sensitive data for you. It replaces it before the prompt reaches the model. It keeps the mapping on your side, to restore the answer. And it runs in your browser, so the detected values don't leave in clear text. ONYRI Sanitize is built for this. But let's set the criteria first. Then you'll choose with open eyes.

The short answer: the 4 functions of a good tool

A good tool to anonymize data before AI does four things. Here they are, in order of importance.

• It detects sensitive data on its own: names, emails, IBANs, social security numbers, API keys…
• It replaces them with tokens before the prompt leaves for the model.
• It keeps the token ↔ value mapping on your side, to restore the answer.
• It works in the browser, keeping the detected real values on your device.

Why doing it by hand fails

The manual method looks simple. You cross out names. You erase the IBAN with a marker. You strip identifiers by hand before copy-pasting. In practice, it breaks down fast.

First, it's slow. Cleaning each prompt takes time. Second, it's error-prone. You always miss one identifier. An email in a signature. A number in a table. Third, you lose the useful answer. If you erase the real values, the AI replies on nothing. You can't put your data back into its result.

The criteria of a good anonymization tool

Not all tools are equal. Here are the criteria that truly matter.

• Broad detection: names, emails, IBANs, social security numbers, API keys, technical secrets.
• Reversibility: being able to restore the real values in the AI's answer.
• Local processing: the replacement happens in the browser, not on a third-party server.
• Compatibility: the tool works with your usual models (ChatGPT, Claude, Gemini…).
• Custom rules: adding your own sensitive terms (project names, client codes).

By hand or with a dedicated tool

The table below sums up the gap. It sets manual cleaning against a tool built for AI.

How ONYRI does it

ONYRI Sanitize applies these criteria end to end. The flow takes four steps.

1. 1You paste your text or import a table into the app.
2. 2The engine detects sensitive data and replaces it with reversible tokens.
3. 3The anonymized text goes to the model; the token ↔ value mapping stays in your browser.
4. 4The answer comes back, and the app restores your real values in place, in the browser.

Two surfaces cover your uses. The web app handles text, tables and a built-in Chat tab. A browser extension grafts ONYRI directly onto major AI sites. You add your own rules for in-house terms. A Free tier serves as an entry point; advanced features belong to the paid plans.

That's the whole logic of ONYRI Sanitize. Detect, replace with reversible tokens, restore the answer. The mapping stays in your browser, never on our servers. This approach strongly reduces your data's exposure. It doesn't make it « anonymous under the GDPR »: reversible tokens are still pseudonymization. But it keeps the one thing that matters here on your device — your real values.