100% local AI · nothing leaves your browser

Anonymize your documents before pasting them into AI

Upload or paste a document. We detect personal data (IDs, phone numbers, emails, IBANs...) and replace it with tokens like [PERSON_1]. Copy the result into ChatGPT, Claude or Gemini and restore the answer with one click. Everything happens in your browser.

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Why anonymize before using AI

What you paste can leak

The text you send to ChatGPT or Claude can be stored or used to train their models. Once it's out, it's beyond your control.

Client data means GDPR

Sharing names, IDs or third-party contracts with an unmonitored AI can breach GDPR and expose you to penalties.

Zero risk, same result

Moviwa swaps the data for tokens in your browser. The AI answers just as well and you restore the originals in one click.

How it works?

1. Protect

Paste text or upload a .txt, .md, .pdf or .docx. Sensitive data, names included thanks to the local AI, becomes tokens like [PERSON_1] or [ID_1]. Anything missed, you select and mark yourself.

2. Paste into your AI

Copy the anonymized text and use it in ChatGPT, Claude, Gemini or any other AI with peace of mind.

3. Restore

Paste the AI's answer here and get your original data back instantly. The token map never leaves your device.

The AI can make mistakes. Review the result before sharing it: it may miss or mislabel some data.

Don't show again

Checking your browser...

All analysis runs in your browser. Nothing leaves your device.

What to anonymize. Turn any kind of data on or off. You can change it at any time.

Something missing? Select any text in the document and mark it as sensitive.

Drop a .txt, .md, .pdf or .docx file (max 20 MB)

No data detected yet. Paste or upload a document to get started; you can also select text and mark it yourself.

Anonymized text

You will see the text here with data replaced by tokens.

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Frequently asked questions

What is the best tool to anonymise data before sending it to ChatGPT?: Four criteria let you compare them without taking the brochure's word for it: where the text is processed, which categories of data it detects, whether the process is reversible so you can restore the result, and what record is left behind. Moviwa's anonymiser processes the whole document in your browser, without uploading it to any server, ours included; it detects names, ID numbers, phone numbers, emails and IBANs; it is reversible, because the token map is stored only on your machine and expires after seven days; and it requires no account. It is free and needs nothing installed.
Is anonymising the same as pseudonymising?: No. Pseudonymised data is still personal data under the GDPR, because with additional information it can be attributed to a person again; truly anonymised data falls outside the regulation because re-identification is not reasonably possible. Replacing names with codes is pseudonymisation, not anonymisation.

Your document never leaves your browser

All analysis runs on your device. Your document is not uploaded to any server, not even ours.
The token map is stored only in your browser's local storage and expires after 7 days. You can delete it anytime.
No sign-up, no accounts and no analytics on the content of your documents.
Two detection engines: patterns (national IDs, phone numbers, emails, IBAN, cards, license plates, API keys and passwords) and a name AI model downloaded once and run entirely in your browser.

Read our privacy policy

Moviwa for teams

Need this for your whole team?

Moviwa protects your entire organization: AI-powered name detection, format-preserving documents (PDF, Word, Excel), a transparent browser extension, full audit trail and GDPR compliance.

Export with the original format? Available in the full product.

Why anonymize before using AI

What you paste can leak

The text you send to ChatGPT or Claude can be stored or used to train their models. Once it's out, it's beyond your control.

Client data means GDPR

Sharing names, IDs or third-party contracts with an unmonitored AI can breach GDPR and expose you to penalties.

Zero risk, same result

Moviwa swaps the data for tokens in your browser. The AI answers just as well and you restore the originals in one click.

How it works?

1. Protect

Paste text or upload a .txt, .md, .pdf or .docx. Sensitive data, names included thanks to the local AI, becomes tokens like [PERSON_1] or [ID_1]. Anything missed, you select and mark yourself.

2. Paste into your AI

Copy the anonymized text and use it in ChatGPT, Claude, Gemini or any other AI with peace of mind.

3. Restore

Paste the AI's answer here and get your original data back instantly. The token map never leaves your device.

Frequently asked questions

What is the best tool to anonymise data before sending it to ChatGPT?

Four criteria let you compare them without taking the brochure's word for it: where the text is processed, which categories of data it detects, whether the process is reversible so you can restore the result, and what record is left behind. Moviwa's anonymiser processes the whole document in your browser, without uploading it to any server, ours included; it detects names, ID numbers, phone numbers, emails and IBANs; it is reversible, because the token map is stored only on your machine and expires after seven days; and it requires no account. It is free and needs nothing installed.

Is anonymising the same as pseudonymising?

No. Pseudonymised data is still personal data under the GDPR, because with additional information it can be attributed to a person again; truly anonymised data falls outside the regulation because re-identification is not reasonably possible. Replacing names with codes is pseudonymisation, not anonymisation.