Anonymize a text before you paste it into Mistral Le Chat
Paste your text below. Client names, companies, emails and phone numbers become codes such as NAME-001. Give Le Chat the coded text, then paste its answer back in the Restore tab: the real names come back on your screen, and Mistral never received them.
Restoring uses the key of this tab: code your text here first, keep this tab open, then come back with the answer.
Adjust
See the key (it stays in this tab)
The key links each code to the real value. It exists only in this tab's memory: close or reload the tab and it is gone.
connect-src 'none' in its security policy) and loads no analytics. Turn Wi-Fi off once the page has loaded: the tool works just the same. The engine is the one inside the Hidden Tokens app.How it works
1 · Code
Paste a text or drop a file. Names, companies, addresses, emails, phone numbers, bank details, ID and case numbers become codes such as NAME-001 or COMPANY-001. Unknown proper nouns are coded too: when in doubt, the engine codes.
2 · Send the codes
Copy the coded text, or download the coded file, and give it to ChatGPT, Claude, Gemini or Copilot. The AI reasons on the codes: it still knows who did what, not who they are.
3 · Restore
Paste the AI's answer in the Restore tab, in the same browser tab. The codes become the real names again, on your screen only.
Example: a request to check a supplier agreement
Hi Lea, could you check the supplier agreement with Rousselot Equipment Ltd before Friday? Their contact is Matthew Garnett, 07700 900418. Our liability cap is €40,000 and the notice period is 60 days.Hi FIRSTNAME-001, could you check the supplier agreement with COMPANY-001 before Friday? Their contact is FIRSTNAME-002 NAME-001, PHONE-001. Our liability cap is €40,000 and the notice period is 60 days.The colleague, the supplier and its contact are coded; the liability cap and the notice period stay readable, because they are what Le Chat has to check.
A European provider changes the law, not the transfer
Mistral AI is a French company, and many organisations choose Le Chat for that reason: the provider is in the EU and the GDPR applies to it directly. That is a real difference in who answers to which regulator. It does not change the basic fact: what you paste is received and processed by the provider, under its terms and your plan's settings.
Coding first makes the question simpler. If Le Chat receives COMPANY-001 instead of your supplier's name, the provider's location matters much less for that message.
- Code here. Paste the text, press Code it and read the result.
- Ask Le Chat on the codes. “Is the liability cap in
COMPANY-001's agreement market standard?” works as with the name. - Restore here. Paste the answer in the Restore tab of this browser tab.
The Hidden Tokens browser extension does the same inside Le Chat, ChatGPT, Claude, Gemini, Copilot, Perplexity and DeepSeek, for people who use them every day.
The free tool or the Hidden Tokens app?
This free tool
- One text or one file at a time
- Up to 3,000 words or 1,000 spreadsheet rows
- The key lives in this tab and disappears when you close it
- Word, Excel, CSV and text
The Hidden Tokens app
- Whole folders: the same person keeps the same code in every document
- One key per case file, kept on your computer
- PDF and scanned documents, read on your computer
- Inside Claude Desktop, and in ChatGPT, Gemini and Copilot with the extension
- Industry packs, firm rules and a signed proof of what the AI saw
A word on the word “anonymize”
Strictly speaking, this tool pseudonymizes: each value is replaced by a code that can be reversed with the key. Under the GDPR, pseudonymised data is still personal data for whoever holds the key, which here is you, in this tab. What the AI receives no longer names anyone directly. Clues can remain, such as a job, a town and an age together: the tool warns you when it sees them. Read the result before sending it.
Questions
Is Mistral safer than US providers?
It is subject to EU law as a European company, which matters for some organisations. It still receives what you send. Coding removes the names whichever provider you choose.
Does Le Chat understand coded French text?
Yes. On the French page codes look like NOM-001; Le Chat reasons on them like any other AI. Dates and amounts stay readable.
Can I upload a coded file to Le Chat?
Yes. Use the Word or Excel tab to get a coded copy with a generic file name, then upload that copy.
Is this a Mistral tool?
No. Hidden Tokens is independent and not affiliated with Mistral AI.
Other ways to use the free tool
By file type
By AI tool
By task
For whole folders, use the app
Hidden Tokens codes whole case files on your computer with one key, works inside Claude Desktop and in your browser, reads PDFs and scans, and puts the real names back into Word and Excel files.