Put the real names back into an AI's answer
If you coded your text in this tab, paste the AI's answer in the Restore tab below: every code such as NAME-001 becomes the real value again, on your screen only. It works on text and on the Word, Excel or CSV files the AI produced. Starting fresh? Code your text first in the Text tab.
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.
Restoring is the step people forget
Pseudonymizing is only half the job. The AI answers with codes, and someone has to turn NAME-001 back into a client's name without retyping it, and without pasting the real names back into the AI. Restoring happens here, in your browser, with the key created when you coded the text.
- Same tab, same key. The key exists only in this tab's memory. Code, go to the AI in another tab, and come back here with the answer.
- Codes the AI altered. If the AI wrote
Name-001or split a code, the tool counts the codes it could not restore so you can fix them by hand. - Files too. A Word document or a spreadsheet written by the AI with codes is restored in place, formatting kept, under a generic file name.
Never paste the restored answer back into the AI: it would then contain the real names. Keep working on the coded version and restore again.
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
Can I restore an answer from yesterday?
Not with the free tool: the key disappears when the tab closes. The Hidden Tokens app keeps one key per case file on your computer, so any answer can be restored later.
What if I coded my text on another page of this site?
Each page has its own tab and therefore its own key. Restore in the tab where you coded the text.
Does it work with answers from any AI?
Yes: ChatGPT, Claude, Gemini, Copilot or any other. Only the codes matter.
Is anything sent when I restore?
No. Restoring happens in this tab; the page forbids any connection.
Other ways to use the free tool
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.