Anonymize a text before you paste it into DeepSeek
Paste your text below. Names, companies, references and phone numbers become codes such as NAME-001. Give DeepSeek the coded text, then paste its answer back in the Restore tab: the real names come back on your screen, and DeepSeek 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 payment reminder to draft
Draft a polite reminder to Fenella Strachan at Kinloch Marine Supplies Ltd: invoice INV-2026-0388 for £6,450 is 30 days overdue. Her direct line is 0131 496 0815.Draft a polite reminder to NAME-001 NAME-002 at COMPANY-001: invoice REF-001 for £6,450 is 30 days overdue. Her direct line is PHONE-001.The contact, her company, the invoice reference and the phone number are coded; the amount and the delay stay readable so the reminder can quote them.
Where your text goes when you use DeepSeek
DeepSeek's privacy policy says the information it collects is stored on servers in the People's Republic of China. Several European data protection authorities have opened inquiries into the service. Many organisations therefore restrict it; individuals often use it anyway because it is good and free.
Whatever your view, the safe habit is the same as with any AI: send it nothing that identifies a client, a colleague or yourself.
- Code here. Paste the text, press Code it and read the result.
- Ask DeepSeek on the codes. “Write a firm but polite reminder to
NAME-001 NAME-002” works as with the name. - Restore here. Paste the answer in the Restore tab and copy the version with the real names.
If your organisation forbids DeepSeek, coding does not change that rule: it protects what you send to the services you are allowed to use.
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 it safe to use DeepSeek with coded text?
Coding removes direct identifiers from what DeepSeek receives. Whether you may use the service at all is a question for your organisation's policy.
Does DeepSeek understand the codes?
Yes. Like other AIs, it keeps codes as they are when asked and reasons on who did what. If it alters a code, the Restore tab counts the codes it could not restore.
What about the open-weights versions?
DeepSeek's models can also be run on other infrastructure. This page is about the DeepSeek chat service; the same coding works with any AI you paste text into.
Is this a DeepSeek tool?
No. Hidden Tokens is independent and not affiliated with DeepSeek.
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.