Anonymize the text of a PowerPoint deck before an AI reworks it
The free tool does not open .pptx files. It codes the text of your slides: copy the outline and the speaker notes, paste them below, and client names, contacts and emails become codes. Ask the AI to rewrite, shorten or restructure the deck on the coded text, then restore its answer here.
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: an account review deck, slide text and notes
Slide 1 — Q3 account review: Halvorsen Retail Group
Slide 2 — Key contact: Ingrid Halvorsen (CFO), ingrid.halvorsen@halvorsen-retail.example
Slide 3 — Revenue Q3: £1.2m, up 8% on Q2
Slide 4 — Risk: contract renewal due 31 March 2027; Ingrid Halvorsen wants a 5% discount
Speaker notes: remind the team that Liam Costigan negotiated last year's deal.Slide 1 — Q3 account review: COMPANY-001
Slide 2 — Key contact: FIRSTNAME-001 NAME-001 (CFO), EMAIL-001
Slide 3 — Revenue Q3: £1.2m, up 8% on Q2
Slide 4 — Risk: contract renewal due 31 March 2027; FIRSTNAME-001 NAME-001 wants a 5% discount
Speaker notes: remind the team that FIRSTNAME-002 NAME-002 negotiated last year's deal.Ingrid Halvorsen keeps the same code on slides 2 and 4, so the AI knows the contact and the discount request are the same person. The tool also flags that a job title such as “CFO” next to a date can point to one person: drop it if the AI does not need it.
Where names hide in a deck
Decks are made to be shared, so they are full of names: client logos and names on the title slide, contacts, quotes, the people in the speaker notes, comments from reviewers. An AI asked to “improve this deck” receives all of it.
- Copy the slide text. In PowerPoint, View → Outline View shows the text of every slide; select it all and copy. Text in images and charts is not included.
- Add the speaker notes. Notes are often more sensitive than the slides. Copy them from the notes pane, slide by slide, or paste only the ones you need.
- Code, ask, restore. Paste in the Text tab, code, and ask for the new version on the codes. Restore the answer here and put the text back into your slides.
The free tool cannot write a .pptx. The Hidden Tokens app makes a coded copy of the deck itself, layout, notes, comments and chart data included, and puts the real names back into the deck the AI builds.
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 drop a .pptx file here?
No: the free tool reads Word, Excel, CSV and text. Copy the outline and notes into the Text tab, or use the Hidden Tokens app, which codes the .pptx itself.
What about names inside charts or images?
They are not in the outline, so they are not copied, and not coded either. If you send the deck itself to an AI, check charts, images and slide masters.
Will Copilot in PowerPoint see the original anyway?
Yes, Copilot inside PowerPoint reads the open file. This tool protects what you paste into a prompt; for Copilot in the app, work on a copy whose text you have coded.
Are figures such as revenue coded?
No. Amounts and percentages stay readable so the AI can build charts and summaries. A figure alone identifies no one.
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.