Anonymize a document before sharing it with AI
More and more work runs through an AI chatbot: summarizing a contract, drafting an email based on a customer file, checking a cover letter. The problem is that those documents often contain names, addresses, account numbers, or other personal data that has no business being sent to an external AI service. Dikke Stift removes it before you paste anything in, then puts it back afterwards.
Your text stays in your browser on your own computer. Nothing is sent, stored or shared.
How to share safely with an AI assistant
- Paste your text, or upload a PDF, docx or txt file, in step 1 of the main tool.
- Dikke Stift automatically flags names, contact details, and other sensitive info.
- Review the highlights and click 'Next' for the clean text.
- Paste that clean text into ChatGPT, Claude, or another AI, and keep the tab open.
- Copy the AI's answer back into step 4 ('restore the answer') to put the original data back in place.
Who this is for
Mostly people working with confidential client, patient, or employee files who still want to use AI: lawyers, HR staff, healthcare workers, accountants. You get the speed of an AI assistant, without personal data ending up with an external party that has no reason to see it.
Tip: Got a PDF? Convert it first with the pdf to markdowntool, then paste the text here.
More ways to use Dikke Stift
Frequently asked questions about anonymizing documents for AI
Is it unsafe to paste sensitive documents into ChatGPT?
The risk is mostly about what happens after you send it: storage on the provider's side, possible use for training, or simply the fact that you're sharing something with a third party that has no reason to see it. For a quick question about a paragraph that barely matters, for a full contract or medical file it does.
Does this work with any AI chatbot?
Yes. Dikke Stift has nothing to do with which AI you use afterwards, it just gives you clean text back that you can paste into ChatGPT, Claude, Gemini, Copilot, or anything else.
How do I get the original data back afterwards?
Paste the AI's answer into step 4, 'restore the answer'. Dikke Stift recognizes where your flagged data used to be and puts it back automatically, so you don't have to fill in the final result by hand.