Dikke Stift

Anonymize text and pdfs, free and secure

Paste text or upload a pdf: Dikke Stift flags sensitive info, you check it, and get a free, secure anonymous version back.

Your text stays in your browser on your computer. Nothing is sent, stored or shared.

sensitivity
lownormalhigh

Low, plus names, addresses and company names from the sentence.

This mode finds the most, but also marks things that aren't sensitive. Give it a quick check.

language of the text
 

Drag a file here, or

Supported files: .docx, .pdf, .txt and .md

Tip: Got a pdf? Turn it into markdown. PDF to markdown

How your text stays private

Nothing leaves your browser.

Searching and replacing happens on your own computer. The text is never sent anywhere.

Nothing is stored.

There's no account, no database and no log file with your text in it. Close the tab and it's all gone.

No cookies, no one watching.

There's no advertising code on this page and nothing is tracked about what you paste.

Check it yourself.

Pull out your internet connection and don't refresh the page: the tool keeps working. That's only possible because nothing is sent.

Frequently asked questions

How do I anonymize a pdf?

Upload your pdf in step 1. Dikke Stift automatically flags sensitive data like names, addresses and ID numbers and redacts it right away. Review the highlights and click 'Next' to download or copy the clean text. If something got flagged that should stay visible, click ✕ to show it again. It's free and doesn't need an account.

Can I redact a pdf with black bars using Dikke Stift?

Not literally: you won't get a pdf with black bars back. Instead, Dikke Stift removes the sensitive text entirely and gives you clean, anonymous text you can use or share right away. That's often just as useful as redacting, with less work.

Is this a free pdf anonymization tool?

Yes. Dikke Stift is completely free to use, with no account, limits or watermark.

How secure is it to redact sensitive pdf content with this tool?

Very secure: your pdf and text never leave your browser. Nothing is uploaded to a server, stored or shared. Disconnect from the internet and the tool keeps working.

What sensitive information does the tool recognize automatically?

Among other things: citizen service numbers, account numbers (IBAN), email addresses, phone numbers, addresses, names, company names, and passwords or keys. Use 'My words' to add words that should always be removed.

Can I make pdf information unrecognizable before sharing it with an AI like ChatGPT or Claude?

Yes, that's exactly what Dikke Stift is built for. Anonymize the text, share it safely with an AI tool, then restore the original data in step 4 once you get the answer back.

More ways to use Dikke Stift

My words

These words are always removed, even on low.

  • No words added yet.