Anonymize a PDF: replace names with consistent placeholders

Black boxes hide who did what. Pseudonymize mode swaps every person, company and address for a tag such as [Person 1] or [Org 2], the same tag everywhere in the document, so a colleague, an expert or an AI can still follow the story. Layout preserved, output flattened, processed in the EU and Switzerland.

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Redacting: Person names, Emails, Phone numbers, Addresses, Credit card numbers

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To anonymize a PDF and keep it readable, upload it to Redact PDF AI, choose Pseudonymize, review the entities found and download. Each person, company or address becomes a coloured box with a consistent tag ([Person 1], [Org 1]) on every page, the layout stays the same, and the output is flattened so the original names cannot be recovered.

What changes in the document

Original

Anna Keller, residing at 12 Rue du Lac, Geneva, sold the vehicle to Bella Moreau on 3 March. Ms Keller informed Moreau SA the next day.

Pseudonymized

[Person 1], residing at [Address 1], sold the vehicle to [Person 2] on [Date 1]. [Person 1] informed [Org 1] the next day.

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The reader can still tell who sold, who bought and who was told. Nothing in the file identifies them.

How to anonymize a PDF in 4 steps

  1. 1

    Upload the PDF

    Drop a PDF, JPG or PNG in the box above. Scanned files work: built-in OCR reads them first. Files travel over TLS and are processed on EU and Swiss-hosted Azure infrastructure.

  2. 2

    Choose Pseudonymize

    Pick the categories to replace (people, organizations, addresses, emails, phone numbers, dates, IBANs, card numbers). The AI groups every mention of the same entity, so "Anna Keller", "Ms Keller" and "A. Keller" all become [Person 1].

  3. 3

    Review the tags

    In the Studio editor you can rename any tag: [Person 1] can become [Seller], [Client] or a fictitious name, and the change applies to every occurrence. You can also remove a false positive, add a term the AI missed, or switch a box back to a black redaction for data the reader should never see, such as an IBAN.

  4. 4

    Download the anonymized PDF

    Export a flattened copy with the tags burned in, plus the correspondence table (tag → original) to keep on your side if you need to restore the names later.

Redact or pseudonymize: which one do you need?

Both remove the personal data from the file. The difference is what the reader is left with: a black box tells them nothing, a tag tells them it is the same person as on page 2.

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Redact (black box)

  • Court filings and public disclosures
  • FOIA and subject-access responses
  • Documents where even the number of people involved is sensitive

Pseudonymize ([Person 1], [Person 2]…)

  • Asking ChatGPT, Claude or Mistral to summarize or draft from a file
  • Sending a case file to an expert, co-counsel or translator
  • Training material, case studies and anonymized decisions

Need black-box redaction instead? Redact a PDF online

Why not just ask ChatGPT to anonymize it?

Because by then the document has already left your hands with the names in it. Pseudonymizing first means the AI only ever sees [Person 1] and [Org 1], while the context it needs (who owes whom, which clause applies to which party) stays intact. Redact PDF AI processes files in the EU and Switzerland, deletes them automatically and never uses them to train AI models.

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What gets replaced, and with which tag

Every category has its own tag word, in the language of the document, numbered in order of first appearance across the whole document, not page by page. Each person or company also gets its own colour.

  • [Person 1]People, including initials and signature blocks
  • [Org 1]Organizations and company names
  • [Address 1]Postal addresses
  • [Email 1]Email addresses
  • [Phone 1]Phone numbers
  • [Date 1]Dates, including dates of birth
  • [Account 1]IBANs and bank account numbers
  • [Card 1]Credit and debit card numbers

How the main ways to anonymize a document compare

There are four common approaches. They differ on two things lawyers care about: whether the document stays readable, and whether the names ever leave your hands.

Redact PDF AI (pseudonymize)Black-box PDF redactorText anonymizer (copy-paste)Asking the chatbot
Reader can follow who is whoYes, consistent tagsNoYesUsually
Your own labels ([Seller], fictitious names)Yes, rename any tagNoDepends on the toolIf you ask, not always consistent
Original layout keptYes, same PDF pagesYesNo, plain textNo
Scanned PDFs and photosYes, OCR built inDepends on the toolRarelyDepends
Names leave your hands before anonymizationNo, only to an EU/Swiss processor that deletes themDepends on the toolDepends on the toolYes, the chatbot sees them
Names recoverable from the output fileNo, flattenedOnly if not properly flattenedNoNo

Frequently asked questions

Is pseudonymization the same as anonymization?

Not under the GDPR. Pseudonymized data can be linked back to a person with extra information, such as the correspondence table, so it is still personal data for whoever holds that table. Anonymized data cannot be linked back by anyone. The Court of Justice has accepted (C-413/23 P, 2025) that for a recipient with no reasonable means of re-identifying anyone, it may not be personal data. A pseudonymized PDF sent without its table can therefore be anonymous for its recipient, provided nothing else in the text identifies the people.

Why tags like [Person 1] rather than initials?

Initials leak information and collide: Anna and Alex both become A. A numbered tag is unique per entity and reveals nothing, and it stays the same on every page, which is what an AI or a reader needs to follow the document.

Can I choose my own labels instead of [Person 1]?

Yes. Rename any tag in the editor and every occurrence follows: use roles ([Seller], [Buyer], [Landlord]), fictitious names, or your own convention for companies ([Bank], [Employer]). Role labels give an AI the most context. If you use names, pick obviously fictitious ones and never the person’s real first name, which would reveal part of the identity.

Can I restore the original names later?

Yes, with the correspondence table you download alongside the PDF. It stays with you; we do not need it and it is deleted with the document.

Does it work on scanned PDFs?

Yes. Built-in OCR reads scans, faxes and phone photos in more than 100 languages before the AI looks for names, so a scanned judgment is pseudonymized like a digital one.

Can I anonymize a Word document?

Export it to PDF first (File → Save as PDF), then upload it. You get a pseudonymized PDF with the same layout as your Word file.

Is a pseudonymized document safe to send to an AI?

It removes the direct identifiers, which is what professional secrecy and the GDPR care about most. Still read it once: a rare job title or a unique event described in the text can identify someone on its own, and you can black out those passages in the same pass.

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