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Guide · anonymize documents before using AI

Anonymize documents before you use them with AI

Pasting a contract, a patient letter or a customer email into an AI chat tool sends every name and number in it to that service. Re-Doc replaces the personal data with realistic synthetic values first, so you can still ask the AI to summarise, translate or analyse the document, without sharing who it is about.

Upload a file, first 10 pages freeSee pricing
Example

What Re-Doc changes

Orange boxes are what Re-Doc finds on its own. Text-based files keep their layout, and each real value is swapped for a realistic synthetic one.

1. Your documentthread.txt
Email thread for summary
Support escalation
CustomerRohan Iyer
Emailrohan.iyer@outlook.com
Order IDORD-55120-IN
Phone+91 99876 22014
RequestRefund for damaged item
2. Safe to sharethread_safe.txt
Email thread for summary
Support escalation
CustomerKabir Shah
Emailkabir.shah@mail.com
Order IDORD-71834-IN
Phone+91 98123 40567
RequestRefund for damaged item
What to replacePage 2 of 3
Checklist

What to replace, and what to keep

Usually replaced

  • Names of customers, patients and staff: replaced consistently, so the AI can still follow who is who
  • Contact details: emails, phones and addresses
  • Account, order and ID numbers: same format, different values
  • Company and project names: add them with a plain-language instruction

Usually kept

  • The facts and the question you want answered
  • Dates and amounts, unless you ask to replace them
  • The structure of the document
Tip

Because names are replaced consistently, the AI's answer still makes sense. Keep the CSV change list if you need to map the answer back to real names.

How it works

Three steps

  1. STEP 1

    Upload

    PDF, Word, TXT, scan or photo, up to 50 MB. Sign in with Google; the first 10 pages are free.

  2. STEP 2

    Review

    Re-Doc highlights every change. On scans you can add or remove boxes; for any file you can describe what to keep or remove in plain words.

  3. STEP 3

    Download

    Get the safe copy in the same format you uploaded, with the layout unchanged.

QuestionsPage 3 of 3

Frequently asked questions

01Why not just delete the names?
Deleted names leave gaps, and the AI loses track of who did what. Consistent synthetic names keep the story intact while the real identities stay out.
02Does Re-Doc itself use AI?
Yes. Re-Doc uses AI models to find personal data. AI requests use zero-data-retention options where the provider supports them, documents are typically deleted within 30 days, and they are not used to train Re-Doc's own models. See the privacy policy for details.
03What if documents must never leave our machines?
Re-Doc has a local installer that runs on your own Windows machine with a single GPU. Ask the team about it on the contact page.
04Can I map the AI's answer back to the real names?
Yes. Export the change list as a CSV. It shows each original value next to its replacement, so keep it somewhere safe.
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