PHI Mask

Mask PHI and PII in Firefox before using ChatGPT.

Paste or upload. Automatically masked.

Add to Firefox

Free 14-day trial. No account required.

  • Pattern matching in your browser
  • We never see or store your files.
Before-and-after illustration of a claim masked before upload to ChatGPT.
Pattern matching in your browserNo generative AI. No files sent to PHI Mask.

After you add it

  1. 1

    It's on right away

    Firefox opens a welcome tab that shows the PHI Mask button.

  2. 2

    Pin PHI Mask

    Pin it to your toolbar to see whether it's on.

  3. 3

    Paste as usual

    Paste or upload into ChatGPT, Claude, or Gemini. Private details are masked before you send.

What PHI Mask can see

Firefox shows these two lines when you add PHI Mask. Here is what each one means.

“Read and change your data on a number of websites”
PHI Mask runs only on the AI sites listed below, so it can mask what you paste or upload there.
“Read data you copy and paste”
It reads a paste only on those sites, to mask it before the site receives it.

Works where you paste

These are the sites it runs on today.

  • ChatGPT
  • Claude
  • Gemini
  • Google AI Studio
  • Microsoft Copilot
  • Perplexity
  • Mistral
  • DeepSeek
  • Grok
  • Poe
  • Kimi
  • Meta AI
  • Lovable
  • Replit
  • Base44
  • AI Fiesta

In their own words

  • “It's very quick, very convenient, and very easy compared to what I used to do before.”

    Dr. Nguyen, LMCCAssociate Physician, Alberta · limited practice licence
    Read transcript

    Hi, my name is Nhi Nguyen, and I'm a medical professional from Vietnam, and I'm currently working as a specialist assistant in Edmonton, Alberta.

    So every day I've been using PHI Mask to redact my patients' confidential information while processing their data.

    It's very quick, very convenient, and very easy compared to what I used to do before.

    I used to have to manually redact all the data of the patients myself, or manually go through the documents and retype everything.

    As you can see, it's a very painful process, and now I have PHI Mask, everything is just way easier.

    So I highly recommend it, and I would use it every day.

0.9 MB
text
0.3 MB
PDF text layer
4.1 MB
OCR images & scanned PDFs, English

Fully works offline in Airplane Mode

Your files never reach us.

Pattern matching finds identifiers and masks them in your browser.

Zero Data Retention. We keep no copy of your files or text, because we never receive them.

PHI Mask is HIPAA-compatible. Your file is masked in your browser and never sent to us, so there is no BAA to sign, and without a signed BAA we cannot claim HIPAA compliance.

Try PHI Mask on your next AI chat

Free 14-day trial. No account required.

Add to Firefox