Mask private details
before using any AI

PHI patterns automatically masked in ChatGPT, Claude, and more.

  • 100% local masking. We never see or store your documents.
  • PHI Mask uses pattern matching. No AI.
  • Free 14-day trial. No account required.

Pattern matching, right in your browser

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.

Private details are hidden from AI

Names, dates, and identifiers are found in your browser by plain pattern-matching software · no LLM or generative AI.

Paste or upload as usual

Use ChatGPT, Claude, or other AI websites.

You see the originals.
AI sees the masks.

The AI receives [name:EC], not Emily Carter. Only your browser will know and restore [name:EC] back to Emily Carter.

Choose the right PHI Mask plan

Billing periodSave 60%

Personal use

Personal

For personal use or evaluation.

$0 USD/ month

  • Browser extension · mask as you paste or upload
  • Text, screenshots, PDFs, and files
  • Unlimited documents · no per-document or per-page fees
  • Works offline in your browser · nothing uploaded

Organization-wide use

Enterprise

For organizations with procurement or deployment requirements.

  • Everything in Professional
  • Unlimited members
  • Granular roles and permissions
  • Dedicated support
  • Data residency and air-gapped review
For licensed professionals

What's the ROI on protecting your license?

Staff are already using unapproved AI tools.* Client data in a prompt puts your license at risk. PHI Mask masks private details at the moment of paste or file upload, before they can reach ChatGPT, Claude, or AI websites.

Request a demo →
  • More than 1 in 3

    professionals admit using AI tools their organization hasn't approved or can't see.*

  • One rushed prompt

    puts client or patient data at risk.

  • Protect your license

    Keep private details out of ChatGPT, Claude, and AI.

* Thomson Reuters, Future of Professionals 2026

See it work in your browser

The same masking runs online. Watch the example below, then try your own.

Mask PHI and PII in PDFs, screenshots, and text

Find names, addresses, dates, and identifiers before sharing with ChatGPT, Claude, or anyone.

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

Common questions

Your data

Does PHI Mask store my documents or files?

No. PHI Mask does not receive, store, or log the documents and text you mask. Detection and masking run locally in your browser. See the Data Usage Policy.

Where is my data processed and stored?

Your files and text are processed in your browser, in whatever country you are working in. They are never sent to us and never stored by us.

Does PHI Mask use an LLM or generative AI?

No. Masking uses no LLM and no generative AI. Detection and masking run in your browser, and your text and files are not sent to a model provider by PHI Mask.

How masking works

Does PHI Mask read handwriting?

Only on a best-effort basis, and it misses a lot. Some handwritten entries are masked and others pass through untouched, even when the printed fields around them masked normally. Treat every handwritten entry as unmasked until you have checked it, and select anything still showing to mask it.

Can I get the real values back?

Yes. The masked content is reversible and is mapped back to your real values in your browser.

HIPAA

Is PHI Mask HIPAA compliant?

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.

Do I need a Business Associate Agreement (BAA) with PHI Mask?

A business associate agreement (BAA) covers a vendor that creates, receives, maintains, or transmits protected health information for you. Your file never leaves your browser, so we hold none of it and there is nothing to sign.

Does masking make a document de-identified under HIPAA?

Not by itself. Safe Harbor de-identification requires every one of the eighteen identifier types to be gone, and expert determination is a separate formal route. PHI Mask finds what it can and shows you the result. Your review is still needed. Handwriting is read only on a best-effort basis, so check those fields yourself.

What about the assistant I send the masked copy to?

Sending a masked copy is still a disclosure to whoever receives it. Anything the mask missed travels with the file. Check the terms of the tool you paste into and whether your organization needs its own agreement with that vendor. That is a separate question from PHI Mask.

What if I already pasted patient information into ChatGPT?

Treat it as a disclosure that already happened. Whether it has to be reported is a decision your privacy officer or your organization's process makes, not one a tool can make for you. Write down what was shared and when, delete the conversation if your account allows it, and check whether an agreement with that vendor covers the plan you were signed in to.

GDPR

Is PHI Mask GDPR compliant?

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

Do I need a data processing agreement (DPA) with PHI Mask?

A data processing agreement covers a processor that processes personal data on a controller's instructions. Your file never leaves your browser, so we process none of it and there is nothing to sign. PHIMask.com is a controller for the website and support data described in the Privacy Policy.

Is masked or redacted output anonymous under GDPR?

It depends on your Output setting. Mask leaves a placeholder you can map back to the real value, so that copy is still personal data. Redact removes the value from the exported copy for good, so there is nothing to map back. Neither setting makes the whole copy anonymous. That bar is whether anyone who might reasonably try can still get back to the person, and it turns on what else the copy shows.

PIPEDA, PHIPA, and Law 25

Is PHI Mask PIPEDA compliant?

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

Do I need an agreement with PHI Mask under PIPEDA?

No. PIPEDA asks for a contract when you hand personal information to a third party to process. Your file is masked in your browser and never sent to us, so you hand us none of it and there is no contract to sign. Accountability for that information stays with your organization.

Is PHI Mask PHIPA, HIA, and Quebec Law 25 compliant?

PHI Mask is PHIPA-compatible, HIA-compatible, and Law 25-compatible. Your file is masked in your browser and never sent to us, so there is no agent agreement to sign, and without a signed agent agreement we cannot claim PHIPA or HIA compliance. Nothing of yours is transferred outside Quebec, so there is nothing for Law 25 to assess and no Law 25 compliance to claim.

SOC 2 and ISO 27001

Is PHI Mask SOC 2 and ISO 27001 compliant?

PHI Mask is SOC 2-compatible and ISO 27001-compatible. Your file is masked in your browser and never sent to us, so there is no system of ours for an auditor to examine, and without an audit we cannot claim SOC 2 or ISO 27001 compliance. PHI Mask holds no SOC 2 report and no ISO/IEC 27001 certificate.

Licensing and billing

Is PHI Mask free?

Yes. Personal use and trial evaluation are free, with no account required. Professional, clinical, and client work requires a commercial license.

Can I use this for client or patient work?

Personal use is free. Any professional, clinical, or client use (for patients, clients, a firm, or a practice) requires a commercial license. To start a pilot, request access.

Is PHI Mask open source?

No. PHI Mask is commercial software: personal use is free and commercial use requires a license. We plan to publish source you can read for personal use once enterprise licensing makes that sustainable.

How does commercial billing work?

Choose monthly billing or pay annually upfront. Both are priced per user. Your Stripe invoice confirms payment but is not the seat assignment by itself, so keep the invoice number in case you need billing help.

How do I get billing help?

Use the request form for activation, seat, cancellation, refund, or invoice questions. Include the Stripe invoice number if you have one. Never send card details, PHI, or original files. use the request form.

Try PHI Mask on your next AI chat

Free 14-day trial. No account required.