Does ’s appointment reminder go to her cell ?
Mask private details
before using any AI
Client and patient names, dates, and identifiers masked automatically in ChatGPT, Claude, and more.
- 100% in-browser masking. We never see or store your documents.
- No LLM or generative AI.
- Free. No account needed.
Doctor recommended
“It's very quick, very convenient, and very easy compared to what I used to do before.”
Dr. Nguyen, LMCCAssociate Physician · 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.
“I now have the tools to use AI fluently. I used to make careful maneuvers when taking pictures and screenshots. Then I would manually remove remaining patient information. I don't have to do that anymore and would definitely recommend PHI Mask to my colleagues.”
Dr. Khadija El-HammassiPsychiatrist
Pattern matching, right in your browser
PHI Mask finds names, birth dates, phone numbers, and other identifiers.
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.
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.
- 0.9 MB
- text
- 0.3 MB
- PDF text layer
- 4.1 MB
- OCR images & scanned PDFs, English
Fully works offline in Airplane Mode
Big AI keeps the chats. You carry the risk.
1 in 3. Law firm staff already use AI their firm never approved. PHI Mask masks client and patient details in the browser, before any AI site receives them.
- Your team
1 in 3
law firm staff use AI their firm never approved
Thomson Reuters Institute2026
Read the study → - Big AI
6 of 6
top US AI companies train on consumer chats by default
Stanford HAI2025
Read the study → - Your license
$2.19M
a year: the HIPAA penalty cap for each type of violation
US Dept. of Health and Human Services2026
Read the rule → - Your team
71%
of US doctors worry about patient privacy in AI tools their workplace didn't provide
American Medical Association2026
Read the survey → - Big AI
Kept
deleted ChatGPT chats, held under a court order
US District Court, S.D.N.Y.2025
Read the order → - Your license
Breach
Ontario's privacy commissioner: patient data in unapproved AI scribes is a breach
Information and Privacy Commissioner of Ontario2026
Read the finding → - Big AI
Access
authorized OpenAI staff and trusted providers may access user content for specified purposes
OpenAI2026
Read the policy → - Your license
$1M
the most an Ontario court can fine a clinic for a health privacy offence
Ontario, PHIPA s. 722020
Read the law → - Your license
$25M
or 4% of worldwide turnover, whichever is higher: Quebec's maximum base fine for a company
Quebec, Law 252021
Read the law →
Common questions
Your data
Does PHI Mask use an LLM or generative AI?
No. Masking uses no LLM and no generative AI. Your phone already underlines a phone number in a text message. PHI Mask finds names, phone numbers, and birth dates in what you paste or upload. Pattern matching is a 0.9 MB download. Detection and masking run in your browser. PHI Mask does not send your text or files to a model provider.
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. Your known contacts stay in this browser until you delete them.
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.
United States · 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.
EU/EEA · 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.
Canada · 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. Free supports personal and professional work, with no account required. The extension starts with a 14-day unlimited trial, then includes 10 masks per week. Professional includes unlimited masks.
Can I use this for client or patient work?
Yes. Free supports personal, professional, clinical and client work. Professional includes unlimited masks. For a team pilot, request access.
Is PHI Mask open source?
No. PHI Mask is commercial software. Free supports personal and professional use; Professional includes unlimited masks. 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. Open the request form.
Try PHI Mask on your next AI chat
Free. No account needed.

