This page, right now: 0 third-party connections · 0 cookies
Maskwise
ESENFRITDE Try it free

For Mac · Works offline · No accounts

Give the AI the contract
for John Carter[PERSON_1]

Maskwise hides names, ID numbers, bank accounts and addresses in PDF, Word, Excel and PowerPoint files before they reach ChatGPT or Claude. It runs on your Mac and checks every copy.

Coming soon to the Mac App Store Try it on this page →

macOS 14 or later · Apple silicon or Intel · 7 days free

Review: Maskwise marks what it found. You decide what gets hidden.

Service agreement.pdf · Maskwise
Maskwise in Review mode: sidebar with the kinds of data found and the contract with the data marked Maskwise redacted PDF: the contract with data blacked out and tagged Maskwise For AI view: the contract text with tags like [PERSON_1] Maskwise with grey mosaic redactions
40+kinds of personal data, with check digits
5countries: US, Spain, France, Italy, Germany
10file formats, scans included
0bytes sent to the internet by the app

The most common mistake

A black box redacts nothing.

Cover a value with a black shape in a PDF and the text is still underneath. Anyone can select it and copy it. See for yourself.

Box drawn on topSTILL THERE
The buyer, Ms. Laura Bennett, holder of SSN 219-09-9999, acquires the property described in Schedule A.
What gets copiedPress the button.
Redacted with MaskwiseREMOVED
The buyer, Ms. █████████████, holder of SSN ███████████, acquires the property described in Schedule A.
What gets copiedPress the button.

Redaction

What you hide is gone.

Maskwise finds the data, shows it to you so you decide, and saves a PDF where it no longer exists: not under the box, not in the metadata.

  • Black, white, grey or mosaic, with optional tags on each redaction.
  • Scanned signatures and stamps, always hidden whole.
  • Boxes drawn by hand, rectangles or ellipses, for anything else.

PROFESSIONAL SERVICES AGREEMENT

New York, March 14, 2026.

Between John Carter[PERSON_1], SSN 219-09-9999[SSN_1], residing at 412 Elm Street, Brooklyn, NY 11215[ADDRESS_1], phone (212) 555-0187[PHONE_1],

and Emily Shaw[PERSON_2], on behalf of NORTHGATE ADVISORS LLC[COMPANY_1].

2. Fees. John Carter[PERSON_1] shall pay $2,400 to account DE89 3704 0044 0532 0130 00[ACCOUNT_1].

✓ COPY CHECKED

For AI

The AI sees tags. You get names back.

Each person, company or account gets a consistent tag across the document. When the AI answers, Maskwise puts the real data back into its reply.

  • Consistent: “John Carter” and “Mr. Carter” are the same [PERSON_1].
  • Reversible only on your Mac: the tag table is encrypted with a key in your Keychain.
  • Shortcuts: ⌃⌥A anonymizes copied text; ⌃⌥R restores it.
Your document“…the claim by John Carter against NORTHGATE LLC…”
Maskwise“…the claim by [PERSON_1] against [COMPANY_1]…”
The AI“[PERSON_1] may recover damages from [COMPANY_1]…”
Back to you“John Carter may recover damages from NORTHGATE LLC…”

Formats

Word, Excel and PowerPoint, formatting intact.

The AI copy keeps styles, tables and formulas. And Maskwise also checks what you don't see at first glance.

  • Comments, notes, headers and footers, tracked changes and document author.
  • Sheets, charts and pivot tables in Excel, without breaking formulas.
  • Images showing data or faces inside Office, replaced with a placeholder.
DOCXShareholder claim.docx4 comments · 2 headers · authorCHECKED
XLSXPayroll October.xlsx3 sheets · 128 formulas intactCHECKED
PPTXClient deck.pptxspeaker notes · 1 image removedCHECKED
PDFScanned deed.pdf12 pages read with OCRCHECKED

Verification

Every copy is checked. And it tells you when it can't.

After saving, Maskwise reads the result again, with OCR when needed, to check that what you marked no longer appears. If something can't be read, such as an embedded object, you'll see it flagged.

PDFService agreement.pdf14 values hidden · 0 found in the copyCHECKED
DOCXExpert report.docx1 embedded object that can't be readNOT VERIFIED

Try it now

Type some data. See what the AI would get.

A very small version of the Maskwise detector, running in your browser. Change the text or paste your own: it never leaves this page.

Your text
What the AI would see
Processed in your browser. Nothing is sent.

Also

The details that matter.

Offline

The app has no network permission. No accounts, no servers, no analytics.

You decide

Step through the data one by one, unmark what you want to keep and add your own words.

Undo

⌘Z and ⌘⇧Z for everything: marks, boxes, shape changes.

Scanned documents

Text recognition on your Mac. Flags handwritten or unreadable lines.

Five languages

English, Spanish, French, Italian and German, in the interface and the tags.

Mac App Store

Protected by Apple's sandbox. Purchases and refunds handled by Apple.

NamesCompaniesSSNEINPassportsDriver's licencesIBANCardsPhone numbersEmailsAddressesDates of birthCase numbersContract and policy numbersLicense platesEU VATDNI / NIENIRCodice fiscaleSteuer-IDSignatures and stamps

Who it's for

For anyone who works with other people's data.

Confidentiality and privacy law, together.

Summarize a complaint, compare contract drafts or outline a brief without the AI knowing who the parties are.

BeforeCase No. 1:25-cv-01234, filed by John Carter against Northgate Advisors LLC…
For the AICase No. [CASE_1], filed by [PERSON_1] against [COMPANY_1]…

No small print

What we promise. And what we don't.

No automatic tool finds 100% of the data in every document. Maskwise shows you what it found, checks what it saves and warns you when it can't check.

  • ✓Your documents never leave your Mac.The app has no network permission.
  • ✓What you redact is removed.Nothing is left underneath: the saved page no longer contains it.
  • ✓Every copy is checked.If something can't be read, you'll see NOT VERIFIED.
  • ✕We don't promise “zero leaks”.Always review the result before sharing it.

Price

Pay once. Keep it.

No subscription. Try the full app for 7 days before you decide.

Maskwise Professional

$59

One-time purchase. Lifetime licence. £59 in the UK, 59 € in the eurozone.

Coming soon to the Mac App Store

macOS 14 or later · Apple silicon or Intel
Purchases and refunds handled by Apple

  • Every feature, no document limits.
  • Redacted PDFs and AI copies in Word, Excel and PowerPoint.
  • Restore the AI's answers with the real data.
  • Scanned documents, signatures and stamps.
  • Interface in five languages.
  • 7-day free trial with everything included.

Why it exists

“I wanted to use AI at my firm without putting my clients at risk. I couldn't find a tool that worked offline, respected my documents' formatting and checked the result. So I built one.”

GSGonzalo SabaterLawyer in Spain. Creator of Maskwise.

Questions

Frequently asked.

Do my documents leave my Mac?

No. Maskwise works entirely on your Mac and has no internet access. There are no accounts, servers or analytics.

Which formats does it support?

PDF (including scans), images, Word (.docx and .doc), Excel (.xlsx), PowerPoint (.pptx), RTF, ODT, TXT, CSV and HTML.

Does it work with Claude, Gemini or Copilot?

Yes. The AI copy is an ordinary document or text, so it works with any assistant.

How much does it cost?

The 7-day trial is free. After that, a single purchase unlocks Maskwise Professional for good, with no subscription. The price in your country is shown in the App Store.

Does it guarantee that no data slips through?

No automatic tool can guarantee that. Maskwise reads every copy again to check that what you marked no longer appears and, if it cannot check something, it says so with a NOT VERIFIED notice. Always review the document before sharing it.

Is there a Windows or team version?

Mac only for now. If you need it for several seats, get in touch.

AI, yes.
Your clients' data, no.

Try it free for 7 days on your Mac.

Coming soon to the Mac App Store Questions? Write to us