Our apps / Mask & Restore
MAC APP

Mask & Restore

Swap real data in CSV and Excel files for stand-ins, then restore it

Swap the names, emails, phone numbers and addresses in a CSV or Excel file for realistic stand-ins before you share it with a contractor, a colleague or an AI. A project key saved on your Mac puts the real values back when the file returns, even after it was sorted or edited.

$9.99 Buy now Download free

Free to use without a key: CSV and TSV files up to 200 rows, each project key with one file, the review list and restoring returned CSV files.

Buy a license key to unlock Pro: unlimited rows, one key across many files, Excel workbooks and restoring pasted text.

macOS 14 Sonoma or later · Version 1.0 · 2.9 MB disk image · Notarized by Apple

One-time $9.99 for the app with Pro: unlimited rows, one key across many files, Excel workbooks and restoring pasted text. No subscription. One license key works on up to 3 of your Macs.

Download: The download (a signed, notarized .dmg) comes with your purchase in your Gumroad receipt, together with your license key. Updates install from inside the app.

Buy now opens Gumroad's checkout on this page; Gumroad is the seller and handles payment, sales tax and your receipt.

The columns of a customer survey, each with its kind and the stand-ins it will get

Features

  • Realistic stand-ins in the right format: names, emails at reserved example domains, 555 phone numbers, made-up streets and towns
  • One encrypted project key (Keychain or passphrase): the same person gets the same stand-in in every file
  • A review list before anything is written; untick any value or add what was missed
  • Restore a returned CSV or Excel file, even sorted, edited or added to
  • Excel .xlsx: only cell text changes, so formulas, formatting and every sheet stay as they were
  • Restore pasted text, such as an AI's reply
  • Unlimited rows; export or import a key with a passphrase
  • Pseudonymization, not anonymization: anyone with the key can restore the file, and names inside free text can be missed, so check notes columns before you share
The review list: every value found and the stand-in it will get, with checkboxes to keep any of them
The saved copy, before and after: real names, emails, phones and addresses replaced by stand-ins
Restoring: an edited copy and a pasted AI reply with the real values put back

Requirements

macOS 14 Sonoma or later. Apple silicon and Intel. Current version: 1.0.

Privacy

Your files and keys never leave your Mac. The only network requests are the license check with Gumroad and checking for updates.

Mask & Restore privacy policyHelp and support

Questions about your purchase or license key? Reply to your Gumroad receipt or contact us.