PII Airlock by Matinfo

PII Airlock checks what you type in an AI chat and replaces personal data with placeholders before the message is sent. Everything runs in your browser. There is no account, no server and no analytics.

How it works
- Type or paste a message. A small chip near the message box shows how many items will be replaced.
- Press Enter or the send button. Emails, phone numbers, card numbers, IBANs, national IDs, IP addresses, crypto addresses, secrets and names are replaced with placeholders such as <EMAIL_ADDRESS_1>.
- The chat's answer is shown with your real values put back, for display only.
- If the check fails for any reason, the message is not sent. You can edit it or explicitly send it unchecked.

Works on
Works on the most popular AI chat websites. The full list of supported sites is kept up to date on the project page (see Homepage link). No other site is touched.

Modes
- Auto (default): replaces sensitive data silently.
- Review: shows what will be replaced before sending.
- Off, per-site off, and a 1 hour pause.
- Allow and deny lists, and per-type overrides.

Optional better name detection
Turn it on in Settings to download an on-device model (about 181 MB, once, from a pinned Hugging Face version, checksum verified). It is multilingual and catches unusual surnames. Your text is never part of that download.

Privacy
- Your text never leaves your device.
- Placeholder mappings live in memory for the tab, never on disk.
- Permissions are limited to storage and the six supported chat sites.

Limits
Detection reduces risk but cannot guarantee that everything is found. File attachments, voice input and screenshots are not covered.

Interface languages: English, French, German, Spanish, Italian.