Maskpaste — Redact Secrets & PII in AI Chats

Maskpaste helps you avoid accidentally pasting sensitive information into AI chat tools. As you type, it checks your message for things like secrets, access keys, tokens, email addresses, phone numbers and card numbers, and warns you before you hit send. All of this happens on your own device. Pasting code, logs or customer data into an AI assistant is one of the easiest ways to leak something private. Maskpaste catches it first. With one click it replaces each match with a clear placeholder such as [REDACTED_EMAIL_1], so your message still reads naturally, and you can swap the real values back into the reply afterwards. Everything runs locally in your browser. Maskpaste has no account and no servers, and it makes no network requests, so the information it protects is never sent anywhere. Features - Checks your message and warns you the moment sensitive data is detected. - One-click redaction replaces each match with a stable placeholder. - Re-hydrate puts the real values back into the response, locally. - Recognises common secret and personal-data formats automatically. - Works on popular AI chat websites. Permissions - storage: saves your settings and the local placeholder map. - scripting and access to the supported chat sites: to read the message box and show the warning. Nothing else. Privacy Detection runs entirely on your device. No servers, no analytics, no data collection. Maskpaste is free to use. A Pro tier with team rules and a local audit log is planned.