Show HN: MaskGPT – A Chrome Extension That Masks Secrets in Copied Text

A privacy-first browser extension to mask sensitive data like passwords, tokens, and API keys before they reach LLMs like ChatGPT(Now only GPT).

MaskGPT automatically detects and masks sensitive information (e.g., pwd: mypassword, API_KEY=..., Authorization: Bearer ...)

• API keys (sk-..., AKIA..., API_KEY=...)
• Tokens (access_token=..., Authorization: Bearer ...)
• Environment variables (DB_PASS=..., .env style)

When you paste something like:

MaskGPT instantly rewrites it into:

• Enable Developer mode
• Click Load unpacked
• Select the folder where manifest.json is located

You’ll see the MaskGPT icon. It’s ON by default.

1. Navigate to ChatGPT or another LLM-supported website.
2. Start typing. Your sensitive info (in paste or typed) will be masked before submission.
3. Click the extension icon to enable/disable masking.

Here's what will be masked:

• Regex pattern config from UI
• Activity stats
• Chrome Extension Release

Protect your secrets. Stay safe. Use MaskGPT.

MIT