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=...,.envstyle)
When you paste something like:
pwd: supersecret123
API_KEY=sk-abc123def456
Authorization: Bearer xyz987.token
MaskGPT instantly rewrites it into:
pwd: [MASKED]
API_KEY=[MASKED]
Authorization: Bearer [MASKED]
git clone https://github.com/yourusername/MaskGPT.gitchrome://extensions/
- Enable Developer mode
- Click Load unpacked
- Select the folder where
manifest.jsonis located
You’ll see the MaskGPT icon. It’s ON by default.
- Navigate to ChatGPT or another LLM-supported website.
- Start typing. Your sensitive info (in paste or typed) will be masked before submission.
- Click the extension icon to enable/disable masking.
Here's what will be masked:
API_KEY=sk-abc123
SECRET=xyz
password: hunter2
Authorization: Bearer abc.def.ghi- Regex pattern config from UI
- Activity stats
- Chrome Extension Release
Protect your secrets. Stay safe. Use MaskGPT.