How It Works
Three simple steps to protect your sensitive information before sharing with AI.
Paste Your Text
Copy your sensitive document—emails, contracts, or any text containing private information—into MaskContext.
Anonymize
Click 'Anonymize' or select specific text. Our AI detects and masks names, locations, and sensitive data automatically.
Use Safely
Copy the protected text to use with any AI. When you get a response, paste it back to restore original values.
100% Client-Side ProcessingYour Data Never Leaves Your Device
MaskContext runs entirely in your browser. We don't see your data, store it, or send it anywhere.
Without MaskContext
Pasting sensitive data directly into AI tools sends it to external servers. Your data may be stored, used for training, or exposed in breaches.
- Data sent to third-party servers
- May be used for AI training
- Risk of data breaches
With MaskContext
Anonymize your data before it leaves your clipboard. Our AI runs locally in your browser—even works offline.
- Processing stays on your device
- Works offline—no internet required
- No data stored, ever
Instant Processing
No network delays after initial load. Anonymization happens instantly on your device.
Zero Knowledge
We cannot see what you type. There is no backend, no database, no logs.
Offline-Ready
Disconnect your internet and it still works. Try it yourself.
Keyboard Shortcuts
Work faster with these keyboard shortcuts (desktop only).
About Detection Accuracy
MaskContext uses NLP models optimized for English text. While it excels at detecting common entities like names, locations, and organizations, no system is perfect. For critical text, we recommend manually reviewing the anonymized output before sharing. You can always select and mask additional text manually for complete control.