Gmail Protection
Comprehensive email protection for Gmail users. Catch mistakes, prevent data leaks, and send with confidence — all without your emails ever leaving your device.
Hi Team,
Please find the quarterly financial report attached.
This document is confidential and should not be shared externally.
Best regards,
Alex
You mentioned "attached" but no file is attached.
Sending confidential content to external recipient.
Instant Analysis
Checks complete in under 10 milliseconds. You won't notice any delay.
100% Local Processing
Your email content never leaves your device. Zero cloud processing.
Non-Intrusive
Only appears when there's something to review. Otherwise completely invisible.
Keyboard Shortcuts
Intercepts Cmd/Ctrl+Enter too. Every send action is protected.
Multi-Language
Works in English, Dutch, German, French, Spanish, and Italian interfaces.
Pre-Send Only
Checks happen before sending. Your email history is never scanned.
Every check, explained
Deep dive into each protection layer that keeps your Gmail safe.
Missing Attachment Detection
Automatically detects when your email mentions attachments, files, or documents but none are attached.
What it detects
- •
"Please find attached..." - •
"See the file below" - •
"I've included the document" - •
"Bijgevoegd vindt u..." (Dutch) - •
"Anbei finden Sie..." (German)
How it works
- Multi-language support (English, Dutch, German, French, Spanish)
- Smart context analysis — ignores quoted/forwarded text
- Detects 50+ attachment-related phrases
- Works with inline images vs. actual attachments
External Recipient Warning
Warns when you're about to send sensitive information to recipients outside your organization.
What it detects
- •
Sending to @gmail.com from @yourcompany.com - •
Confidential content to external domains - •
Financial data leaving the organization
How it works
- Automatic domain detection from your email address
- Highlights external recipients clearly
- Checks To, CC, and BCC fields
- Configurable sensitivity rules
Sensitive Content Detection
Identifies patterns that might indicate confidential or sensitive information in your email.
What it detects
- •
Credit card numbers (4111 1111 1111 1111) - •
Social Security Numbers - •
Bank account details - •
Password or credentials mentions
How it works
- Pattern matching for financial data
- ID number format detection
- Configurable sensitivity levels
- No data ever leaves your device
Binding Commitment Alert
Flags language that could create legal or contractual obligations.
What it detects
- •
"I guarantee..." - •
"We commit to..." - •
"This is binding..." - •
"I promise to deliver..."
How it works
- Detects commitment language patterns
- Warns before potential obligations
- Legal phrase recognition
- Helps prevent accidental promises
Reply-All Protection
Prevents accidental reply-all to large groups or distribution lists.
What it detects
- •
Reply-all to company-wide email - •
Responding to large CC lists - •
Distribution list responses
How it works
- Recipient count threshold (configurable)
- Distribution list detection
- Warning before large audience sends
- One-click option to reply to sender only
We never see your emails. Ever.
Every check runs locally in your browser. Your email content, recipients, and attachments never leave your device. Not even metadata.
- Processing happens in your browser
- No data sent to our servers
- Works completely offline
- Open source risk engine
What we collect
Technical specifications
Browser Support
- Google Chrome88+
- Microsoft Edge88+
- Brave Browser1.20+
- Arc BrowserAll versions
Performance
- Average check time<10ms
- Extension size<500KB
- Memory usage<20MB
- CPU impactNegligible
Gmail Compatibility
- Standard Gmail view
- Gmail in Google Workspace
- Gmail mobile web (limited)
- Multiple Gmail accounts
- Gmail keyboard shortcuts
Languages Supported
Interface detection is automatic based on your Gmail settings.
Start protecting your Gmail today
Free for personal use. No credit card required.