Email header analyzer
header-lens
Paste raw email headers and get a visual phishing verdict in seconds: routing, authentication, spam scores and sender mismatches, all on one screen.
- Runs entirely in your browser
- Nothing is stored, ever
- No sign-up, no API keys
Paste email headers
Waiting for headers
Verdict first
A clear phishing or genuine call with the reasons behind it.
Eight visual panels
Routing map, auth donut, spam gauges and mismatch checks.
Raw table on demand
Every header in a searchable side pane, linked from each finding.
Why it's safe to paste real headers here
- Processed on your device. Parsing and scoring run as JavaScript in this tab. There is no server behind this page.
- The browser blocks outbound traffic. A Content Security Policy forbids this page from sending requests or submitting forms, so data cannot leave even by mistake.
- Nothing persists. No cookies, local storage or caching. Leaving or reloading the page wipes everything.
- No third parties. Fonts, scripts and images are served from this repository. No analytics, no trackers, no CDNs.
- Verify it yourself. Open DevTools: the Network tab stays empty after you paste, and Application storage is blank. The full source is on GitHub.