Home / Security & Privacy / Email Header Analyzer
Email Header Analyzer
Paste email headers to see SPF, DKIM and DMARC results, every server hop and delay, and phishing warning signs.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Email Header Analyzer works
Everything runs in your browser. Files and text are never uploaded, so the private data you are protecting never leaves your device. Headers are unfolded and read on your device. Received lines are put in order to show the route and the time each hop took.
Input: Text, EML. Output: TXT.
How to use Email Header Analyzer
- In your mail app, choose Show original or View source.
- Copy the headers and paste them, or drop a .eml file.
- Read the checks and warnings.
Tips
- Nothing is uploaded, so you can use these tools on sensitive files.
- Share passwords a different way than the file itself.
- Always check a cleaned or redacted file before you send it.
Email Header Analyzer FAQ
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Document Leak Checker: See names, GPS, comments, tracked changes, hidden sheets, emails and keys inside files before you share them.
- Link Tracking Cleaner: Remove utm, fbclid, gclid, si and 90 more trackers from links, and unwrap Google, Facebook and Outlook redirect links.
- Metadata Scrubber: Remove hidden data from photos, PDFs, Office files and MP3s in one batch: GPS, camera, author, company and more.
- Password ZIP: Make an AES-256 password-protected ZIP that opens anywhere, or unlock one you have the password for.