Email Header Viewer
Unfold a pasted email header block, decode RFC 2047 encoded-words, and list every field in order — entirely in your browser.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
Avoid live production secrets; use dummy or masked data where possible. Data handling details
Summary
Header fields
How it works
Paste the header section of a message (everything above the first empty line). Folded values are joined per RFC 5322 section 2.2.3, and =?charset?B/Q?...?= encoded-words are decoded per RFC 2047 where the browser supports the charset; a charset it cannot decode is left exactly as written rather than guessed at. The tool reports repeated fields that RFC 5322 allows only once, missing From/Date/Message-ID, and lines that are not header fields. It does not resolve any domain, verify SPF/DKIM/DMARC results, or judge whether a message is legitimate — Authentication-Results is shown as written, because only the receiving server that added it can vouch for it. Everything runs locally; nothing is uploaded, stored, or written into the URL.