Email Header Parser
Paste raw email headers to break it down into readable components — with a field-by-field breakdown and, where relevant, its structure tree. Everything is processed on your device.
Everything runs in your browser. Your data is never sent to our servers.
Example
Example Input
From: a@x.com To: b@y.com Subject: Hi
Example Output
From a@x.com, Subject Hi
How to Use
- 1Paste the raw email headers you want to parse into the input box.
- 2If the tool asks for an extra field (e.g. a JSON Pointer or JSONPath), fill it too.
- 3Click Parse (or press Ctrl+Enter).
- 4See the component breakdown in the Components tab, the tree structure in the Tree tab (when available), and the normalized JSON in the JSON tab. Click Copy to copy the JSON.
About Email Header Parser
Email Header Parser breaks a raw email header block (RFC 822) into its fields: From, To, Subject, Date, Message-ID, and counts the number of Received hops. Folded header lines are automatically unfolded.
Useful for debugging email delivery, tracing the route, or checking authentication results (SPF/DKIM/DMARC). Everything is processed in your browser.
FAQ
Is my data sent to a server?
No. The entire parsing is done in your browser with JavaScript. Nothing is uploaded, logged, or stored on our servers — safe for sensitive data.
How is this parser different from a validator or formatter?
A parser turns raw input into its component structure so you can see its building blocks (and, for code, its AST/DOM tree). A validator only checks valid/invalid, and a formatter just tidies the layout. A parser focuses on "what it contains and how it is structured".