Free HTTP Header Parser that works offline
Turn copied browser, curl or server headers into a searchable structure without exposing tokens or cookies to an online parser.
What this http header parser does
HTTP headers are case-insensitive names with string values, and some names can appear more than once. The parser preserves duplicates instead of silently overwriting them.
How to use the HTTP Header Parser
- Enter or paste raw HTTP header lines with an optional request or status line into the tool.
- Adjust the available options so they match the format and result you need.
- Choose Parse headers and review a structured table and JSON representation before using it.
- Copy or download the result, then clear the page if the input was sensitive.
Common uses
- Inspecting response security headers
- Reviewing API request metadata
- Converting curl output to JSON
- Checking repeated cache or cookie headers
Private processing and offline access
This tool does not submit your input to a conversion server. Processing takes place inside the browser using local JavaScript and standard Web APIs. After the PWA has been installed or cached, the page and its core features remain available without an internet connection. Closing or clearing the page removes unsaved input; the tool does not create an account or cloud history.
Tips for accurate results
- Remove secrets before sharing parsed output.
- Header parsing does not validate protocol semantics.
- Set-Cookie values contain their own semicolons and remain intact.
Frequently asked questions
Does this tool upload my data?
No. HTTP Header Parser processes its input in the current browser and does not submit it to a conversion API.
What input does the HTTP Header Parser accept?
Colon-separated HTTP header lines are supported. Folded legacy continuation lines are joined to the previous header.
Can I use this tool offline?
Yes. Once the Offline Tools PWA has cached the page, the core feature works without an internet connection.