Is header name matching case-sensitive?

No, header names are compared case-insensitively per the HTTP spec, though original casing is shown.

Can I paste a raw request/response with a status line?

Yes, request and status lines are ignored automatically; only lines with a colon are treated as headers.

Is anything sent to a server?

No, the comparison runs entirely in your browser.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

Do I need an account or an API key?

No. Every tool on Coders Hub is free to use with no sign-up, no API key and no usage limits.

HTTP Header Comparator

Diff two sets of HTTP headers, case-insensitively.

Support

Works Offline

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No API

Headers A

Headers B

Differing values

Header	A	B
Content-Type	application/json	application/json; charset=utf-8
Cache-Control	no-cache	no-store
X-Request-Id	abc123	xyz789

Only in A

Server

Only in B

None.

Identical headers

None.

About the HTTP Header Comparator

Paste two sets of HTTP headers side by side and see which headers only appear in A, only in B, which have differing values, and which are identical — with case-insensitive header name matching.

Examples

Compare cache headers

A: Cache-Control: no-cache | B: Cache-Control: no-store

Output

Differing value for Cache-Control

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

Version 1.0.0 · Updated 2026-08-10 · Runs entirely in your browser