Compare software

Header EditorModHeader
Free

Free and open source.

 Free

Free browser extension with no sign-up.

Browser extension Browser extension
  • Edits request and response headers
  • Can modify response bodies
  • Edits both request and response headers, including cookies
  • Filters rules by URL, tab or resource type
  • Rule writing assumes some knowledge of HTTP
  • Only affects traffic from the browser
  • Closed source
Browser extension Browser extension
Open source Closed source
License not stated License not stated
No account needed No account needed
Works offline Not stated if it works offline

Checked October 1, 2026

Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.