PlainHeaders – Modify Headers, Header Editor — Jacque

PlainHeaders is a small, honest HTTP header editor for developers.
• Set, append or remove request and response headers (Authorization, CORS, CSP, User-Agent, X-Forwarded-For…)
• One-click presets: CORS allow-all, remove CSP / X-Frame-Options, disable caching, mobile user agent
• "This tab only": lock a profile to the current tab so other tabs stay untouched
• Profiles you can switch in one click; pause everything instantly; badge shows active header count
• Import ModHeader-format JSON exports or PlainHeaders backups; export anytime
• Private by design: no analytics, no ads, no remote code. Host access is requested per site when you click "Enable on this site" — never all sites at install. It makes no network requests of its own.
Pro (planned for a later update, optional one-time purchase): several profiles at once, URL filters and redirects. The free tier has no header limit.
Built with AI assistance; maintained by an independent developer.