ModHeader Extension: HTTP Header Editor

Modify headers, cookies and redirects. Add, edit or remove custom HTTP headers. Ad free, local ModHeader alternative.

Modify HTTP headers on any website. ModHeader Extension is a fast, clean, ad-free Chrome extension for modifying headers: add a custom header, edit HTTP headers, or remove them, on both requests and responses. Organize them into profiles and target exactly the sites you want. Everything runs locally in your browser, with no account and no telemetry. Looking for a ModHeader alternative? This mod header editor is a clean, lightweight ModHeader Chrome extension replacement, rebuilt to respect your privacy. Wondering how to add a header? Create a rule, type the name and the value, and it applies instantly. No reload, no account, no setup. ✨ WHAT YOU CAN DO (FREE) ✓ Add, edit or remove custom headers on requests AND responses (set, append or remove) ✓ Unlimited profiles, switch with a single click ✓ Apply everywhere, or filter by URL ✓ Turn individual rules, a whole profile, or the entire extension on or off in one tap ✓ Import your existing ModHeader backups ✓ Export and share your setup as JSON ✓ Light and dark theme ✓ 21 languages ✓ No ads, no tracking, no account ⭐ PRO (one payment, no subscription) ✓ Redirect any request to another URL ✓ Cookie editor (Cookie and Set-Cookie) ✓ Per-tab profiles: different headers on different tabs ✓ Regex URL conditions ✓ Export a profile as a ready to run cURL command 🔒 PRIVATE BY DESIGN Everything happens on your device. ModHeader Extension collects no data, has no telemetry and needs no account. The only network request it ever makes is to validate your Pro license, and only if you choose to buy it. 💡 PERFECT FOR • Web developers testing APIs, auth tokens and CORS • QA engineers reproducing and debugging requests • Anyone who needs header modification without opening DevTools • Anyone who needs to set a User-Agent, add an Authorization header, or fix caching