Header Forge

Modify HTTP headers and requests. Pay once.

Header Forge sets request and response headers, redirects, and rewrites right in your browser. No ads, no account, no subscription, and nothing about your browsing leaves your device.

Add to Chrome Free to install. No account required.

Features

Request and response headers, free

Set, add, or remove headers on both the request and the response. Response-header editing is part of the free tier here, not locked behind a paywall.

Pro power when you need it

Unlock full regex URL matching, redirects and URL rewrites, per-tab and per-domain scoping, request blocking, and unlimited rules with a single one-time purchase.

Yours, with nothing in the way

No ads, no account, no cloud. Import your ModHeader and Requestly rules in one click, then keep them running with no subscription and no read-only lockouts.

Screenshots

Header Forge rule manager listing rules that add an Authorization header, override the User-Agent, and set an Access-Control-Allow-Origin response header
Every header rule in one clean manager.
Header Forge rule editor open with a request Origin header and a response Access-Control-Allow-Origin header, showing that response-header editing is free
Edit request and response headers for free.
Header Forge popup with a master switch and several enabled profiles for toggling header rules on and off quickly
Flip rules on and off from the popup.
Header Forge Pro showing a regex URL match rule that redirects staging API requests to production using capture-group substitution
Go Pro for regex matching and redirects.
Header Forge importing a ModHeader export into a new profile in one click, the frictionless way to switch from ModHeader or Requestly
Bring your rules from ModHeader and Requestly.

Pricing

Free

$0

  • Request and response header editing
  • Up to 20 rules and 5 profiles
  • Domain, contains, and wildcard matching
  • One-click ModHeader and Requestly import

Pro

$34.99 one time

  • Everything in Free
  • Unlimited rules and profiles
  • Full regex matching and exclude patterns
  • Redirects and URL rewrite with capture groups
  • Per-tab, per-domain, and per-window scoping
  • Request blocking and resource-type filters
Get started

Frequently asked questions

How do I modify HTTP headers with Header Forge?

Install Header Forge, open the rule editor, and add a rule: pick how to match the URL (domain, contains, wildcard, or regex on Pro), then add header operations to set, add, or remove request or response headers. Turn the rule on and Header Forge applies it locally through Chrome's declarativeNetRequest engine. The first time you enable a rule, Chrome asks for access to the sites it touches.

Is Header Forge a good ModHeader alternative?

Yes. Header Forge does the core job ModHeader does, without the ads, without an account, and without paywalling response-header editing. It also imports your existing ModHeader rules in one click, so switching takes seconds.

Can I edit response headers for free?

Yes. Editing request and response headers is part of the free tier. You can set, add, or remove headers on both sides of a request without paying. Pro adds regex matching, redirects and rewrites, scoping, blocking, and unlimited rules.

Is Header Forge free?

The free tier is fully functional: up to 20 rules and 5 profiles, request and response header editing, domain, contains, and wildcard matching, and one-click import from ModHeader and Requestly. Pro is a single one-time purchase of 34.99 dollars that unlocks unlimited rules, regex matching, redirects, scoping, blocking, and resource-type filters. When you reach the free limit your existing rules keep running; we only ask you to upgrade before adding new ones.

What data does Header Forge collect?

Your rules and the pages and requests you modify stay in your browser. Header Forge uses declarativeNetRequest, so it applies your rules without reading or transmitting your traffic. The only network calls are an anonymous license check with ExtensionPay and a small set of anonymous usage events sent to Plausible Analytics, which you can opt out of in the options page. See the privacy policy for details.

Which browsers are supported?

Header Forge supports Google Chrome and other Chromium-based browsers that can install extensions from the Chrome Web Store.

How do I get support?

Email support@mongooselabs.dev and we will get back to you.