Local Header Modifier

Modify HTTP request and response headers locally. No telemetry.

Local Header Modifier lets you change HTTP request and response headers in Chrome for development and debugging — without sending your configuration or browsing data to a third-party service. Use it to: • Add or override Authorization and custom headers • Switch locales, regions, and feature flags • Test CORS, edge cases, and API behavior • Remove headers when you need a clean request Features: • Modify request and response headers (set or remove) • URL filters so rules only apply where you want • Multiple profiles for different projects • Optional comments on each rule • One-click pause for all modifications • Data stored on your device only — no analytics, no remote accounts, no phone-home Privacy: This extension does not collect, transmit, or sell your data. Header rules stay in Chrome’s local storage on your computer. There are no tracking scripts and no external servers operated by us. Perfect for developers who want ModHeader-style control with a privacy-first, auditable extension.