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A better alternative to Header Editor - Requestly
Header Editor is a fine free extension for basic header rules, but it stops at headers and redirects. Requestly does all of that and adds response override, API mocking, an API client, and enterprise security.
Why choose Requestly over Header Editor
A modern, browser-first tool that goes beyond header editing, no complex setup, packed with features for both developers and teams.
Actively Maintained
Requestly is fully compatible with Manifest V3 and continuously updated to support evolving browser APIs, security requirements, and developer needs.
Free Header Modifications
Modify request and response headers instantly, no cost, no limits. Perfect for testing CORS, auth, or user-agent scenarios.
Gentle Learning Curve
Designed from the bottom up to maintain a shallow learning curve. Detailed documentation and interactive guides make you a power user from day one.
Simple, Fast & Powerful
A clean, easy-to-use interface designed by UX experts. Use it as a browser extension or a desktop app across Chrome, Firefox, Safari, Edge, Brave, Opera, Vivaldi, Windows, Mac (Apple & Intel), and Linux.
Collaboration & 1-Click Sharing
Promote consistency and accelerate development by sharing Requestly rules within your team.
Import your collection from anywhere in a single click
Already invested in another tool? Bring everything over (collections, environments and auth) without rewriting a thing.
Postman
Insomnia
cURL
OpenAPI
A faster API client. Your data, your way.
Import your Header Editor workspace in one click and try Requestly in under two minutes.
Free · macOS, Windows & Linux
Header Editor Alternative FAQs
Requestly is a powerful HTTP interception and mocking tool that lets you intercept, record, and mock HTTP requests on the fly. While Header Editor is limited to modifying headers, Requestly goes much further, allowing you to redirect URLs, override API responses, inject scripts, block requests, and collaborate with your team using a modern UI.
Yes. Requestly is designed with enterprise-grade security in mind, including features like role-based access control (RBAC), single sign-on (SSO), and SOC 2 compliance. Header Editor is a basic browser extension with minimal security features and limited control over your data.
The HTTP interceptor and several SDKs are open source on GitHub (github.com/requestly/requestly). The API Client core is not open source.
Yes. Requestly offers a Free plan with essential features like unlimited header rules and standard HTTP modifications, perfect for getting started.
Yes. Requestly offers an Enterprise Plan built for larger teams and organizations that need full control and compliance. It includes unlimited usage, API access, SSO & SAML, GDPR and SOC 2 compliance, user access management, SLAs for support and uptime, invoice-based billing, and priority support via Slack Connect, Email, and Chat.
Yes! Requestly is free for students, enjoy access to powerful tools and features with no cost.
Response header modifications done by Requestly are not always visible in the browser's dev tools, but rest assured, they are being applied correctly. You can verify it by inspecting the network traffic through Requestly itself.
Yes, you can apply header modifications to specific HTTP methods by specifying the method condition within the rule settings. This ensures that headers are modified only for requests of certain types.
Yes, Requestly supports one-click migration to seamlessly import your Header Editor settings, making the transition quick and easy.