The HTTP header editor
that doesn't spy on you.
Edit HTTP request headers in Chrome. No ads, no tracking, no surprises. 100% free, no tracking.
No account required. Works instantly after install.
ModHeader added ads. We built the alternative.
ModHeader used to be the standard. Then it started injecting ads and phoning home.
HeaderSnap does one thing: edit HTTP headers. That's it. No analytics embedded in the extension. No ads. No popups interrupting your workflow. Just a clean tool that does what it says.
If you've used ModHeader, HeaderSnap will feel familiar — with one difference: you can trust it.
Everything you need. Nothing you don't.
Edit HTTP Request Headers
Add, modify, or remove HTTP request headers for any URL. Set auth tokens, control caching headers, test API integrations — all without touching your server.
Save Profiles Per Project
Create named header profiles and switch between them with one click. One profile for staging, one for production, one for your client's environment.
Import ModHeader Rules
Already using ModHeader? Import your existing rules in one click. No manual re-entry, no starting from scratch.
Privacy-First by Design
No telemetry. No usage tracking. No external requests. HeaderSnap reads and modifies headers locally — nothing leaves your browser except the requests you're already making.
Regex URL Matching
Apply header rules to exactly the URLs you want. Use wildcards for broad patterns or precise regex for surgical targeting. Rules only fire when and where you need them.
Team Sharing
Export profiles as JSON and share across your team. Everyone on the same headers, every time. Free for everyone — no plan required.
Switching from ModHeader?
One click. Your rules come with you.
Install
Once installed, HeaderSnap inspects HTTP headers in seconds.
Import
Open HeaderSnap → Import → select your ModHeader backup. All profiles transfer instantly.
Browse
Your rules are live. No re-entry, no rebuilding from memory.
HeaderSnap reads ModHeader's export format directly. Import takes 30 seconds.
100% free. No catches.
- Edit HTTP request headers
- Unlimited rules, unlimited profiles
- Regex URL matching
- Team profile sharing (JSON export/import)
- Import ModHeader rules
- No account required. Ever.
No tiers. No feature gating. No trial period. Everything is free for everyone, forever.
ModHeader has ads. Requestly costs up to $23/member/month. HeaderSnap has neither.
Your headers, your rules.
100% free. No account, no ads, no tracking, no upsells. Switch from ModHeader in under a minute.
Works on Chrome and Chromium-based browsers (Edge, Brave, Arc). Manifest V3 compliant.