DevHeaders
Fast HTTP request-header modification for developers and testers.
Add, override, and switch outgoing request headers with named profiles — jump between staging, production, and debug setups in one click. Everything runs locally in your browser.
See it in action
A quick look at the popup — named profiles, a master switch, and per-header toggles.
Features
Everything you need to shape outgoing requests, nothing you don't.
Named profiles & one-click switching
Keep separate header sets for staging, production, or any environment, and jump between them instantly.
Master switch
Flip everything off in one click to see the clean, unmodified server response instantly.
Per-header toggle
Enable or disable individual headers without deleting them, so you can test variations quickly.
Icon badge
See the on/off state and active header count at a glance, right on the toolbar icon.
JSON import/export
Back up your profiles or share a working configuration with a teammate in one file.
Privacy-first
Zero network calls, no tracking, no dependencies. All data stays on your device.
How to start
Up and running in under a minute.
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1
Install from the Chrome Web Store
Add DevHeaders to Chrome — no account, no sign-up.
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2
Click the icon & add headers
Open the popup and add your header keys and values to the default profile.
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3
Toggle the master switch on
Your headers now apply automatically to matching requests.
No data collection. No network requests. Everything stays on your device.
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