HeaderSnap

Inspect and modify HTTP request headers per URL pattern. Clean ModHeader replacement.

HeaderSnap is a clean, privacy-first HTTP header editor for web developers, QA engineers, and API developers. No ads. No tracking. No upsells. Just the tool you need. ─── WHAT YOU CAN DO ─── • Edit, add, and remove HTTP request and response headers • Save named header profiles for each project or environment • Switch profiles instantly — no manual re-entry • Match headers to specific URLs using regex patterns • Import your existing ModHeader rules in one click • Export and share profiles with your team ─── WHO IT'S BUILT FOR ─── • Web developers testing auth headers, CORS configs, and API integrations • QA engineers spoofing user agents, locales, and feature flags • API developers debugging request/response cycles • Anyone who relied on ModHeader ─── SWITCHING FROM MODHEADER? ─── HeaderSnap imports ModHeader rules directly. Open the import dialog, paste your existing config, and you're done. Same rules, cleaner tool. ─── FREE. ALWAYS. ─── HeaderSnap is 100% free — unlimited rules, unlimited profiles, no account required. All features available to every user. The extension is 100% free with no monetization. ─── PRIVACY ─── HeaderSnap does not collect usage data, send analytics, or display ads. Ever. Your header configs stay on your machine.