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MIME Type Finder

Find MIME types for any file extension — and extensions for MIME types. Set correct Content-Type headers fast — local reference, free, no signup.

100% Local Browser Native

How to Use the MIME Type Finder

1. Enter extension or MIME

Either direction works.

2. Read the mapping

Registered type with aliases.

3. Set headers

Content-Type plus disposition as needed.

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Frequently Asked Questions

Common web MIME types?

text/html, text/css, application/javascript, image/webp, font/woff2 — mislabeled types break rendering (JS served as text/plain won't execute).

Extension to MIME?

Enter .avif, .mjs, .wasm — exact registered types return with aliases. New formats register at IANA; this reference tracks common ones.

Why do downloads break?

Wrong Content-Type (or missing Content-Disposition) makes browsers display instead of downloading. Set both headers from the lookup.

Do MIME queries upload?

No — lookup runs against a local reference in your browser. Nothing leaves your device.

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Last updated October 2026