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File Extension Lookup
Lookup file extension details — find the full format name, MIME type, associated programs, and category for any file extension.
File Extension Lookup
Type or paste a file extension to look up its details
How to Use
- Type an extension — Start typing any file extension (with or without the dot). Results update in real time.
- View details — See the format name, description, MIME type, category, and compatible programs.
- Browse results — If multiple extensions match, all are shown. Narrow down by typing more characters.
Frequently Asked Questions
How many file extensions are in the database?
The database currently includes 100+ of the most common file extensions across all categories — documents, images, audio, video, archives, web development, programming, 3D, CAD, fonts, and more.
What is a MIME type?
A MIME type (Multipurpose Internet Mail Extensions) is a standard identifier used by browsers and applications to indicate the type of data contained in a file. For example, text/html for HTML files.
Can I look up extensions without the dot?
Yes. You can type "pdf" or ".pdf" — the lookup handles both formats automatically.
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