File Extension & MIME Type Cheat Sheet

Every file extension on this site, its correct MIME type, and which category it belongs to — 58 formats in one reference table. Useful for configuring upload validators, setting `Content-Type` headers, or just double-checking a MIME type you half-remember.

One ambiguity worth knowing: .ts is registered as video/mp2t (MPEG transport stream) in the official IANA MIME registry, but in web development it almost always means a TypeScript source file, served as video/mp2t by strict MIME-sniffing but treated as text/plain or application/typescript by build tooling. Worth checking which context you're in before trusting the extension alone.