MIME Type Helper

Enter a file extension or file name to get its MIME type, or a MIME type (with or without parameters like "; charset=utf-8") to get its extensions. The table is a curated reference drawn from the IANA Media Types registry and MDN's common-types list (checked 2026-09-01) and covers web, code, document, archive, and media formats. An extension can map to several types, and notes call out common non-standard spellings such as image/jpg. Each entry has a short description in English and Japanese and says whether the type is in the IANA Media Types registry (checked 2026-10-15); unregistered entries are conventional or legacy labels. If the input matches no extension or MIME type, words of the descriptions and notes are searched instead (for example "word" or "画像"), and the result says so. The real type an OS, browser, or web server reports for a file can still differ — they use their own databases (for example Apache mime.types, the freedesktop shared-mime-info database, or the Windows registry) and, in a browser upload, often the OS mapping or content sniffing. This is a reference — a file's actual bytes decide its type (see the Magic Number Reference).