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MIME Type Lookup — File Extension to Content-Type Reference
Search by file extension or MIME type to find the correct match — the Content-Type header value that needs to be right for a browser to handle a served file correctly, or for an upload validator to accept the file types you intend.
How to use MIME Types
- Search by file extension (e.g. ".json") or MIME type.
- Read the matched value.
- Copy it for your Content-Type header or file validator.
Frequently asked questions
- Why does the MIME type matter for file uploads?
- A server or browser often decides how to handle a file based on its declared MIME type — a wrong or missing type can cause a file to download instead of display, or fail a strict upload validator.
- What if a file extension has multiple possible MIME types?
- Some extensions map to more than one valid MIME type depending on context (e.g. .js as text/javascript vs application/javascript); the lookup shows the current standard recommendation.
- Is this list kept current?
- It follows the IANA media type registry and current browser/server conventions, reviewed as standards evolve.
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