MIME Type Reference
A comprehensive MIME type (Multipurpose Internet Mail Extensions) reference. Look up the standard Content-Type for any file extension (.json, .pdf, .mp4) along with its transfer format.
Tool Guide
Introduction to the MimeType File Format Cheat Sheet
The MimeType File Format Cheat Sheet collects hundreds of common file extensions and their corresponding MIME types (Content-Type).
It is widely used in front-end and back-end development for setting Content-Type, validating upload/download file formats, configuring HTTP response headers, identifying file storage types, and more.
The tool supports quick Ctrl+F search and is suitable for developers to reference in daily work.
What is a MimeType?
A MIME (Multipurpose Internet Mail Extensions) type, also known as a media type or content type, is a standard used on the internet to identify the format of file content.
Through the MIME type, a browser or server can decide how to handle a file based on its type. Common formats include: text/html: web page files, application/json: JSON data,
image/png: PNG images, application/pdf: PDF documents, audio/mpeg: MP3 audio.
How to Use the MIME Type Reference Chart
Step 1: Browse the page content or use the browser shortcut Ctrl+F to search for keywords (such as an extension or MIME type).
Step 2: Find the corresponding file extension and MIME type.
Copy the query result for use in configuring a web server, API response headers, form upload validation, and more.
Frequently Asked Questions About MimeType File Formats (FAQ)
What is the relationship between a MIME type and a file extension?
A browser or server often determines the MIME type from the extension, but the accurate approach is to identify the content format through the MIME type. The two usually correspond one-to-one.
What problems can an incorrect MIME type cause?
The browser may parse the resource incorrectly or refuse to load it, and API endpoints may return errors or be blocked by security policies.
Can I define a custom MIME type?
A server can manually configure MIME mappings for custom extensions, but the client also needs to recognize them.
What is the MIME type for a JSON file?
It is application/json, the standard response format for RESTful APIs.
What should I do if I can't find the type I need in the table?
We recommend referring to the official IANA MIME registry for the complete list of standard MIME types.
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