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MIME Type
video/webm
VideoMIME type for WebM video files optimized for the web.
MIME type reference, HTTP example, browser usage, common mistakes, and related content.
What is the video/webm MIME type?
The MIME type video/webm is used to tell browsers, APIs, and servers how a file or response body should be interpreted.
MIME stands for Multipurpose Internet Mail Extensions, and MIME types are now a standard part of HTTP responses and web content delivery.
When a browser or client receives a response with video/webm, it uses that information to decide how the content should be processed, rendered, downloaded, or executed.
Example
Content-Type: video/webm
HTTP example
HTTP/1.1 200 OK Content-Type: video/webm Content-Length: 1256
Common file extensions
.webm
Common use cases
- Web video delivery
- Open media workflows
- Efficient browser playback
Common mistakes
- Using the wrong MIME type for the file being served
- Returning text/plain instead of video/webm
- Forgetting required parameters like charset when relevant
- Using a deprecated MIME type in older server configurations
- Serving assets with a mismatched Content-Type header, causing browser parsing issues
How browsers use it
Browsers use the Content-Type response header to decide how a response should be handled. For example, HTML is rendered as a page, CSS is parsed as styles, JavaScript is executed as script, and images are displayed visually. If the MIME type is incorrect, the browser may refuse to load the file correctly or may treat it as plain text or a download instead.
Browser support
Strong support in modern browsers, but MP4 may still be needed for the broadest compatibility in some environments.
Developer note
Often used as a modern web-friendly alternative to MP4 in some workflows.