.webm MIME Type — video/webm

Q: How do I set the Content-Type for .webm in Nginx?

Make sure video/webm webm; is listed in the types block (usually in /etc/nginx/mime.types) and reload Nginx.

video/webm

MIME type for .webm

Video

What is the MIME type of .webm files?

The MIME type (media type) for WebM video files with the .webm extension is video/webm. Open VP8/VP9/AV1 video format supported by all modern browsers.

Content-Type header

Content-Type: video/webm

Server configuration

Server	Configuration
Nginx (`mime.types` or `types {}`)	`video/webm webm;`
Apache (`.htaccess`)	`AddType video/webm .webm`
IIS (`web.config`)	`<mimeMap fileExtension=".webm" mimeType="video/webm" />`
Node.js / Express	`res.type('webm')` or `res.setHeader('Content-Type', 'video/webm')`
Amazon S3	Set `Content-Type: video/webm` on the object (metadata), or pass `--content-type video/webm` to `aws s3 cp`

Should .webm files be compressed?

No. WebM video files are already compressed internally, so gzip or Brotli would waste CPU and barely reduce — sometimes even increase — the size. Leave video/webm out of your compression configuration.

Why the MIME type matters

Browsers decide what to do with a response — render, run, play or download — from the Content-Type header, not the file extension. With X-Content-Type-Options: nosniff, a wrong type causes stylesheets and scripts to be blocked outright. For uploads, never trust the type sent by the client; check the file’s content (its magic bytes) on the server.

Frequently asked questions

What is the MIME type for .webm?

video/webm.

How do I set the Content-Type for .webm in Nginx?

Make sure video/webm webm; is listed in the types block (usually in /etc/nginx/mime.types) and reload Nginx.

Should I gzip .webm files?

No — the format is already compressed, so HTTP compression gives no benefit.

.webm MIME Type: video/webm