Browse all MIME types

video/webm

WebM is optimized for browser playback and streaming efficiency, making it a strong delivery format for modern web video.

video
Usually already encoded

Content-Type header

Content-Type: video/webm
Common extensions
.webm

How teams usually encounter it

This page maps the media type to the file extensions and delivery behaviors developers usually care about: browser parsing, upload validation, cache correctness, and asset handling.

Compression signal

video/webm is usually already compressed or stored in a binary-heavy format, so extra transfer compression tends to help less.

Server config snippets

Use these when a server is missing the right extension-to-MIME mapping or you want the expected header to survive a proxy, CDN, or custom asset bucket setup.

Nginx
types {
  video/webm webm;
}
Apache
AddType video/webm .webm

Magic bytes / file signature

When you need to validate uploads or investigate a mislabeled file, the signature often starts with 1A 45 DF A3.

Operational shortcut

If a browser downloads this asset instead of rendering it correctly, check the response header first, then verify the extension mapping on your origin and edge cache. .webm is the fastest sanity check for teammates reviewing the file outside the app.

Related video types