Browse all MIME types

audio/aac

AAC balances quality and bitrate for streaming and mobile delivery, which is why it appears in media pipelines and device exports.

audio
Usually already encoded

Content-Type header

Content-Type: audio/aac
Common extensions
.aac

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

audio/aac 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 {
  audio/aac aac;
}
Apache
AddType audio/aac .aac

Signature note

This MIME type does not include a magic-byte sample here because the signature is either format-dependent or not reliable enough to present as a debugging shortcut.

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. .aac is the fastest sanity check for teammates reviewing the file outside the app.

Related audio types