Which MP4 files have embedded attachments?

Attachments in MP4 files are cover art — an image stored inside the file, usually added by a music or tagging application. It is most common in M4A and MP4 audio files, and also appears in some video files.

The embedded image as a downloaded file (PNG or JPEG). The original MP4 is not modified.

What if my file has no cover art?

There is nothing to extract, so the conversion reports an error. Files up to 80 MB are supported.

Extract cover art from an MP4 online

Some MP4 and M4A files carry more than audio or video: they have a cover image embedded inside the file. This page extracts that attachment — no media player, no tag editor, no installs.

How to extract cover art

Upload an MP4 or M4A up to 80 MB.
Press Convert file.
Download the extracted image from the result page.

What you get

The embedded picture as a single download, exactly as it was stored in the file. Nothing is re-encoded, so the image keeps its original quality and format (PNG or JPEG).

Limits

80 MB input
one embedded image per file
20 MB per extracted image

If your file has no embedded cover art, the extraction cannot produce anything and reports an error instead of guessing.