Convert AVI to AAC
We turn AVI into AAC right in your browser — the file never goes to a server.
What you will lose
- Compression becomes lossy: the original quality cannot be restored
How they differ
| AVI | AAC | |
|---|---|---|
| Lossless | yes | no |
| Lossy | yes | yes |
| Multichannel | yes | yes |
| Tags | no | yes |
| Released | 1992 | 1997 |
| Author | Microsoft | MPEG |
AVI
Good at
- Opens where nothing else does any more: nineties hardware, old players
- People put uncompressed video inside, so some archives are still masters
- Simple enough that a damaged file can often be read at least in part
Awkward about
- Several times heavier than modern containers at the same quality
- Neither browsers nor phones will play it
- Keeps no titles or cover art, and handles subtitles and extra tracks badly
Use it when
- The file came out of an old archive and just needs to open
- Some program insists on it and understands nothing newer
- In every other case it is worth turning into MP4
AAC
Good at
- Noticeably better than MP3 at the same size
- The native format for Apple gear and most phones
- Handles multichannel audio and tags
Awkward about
- Older devices and car stereos may refuse it
- Lossy — the original cannot be recovered from it
- Encumbered by patents, unlike Opus
Use it when
- Listening on a phone without wasting quality
- A voice memo, or a track pulled out of a video
- You want a balance between size and sound
Common questions
- Does the file get uploaded to a server?
- Yes, this pair needs the server: browsers cannot encode that format. The file and the result are deleted within a couple of hours and never shared.
- Will surround sound survive?
- Yes, AAC carries more than two channels — 5.1 stays 5.1.
- Can I get the original quality back afterwards?
- No. AAC is lossy, and the discarded detail cannot be recovered. Keep the original if you may still need it.
- How many files, and how large?
- Up to 5 files at a time, 500 MB each. No sign-up, no watermarks.