Convert an AVI file into a guaranteed-playable MP4 locally - lossless in seconds if it has H.264, otherwise honestly re-encoded. No upload.
Running locally on your device ...
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
AVI (Audio Video Interleave) is Microsoft's 1992 container - older than the web itself - and deliberately permissive: unlike MP4 or MOV, the AVI specification barely constrains which codec goes inside. That is exactly what made AVI the container of choice for the DivX/Xvid encoding scene of the early-to-mid 2000s (movie rips, downloads) as well as many Windows screen-capture and camcorder programs. That freedom is why two ".avi" files today can hold completely different, incompatible video codecs.
The honest, decisive distinction: an AVI file from a modern tool (current screen-capture software, some cameras/converters) very likely already carries H.264 with AAC or MP3 audio - that closes losslessly via a repackage, with no quality loss and no waiting. An AVI from the DivX/Xvid ripping era, on the other hand, carries an MPEG-4 Part 2 codec no current browser or hardware can decode anymore - for that, the tool fully re-encodes the picture frame by frame in your browser to H.264 instead of handing back a file that looks converted but silently refuses to play.
That real re-encode runs single-threaded (this site cannot use shared memory across threads) and can take several minutes for longer clips - correct and complete matters more to us than fast and broken. Everything runs locally in the browser, with your file never uploaded.
| Input formats | AVI |
|---|---|
| Output format | MP4 |
| Batch processing | No |
| Processing | Locally in your browser (WebCodecs) |
| File upload | None |
Limitations: If the AVI already carries H.264 (common with modern capture/converter tools), the conversion is lossless and finishes in seconds, original audio track included. If it carries an older codec like DivX/Xvid, the tool automatically and fully re-encodes the picture to H.264 and the audio to AAC - frame by frame in your browser, which can take several minutes for longer clips, rather than a silent false promise of speed. One file per run, an honest device-dependent size/length limit applies depending on which path is taken - never a silent truncate.
No, the entire conversion happens locally in your browser - both the fast repackage and the real re-encode.
If the AVI already carries H.264, a lossless repackage is enough (seconds). If it carries an old DivX/Xvid codec, the tool has to honestly and fully re-encode the picture (minutes).
Popular MPEG-4 Part 2 video codecs from the early-2000s movie-rip scene - no browser or hardware chip today can play them back anymore.
Yes - either a lossless repackage or a real re-encode, never a file that looks converted but does not play. If a file exceeds the honest size/length limits, the tool says so clearly instead of silently truncating.
During a lossless repackage, no. During a real re-encode (old codec), yes, slightly - as with any re-encode.
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