Convert legacy AVI video into a modern MP4, on your device.
AVI is one of the oldest video containers still in circulation, a Windows format from the 1990s that shows up in old camcorder footage, screen captures from legacy software, and files people have been carrying between hard drives for years. It works, but it is heavy and dated. AVI files are often large for their quality, and modern phones, browsers, and social platforms frequently will not play them. Converting to MP4 brings that old footage into a format built for today's devices and shrinks it in the process.
The flow is simple. Drop an AVI file on the page or click to select one, then press convert. The tool re-encodes the video to H.264 and the audio to AAC and packages it as an MP4 you can download. Nothing is uploaded and there is no sign-up.
AVI often wraps older codecs like DivX, Xvid, or even uncompressed video, which is part of why the files are so big and why newer devices choke on them. The conversion decodes whatever is inside and re-encodes it with modern H.264, so the result is not just more compatible but usually much smaller than the original for the same viewing quality.
Convert whenever you want that footage to play or upload somewhere modern, which is nearly always. If the file only ever needs to run on an old Windows PC with a full codec pack installed, you can leave it as AVI. The moment you want it on a phone, in a current editor, or online, MP4 is the format to move to.
People reach for this to rescue old home videos and camcorder clips for a phone or cloud backup, to feed legacy AVI into an editor that no longer supports it, to cut the size of bulky archive files that eat disk space, and to prepare clips for a social upload that rejects AVI. It is a common step when digitizing a shelf of old recordings into something a phone can play.
All of it happens locally in your browser, so your footage, including private family videos, never leaves your device. The only thing fetched over the network is the media engine on first use, a one-time download of about 32 MB that is then cached for later runs. The single real limit is your device's memory, since the whole conversion runs on your own hardware rather than on a server somewhere.
AVI often uses older, less efficient codecs and sometimes barely compresses the video at all. H.264 inside MP4 packs the same picture into far fewer bytes, so a converted file is commonly a fraction of the original size with no obvious loss in quality.
Yes, as long as the file plays on your computer it can be decoded and re-encoded to MP4. Camcorder AVI clips using DivX or Xvid are exactly the kind of legacy footage this handles well, and the MP4 will play on phones and modern apps that reject the original.
The conversion preserves the source dimensions, so a 4:3 clip stays 4:3 rather than being stretched to widescreen. Your player may add black bars on the sides, which is normal and keeps people from looking squashed.
No conversion can add detail that was never captured, so grainy or low-resolution AVI stays that way. What you gain is compatibility and a smaller file, not a sharper image. For old footage that is usually the whole point.
There is no fixed limit, but the entire file is processed in your browser, so very long AVI files lean on your device's memory. On a machine with modest RAM, a long clip can be slow or may not finish.
No. The tool carries its own decoder for the common AVI codecs, so you do not install anything on your system. That is one advantage over playing the raw AVI, which often needed a separate codec pack on Windows.
Polished Pixels. All tools. About. Contact. Every tool runs in your browser and your files are never uploaded.