AVI to MP4 converter
Make old AVI videos play everywhere, without uploading them.
or drop them here, or paste them
Nothing is uploaded.
This converter loads its engine (31 MB) from jsDelivr the first time. jsDelivr sees your internet address, never your file.
About AVI to MP4
AVI files come from older cameras, camcorders, screen recorders and video downloads from the 2000s. Inside, they often use codecs such as Xvid, DivX or Motion JPEG, which phones, smart TVs and websites no longer play. MP4 with H.264 video and AAC sound plays practically everywhere.
Browsers can't read AVI by themselves, so this converter uses FFmpeg, the open-source video tool behind countless video programs, running inside your browser. The first time, your browser downloads FFmpeg's core, about 31 MB, from jsDelivr, a public code library; after that it works offline. Only that program is downloaded: your video stays on your device.
Because FFmpeg runs on a single processor core in the browser, conversion is slower than in a desktop app: roughly real time on a recent computer, slower on phones. Short clips are done quickly; a full-length film takes a long time, so a desktop program is the better choice for those.
The MP4 keeps the resolution and frame rate of the original, with quality close to it. Videos up to a few hundred megabytes work well; very large files can run out of browser memory.
Questions and answers
That is FFmpeg itself, the program that reads AVI files. It downloads once, when you choose your first file, and your browser keeps it for next time.
The video is decoded and encoded again by FFmpeg on one processor core. Formats your browser understands, such as MOV or WebM, convert much faster.
No. FFmpeg runs inside your browser and the video never leaves your device. Only FFmpeg's own program files are downloaded.