Convert AVI to MP4
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AVI is a decades-old Windows format that still shows up in old camcorder footage, downloaded files, and software exports — but it’s bulky and increasingly unsupported by phones, browsers, and video editors. This tool decodes your AVI and re-encodes it into a modern, compact MP4.
Your AVI file is decoded locally and the new MP4 is encoded using your browser’s hardware-accelerated codec support, so the process stays quick and entirely on your device — nothing is ever uploaded.
Also useful: Convert MKV to MP4 · Convert MOV to MP4
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Frequently asked questions
Why won’t my AVI file play on my phone or in a web player?
AVI is an old container format that many modern devices, browsers, and streaming platforms simply don’t decode anymore. Converting to MP4 makes the video playable pretty much everywhere.
Is my AVI file sent to a server to be converted?
No. The file is decoded and re-encoded locally in your browser — nothing is uploaded, and the process works the same whether your connection is fast, slow, or offline after loading.
What are the size, duration, and browser requirements?
Up to 300MB on desktop (100MB on mobile), and up to 30 minutes on desktop (10 on mobile) since this re-encodes video. You’ll need an up-to-date Chrome, Edge, Firefox, or Safari, since the final encode step relies on WebCodecs.