AVI to MP4 Video Converter
Drop your AVI files — the MP4 video is generated in your browser in seconds. Multiple files at once, no upload on the fast path.
9,214+ video files converted
This tool turns your video into MP4 entirely in the browser. The universal video container — typically H.264 video plus AAC audio. Plays on virtually every device, browser, and app. You can convert several files at once, and because the fast path is local there is no upload step and nothing to clean up afterwards.
Looking to programmatically convert AVI to MP4?
Same engine, available as a JSON API. Drop a file or URL via REST and get the converted video back — no browser, no UI, no rate limits on paid tiers.
Fast response on common video pairs
Webhook delivery for batch jobs
Dozens of video format pairs supported
AVI vs MP4: how they compare
The numbers and capabilities at a glance, so you know what you're trading.
AVI
- Year released
- 1992
- Compression
- Codec-dependent
- Transparency
- No
- Animation
- Yes (video)
- Browser support
- Legacy players
- Best for
- Old software compatibility
MP4
- Year released
- 2001
- Compression
- H.264 (lossy)
- Transparency
- No
- Animation
- Yes (video)
- Browser support
- Universal
- Best for
- Sharing & streaming everywhere
Heads up before converting to MP4
What this specific conversion changes about your video.
Lossless when the codecs already fit
If your AVI uses codecs MP4 accepts, we remux (rewrap) it losslessly and instantly. A codec change re-encodes, which recompresses slightly.
Best practices for MP4
Small choices that keep your output sounding right.
- Play the MP4 result back before deleting your original AVI.
- Pick a preset (Web, Mobile, High quality) to balance size and quality for your MP4.
The importance of a good video conversion
Why getting AVI → MP4 right matters more than you think.
Convert AVI to other formats
Convert other formats to MP4