About converting AVI to MP4
Convert AVI to MP4 online for free - the conversion happens locally in this tab, so your file never gets uploaded to a server. AVI is a legacy Microsoft container still produced by older camcorders and capture software, generally far larger than a modern equivalent. MP4 with H.264 is the most broadly supported video container in existence, playing natively in every browser, phone, TV and editor without extra codecs.
Converting AVI to MP4 is normally about playback compatibility and file size: the source came off a camera or an old archive, and the destination is a browser, an editor or a platform with its own container requirements.
Because every conversion runs on your own device through WebAssembly builds of the same open-source engines desktop tools use, there is no upload queue, no file-size cap imposed by a server, and no copy of your AVI sitting in someone else's storage afterwards. That matters most for anything you would hesitate to hand to a third party - identity documents, contracts, medical scans, unreleased work, client material. It also means the converter keeps working with no network connection at all once the page has loaded.
AVI to MP4 is one of many routes available here. If a direct path between two formats does not exist, the converter automatically chains several conversions together to reach the one you asked for, so you can get from almost any input to almost any output in a single step.
How to convert AVI to MP4
- Drop your AVI file onto the area above, or click it to browse for one.
- Confirm that "Convert from:" reads AVI - it is detected from your file automatically.
- Check that "Convert to:" is set to MP4. It is already pre-selected on this page.
- Press Convert, then save the converted video when it is ready.
Frequently asked questions
- Is this AVI to MP4 converter free?
- Yes, completely. There is no charge, no account, no watermark on the output and no daily conversion limit.
- Are my files uploaded to a server?
- No. The conversion runs in your browser using WebAssembly, so your AVI file never leaves your device and nothing is stored anywhere after you close the tab.
- Is there a file size limit for AVI to MP4 conversion?
- There is no server-imposed limit, because there is no server involved. The practical ceiling is your own device's available memory, so very large files convert faster on a desktop than on a phone.
- Will the MP4 output look the same as the AVI original?
- It depends on the target format. MP4 output is produced at high quality settings, but converting into a lossy format always discards some data by design, and re-encoding an already-lossy file compounds that. Convert from the highest-quality source you have rather than from a previously converted copy.
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