Convert AVI to MP4 Online
Turn AVI files into MP4 directly in your browser using ConverterUp. There is no upload, no waiting in a queue, and no account required — your files stay on your device while WebAssembly does the work locally. Adjust quality and dimensions where supported, then download the result. The output keeps the visual fidelity you'd expect from a desktop app while running entirely in the browser tab.
Convert AVI to MP4 nowHow to convert AVI to MP4
Open the converter
Click the button to open the AVI to MP4 tool. It loads instantly — no install, no signup.
Drop your AVI file
Drag your AVI file into the upload area or click to browse. The file stays in your browser memory only.
Download MP4
The conversion runs locally and finishes in seconds. Click download to save the MP4 file to your device.
Frequently asked questions
Is the AVI to MP4 conversion really free?
Yes. ConverterUp is fully free, with no signup, no watermarks, and no daily quota for the AVI to MP4 converter. We support the project through unobtrusive ads.
Are my AVI files uploaded to a server?
No. Conversion runs in your browser using WebAssembly. The AVI bytes never leave your device, and we have no upload endpoint at all.
What is the maximum file size?
For AVI input, the soft cap is 50 MB for images and 500 MB for video. Practical performance depends on your device's RAM.
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Ready to convert AVI to MP4?
Open the tool, drop your file, and download the result. No upload, no signup, no watermarks.
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