Convert MP4 to AVI Online
Turn MP4 files into AVI 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 MP4 to AVI nowHow to convert MP4 to AVI
Open the converter
Click the button to open the MP4 to AVI tool. It loads instantly — no install, no signup.
Drop your MP4 file
Drag your MP4 file into the upload area or click to browse. The file stays in your browser memory only.
Download AVI
The conversion runs locally and finishes in seconds. Click download to save the AVI file to your device.
MP4 vs AVI at a glance
Key technical differences between the two formats, so you know what to expect before converting.
| Feature | MP4 | AVI |
|---|---|---|
| Type | Video container | Video container |
| Compression | Lossy | — |
| Audio track | Yes | Yes |
| Common codecs | H.264, H.265, AV1, AAC | MPEG-4 Part 2 (DivX/Xvid), MJPEG, MP3 |
| Browser support | All browsers | Not playable natively |
| Extensions | .mp4 | .avi |
| MIME type | video/mp4 | video/x-msvideo |
| Introduced | 2003 · MPEG (ISO/IEC 14496-14) | 1992 · Microsoft |
What changes when you convert MP4 to AVI
- MP4 and AVI are containers. The video and audio streams are re-encoded into codecs that AVI supports (typically MPEG-4 Part 2 (DivX/Xvid), MJPEG, MP3), so you get a file that plays reliably rather than a simple rename.
- The audio track is carried over to the AVI file, re-encoded if needed.
- AVI is newer or less widely supported than MP4. Check that the website, app or device where you will use the file accepts AVI.
About MP4
MP4 (MPEG-4 Part 14) is the most widely supported video container. It typically holds H.264 or H.265 video with AAC audio and plays on virtually every phone, browser, TV and editor.
- Best for
- Sharing videos, uploading to social networks and YouTube, and playback on any device.
- Strengths
- Universal playback, good compression, streaming-friendly.
- Limitations
- Lossy codecs, so repeated re-encoding gradually reduces quality.
About AVI
AVI (Audio Video Interleave) is a Microsoft container from 1992. It was the standard for PC video for years and can hold many codecs, such as DivX, Xvid or MJPEG.
- Best for
- Old digital camera clips, legacy Windows video and archived downloads.
- Strengths
- Simple container, widely supported by desktop players.
- Limitations
- Large files, no browser playback and weak support for modern codecs and features.
Frequently asked questions
Is the MP4 to AVI conversion really free?
Yes. ConverterUp is fully free, with no signup, no watermarks, and no daily quota for the MP4 to AVI converter. We support the project through unobtrusive ads.
Are my MP4 files uploaded to a server?
No. Conversion runs in your browser using WebAssembly. The MP4 bytes never leave your device, and we have no upload endpoint at all.
What is the maximum file size?
For MP4 input, the soft cap is 50 MB for images and 500 MB for video. Practical performance depends on your device's RAM.
Will the AVI file open everywhere?
AVI is mainly for desktop players and editing software — browsers cannot play it directly.
Does converting MP4 to AVI keep the sound?
Yes. The audio track is kept and, if necessary, re-encoded into a codec that AVI supports.
Related guide
How to Convert MP4 to GIF Free OnlineRelated conversions
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