MP4 to AVI Converter – Free Online

Video & Audio Converter

Total Estimated Output Size: 0.00 KB

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How to Convert MP4 to AVI Online

Upload your MP4 file

Drag and drop your .mp4 file onto the page or click to browse. You can select several MP4 files at once to batch-convert them.

AVI is preselected

The output format is already set to AVI, so you can convert immediately. If you need to, adjust the codec, resolution, frame rate or bitrate in the settings panel first.

Convert and download

Click Convert. The AVI file is processed on your own device; nothing is uploaded to a server. When it finishes, click Download to save it (or Download all to get a batch as a ZIP).

Why Convert MP4 to AVI?

Some older editing programs, karaoke systems, DVD players with USB ports and industrial hardware only accept AVI. Converting MP4 to AVI gives you a container those systems recognise while keeping the same picture.

Our converter writes H.264 video and MP3 or AC3 audio into the AVI, which plays in Windows Media Player, VLC and most legacy devices. Expect a similar or slightly larger file than the MP4.

Private by design: your MP4 file is converted on your own device and never uploaded.
AVI preselected: the output format is already chosen, so it is a one-click conversion.
Batch friendly: convert several MP4 files in one go and download them as a ZIP.
No limits, no watermark: free for files of any size, with nothing stamped on the output.

MP4 vs AVI

MP4 (MPEG-4 Part 14): MP4 is the most widely supported video container in the world. It usually carries H.264 or H.265 video with AAC audio, plays on every phone, browser, TV and editing app, and is the safest choice for sharing. It is best for sharing, social media, web playback and mobile devices.

AVI (Audio Video Interleave): AVI (Audio Video Interleave) is Microsoft's classic container from the early Windows era. It is still recognised by almost every Windows program and older media player, though its files tend to be large. It is best for legacy Windows software and older hardware players.

In short: keep MP4 when the priority is sharing, social media, web playback and mobile devices, and switch to AVI when the file is headed for legacy Windows software and older hardware players. Need a different target? The full Video Converter supports every format listed below.

MP4 to AVI FAQ

Will the AVI be larger than my MP4?

Roughly the same size if you keep H.264. AVI has a little more overhead than MP4 but does not change the compressed video data.

Which audio codec should I choose for AVI?

MP3 is the safest choice for legacy players. Pick AC3 if the AVI is destined for a DVD player or home-theatre receiver.

Is this MP4 to AVI converter free?

Yes. Converting MP4 to AVI on MediaConverter.io is completely free, with no watermark, no sign-up and no daily conversion limit.

Are my MP4 files uploaded to a server?

No. The converter runs inside your browser using WebAssembly and WebCodecs, so your .mp4 file is read and converted on your own device. Nothing is uploaded, which keeps private recordings private and means there is no waiting in an upload queue.

Is there a file size limit for MP4 to AVI?

No fixed limit. Because processing happens locally, the practical limit is your computer's memory and patience; multi-gigabyte MP4 files convert fine on a desktop browser. Very large files take longer on phones.

Will converting MP4 to AVI reduce quality?

The video is re-encoded into AVI. Keep the source codec, resolution and bitrate (the defaults) and the result is visually the same as your MP4; lowering the bitrate or resolution is what reduces quality, and you control that trade-off in the settings panel.

Which browsers support the MP4 to AVI converter?

Current versions of Chrome, Edge, Firefox and Safari on desktop all work. Chrome and Edge are fastest because they expose hardware-accelerated WebCodecs decoders.