mp4
MPEG-4 Part 14
The default container for web and mobile video. Pairs H.264 or H.265 video with AAC audio and plays essentially everywhere.
Convert MP4 to AVI
Free, no account, no watermark. Converted on our servers, then deleted.
Drop an MP4 file here
As many as you like. We will show you what they convert to.
How to convert MP4 to AVI
- 1
Choose your file
Drop an MP4 file onto the converter, or pick one from your device. You can add several at once.
- 2
Select AVI
Pick AVI as the output format. Open Settings if you want to control the video codec, the quality or bitrate, and how long to spend, and 12 more.
- 3
Download the result
Convert and download the finished file. No account, and nothing to install.
avi
Audio Video Interleave
A long-lived Microsoft container. Widely readable, but inefficient next to modern formats.
MP4 to AVI, asked and answered
Does converting MP4 to AVI lose quality?
Yes. MP4 has already discarded some detail and AVI discards more, because re-encoding starts from what survived the first pass rather than from the original.
Can I convert the AVI back to MP4?
Yes, and the file will open — but a round trip is not free. Each pass re-encodes, so going MP4 to AVI and back leaves you with less than you started with.
What can I change about the AVI it produces?
You can set the video codec, the quality or bitrate, how long to spend, ten-bit colour, the resolution, an exact width, how it fits, the frame rate, which way to turn it, whether to mirror it, where it starts and stops, the audio codec, the audio bitrate, the sample rate, and mono or stereo. Anything left on Auto is decided by the encoder, which is usually the right answer unless you are targeting a specific size or device.
Where does the conversion happen?
On our server. The file is sent over HTTPS and converted in a sandbox with no network access of its own; your input and the result go together, removed at once if it fails and otherwise kept for a few minutes so you can download them, then deleted — whether or not you did. There are no accounts for anything to be kept against.
Is there a limit on file size?
Yes — there is a per-file cap and an hourly job limit, because this runs on one small server. The API page states the limits currently in force rather than a number baked into this page.