CloudConverterConvert AVI to MP4 to make old camera clips, downloads and archived videos play on phones, TVs and modern editors. MP4 is smaller and far more widely supported.
AVI vs MP4: what changes
AVI is a container from the 1990s. Depending on which codec is inside, the file may be large and many modern devices cannot play it. MP4 is the standard format for phones, TVs, browsers and social platforms, and it usually compresses video more efficiently.
When to convert AVI to MP4
Use it for family videos on old cameras, clips from older software, and any AVI that a phone, TV or editor refuses to open.
Before you convert
The video is re-encoded, so conversion takes longer for big files. Output is limited to 1920 pixels on the longest side. Very old, low-resolution AVI files are not enlarged and will keep their small size.
Tips for converting AVI to MP4
If you have many old AVI files, convert the most important ones first, one at a time. Keep the original AVI until you have played the MP4 and checked the sound and picture.
Convert AVI to MP4 on any device
Open this page on your phone or computer, choose the AVI and download the MP4. On a phone, pick the video from the Files app or gallery. On Windows and Mac, drag the file onto the upload box. Uploads can be up to 200 MB.
Frequently asked questions
Why won't my AVI file play?
AVI is only a container and the codec inside can be one that modern phones and TVs do not support. MP4 solves most of these problems.
Will the MP4 be smaller than the AVI?
Usually yes, often by a lot, because MP4 compresses more efficiently than most older AVI files.
Does the MP4 keep the audio?
Yes. The audio is converted along with the video.
What is the maximum file size?
200 MB per file.
Will it work on my TV or iPhone?
MP4 is supported by almost every phone and TV, so in most cases yes.
Is it free to convert AVI to MP4?
Yes. It is free, with no sign-up and no watermark.
Are my files kept after conversion?
No. Uploaded files are processed and deleted after your download. We do not keep a library of your files.
Is there a file size limit?
Uploads are capped at 200 MB per file.