Convert AVI to MP4 Online
Turn an AVI file into an MP4 without installing conversion software or hunting for codecs. Convert the file as it is, or trim and clean it up first, in your browser.
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How to Convert AVI to MP4
Turn AVI Files Into MP4s You Can Use Anywhere
Play It on More Devices
AVI is an older container that phones, smart TVs, and some browsers refuse to open. Converting to MP4 makes the same footage playable on all of them, and it matters when uploading too, since most platforms treat MP4 as their default format.
Fix the Old Aspect Ratio
Footage from an AVI-era camcorder is usually 4:3, which leaves black bars down both sides of a widescreen phone. Resize the video to 16:9 or 9:16 so it fills the frame people will actually be watching it on.
Reduce the File Size
Compress the file after you convert it. Adjust the compression level, frame rate, and resolution with the sliders, and the estimated file size updates as you go, so you can see the trade-off before committing to an export.
Clean Up the Sound
Old recordings often carry hiss, hum, or levels that jump between scenes. Remove background noise, even out the volume, and add a fade at either end, so the MP4 sounds better than the AVI you started with.
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Why Use Flixier to Convert AVI to MP4
Render in the Cloud
Flixier renders on its own servers rather than on your machine, so a long AVI does not tie up your laptop during export. You can start the next file in the meantime instead of waiting for the first one to finish.
Edit Before You Convert
Trim the parts you do not need, crop the frame, add text, or drop in music on the same timeline. What comes out is a finished cut, not a straight copy of the AVI sitting in a different container.
Improve the Video
Old AVI footage is often dark or flat, especially if it was captured on a camcorder or a capture card. Adjust the contrast and brightness, or apply a filter before exporting, so the MP4 looks better than the original, rather than simply matching it.
Publish From the Editor
Send the finished MP4 straight to YouTube, Instagram, TikTok, or Facebook without downloading it first. This is useful when the whole point of converting was to get the footage onto a platform that would not accept the AVI.
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Still have questions?
We got you!
How do I convert AVI to MP4?
Upload your AVI to Flixier from your device, cloud storage, or a link. Drag it onto the timeline, make any edits you want, then go to Export, choose Video, and click Export and Download to save the MP4.
Does converting AVI to MP4 lose quality?
There's some re-encoding, so a small amount is lost. Export at the resolution the AVI was recorded at, and it's hard to spot on a phone, a laptop, or a TV. Dropping the resolution to save space is what costs you visible detail.
Why is MP4 better than AVI?
AVI dates back to the early nineties and stores video less efficiently, so the same footage takes up more space on your drive. MP4 uses modern encoding, which is why a converted file is usually smaller and why every social platform accepts it.
Can I convert other formats to MP4?
Yes. The same converter takes MKV, MOV, MPEG, and other common video formats. Upload the file you already have and export it as an MP4 without converting it first.
Is the AVI to MP4 converter free?
Flixier has a free plan that allows for up to 2GB of storage, 10 minutes of exports, and 5 minutes of subtitles per month. If you need more, there are also paid subscriptions available that offer additional features, including some unlimited options. Check out our pricing plans for more information.
