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Convert AVI to MP4
Free, in your browser, with no watermark and no signup. Both are video files; this changes how the video is packaged and encoded.
Why you have a AVI file
AVI is a container from the 1990s that refuses to die, so it turns up in old archives, old camera footage, and anything that has been sitting on a hard drive for a decade. Almost nothing modern accepts it as an upload.
What the conversion actually does
AVI files usually hold older codecs like DivX, Xvid or MPEG-4 Part 2, so the conversion re-encodes to H.264 in an MP4 container. Files typically get noticeably smaller because the newer codec is simply more efficient.
Worth knowing first
Old AVI footage is often interlaced and low resolution to begin with. Converting fixes compatibility, it does not restore detail that was never captured, so do not expect the result to look modern.
How to convert AVI to MP4
- 01
Add your AVI file
Drop it in, or pick it from your device. Free uploads go up to 1 GB per file.
- 02
Choose MP4
Pick the output format from the list. Queue several files of the same type to batch them.
- 03
Download
Watch progress live, then download the result. No watermark, on any plan.
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Frequently asked
How do I convert AVI to MP4 for free?
Open the GrumpTools File Converter, add your AVI file, choose MP4 as the output and download the result. It runs in the browser, output is never watermarked, and free uploads go up to 1 GB per file.
Does converting AVI to MP4 reduce quality?
Old AVI footage is often interlaced and low resolution to begin with. Converting fixes compatibility, it does not restore detail that was never captured, so do not expect the result to look modern.
Can I convert several AVI files at once?
Yes. Queue multiple files of the same type and convert them in one batch, then download them individually or all at once.