Modernize Legacy AVI Files for Today's Players
AVI served us well in the Windows XP era, but modern devices, browsers, and streaming platforms want MP4. Convert your archive of AVI recordings, security camera footage, and old camcorder clips into the universally accepted MP4 format — no codec packs required on the other end.
Why Convert AVI to MP4?
iOS, Android, smart TVs, and game consoles all play MP4 natively but often choke on AVI files that require legacy codecs like DivX or Xvid.
MP4 with H.264 encoding produces files roughly 40-60% smaller than AVI with comparable visual quality, saving serious storage space.
Upload to YouTube, Vimeo, Instagram, or TikTok without format rejection errors — all major platforms prefer or require MP4.
Web browsers can stream MP4 inline with the HTML5 video element, while AVI has zero native browser support.
AVI vs MP4 — Format Comparison
Audio Video Interleave (..avi)
MPEG-4 Part 14 Video (..mp4)
How to Convert AVI to MP4
Upload your AVI file
Select the AVI file from your computer. We accept AVI files encoded with DivX, Xvid, MJPEG, and virtually any other codec.
Let us handle the transcoding
We re-encode your video using efficient H.264 compression. The process preserves resolution and frame rate while shrinking the file.
Grab your new MP4
Download the converted file and enjoy seamless playback on phones, tablets, TVs, and web browsers — no extra software needed.
Frequently Asked Questions
Will I lose quality converting from AVI to MP4?
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There is a small theoretical loss because both formats use lossy video compression. In practice, modern H.264 encoding is so efficient that most people find the MP4 looks identical to the AVI original, often at half the file size.
My AVI uses the DivX codec — can you handle that?
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Yes. Our converter supports all common AVI codecs including DivX, Xvid, MJPEG, Cinepak, and even rare codecs like Indeo. If the file plays in VLC, we can convert it.
How long does a 2 GB AVI take to convert?
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Conversion time depends on video resolution and duration. A typical 2 GB AVI (about 90 minutes of DVD-quality video) converts in 2-4 minutes. HD content takes a bit longer due to the higher frame count.
Does the conversion preserve the original audio track?
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Absolutely. The audio stream is re-encoded to AAC (the standard audio codec for MP4) at a bitrate that matches or exceeds the original. Multi-channel audio is preserved as well.
Pro Tips for AVI to MP4 Conversion
If your AVI is from an old camcorder, check whether it is interlaced — our converter deinterlaces automatically for smooth progressive playback.
For archival purposes, keep the original AVI alongside the MP4 until you have verified the conversion meets your standards.
Batch-convert entire folders of security camera AVI files to reclaim storage space on NAS drives.
Ready to Convert?
Upload your AVI file above and get your MP4 in seconds. Free, fast, and secure.