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AVI to MP4 converter

Bring old AVI files from cameras, phones and downloads into MP4, the format every device plays today.

Runs in your browser. Your file is never uploaded.

How to convert AVI to MP4

  1. 1Drop one or more AVI files into the box above.
  2. 2Keep MP4, and pick 720p if you want a smaller file.
  3. 3Select Convert and download the MP4.

What you get

  • Most AVI files hold DivX, Xvid or MJPEG video, so they're re-encoded to H.264 with AAC sound. The MP4 is often much smaller than the AVI.
  • If the AVI already holds H.264 video and AAC sound and you keep the original resolution, the tracks are copied into the MP4 as they are. That takes seconds and loses nothing.
  • The main video and the first sound track are kept. Subtitle tracks, extra audio languages and chapters are left out.
  • Up to 3 files at a time free, or 30 with Pro.

Limits

  • Free, with or without an account: files up to 500 MB, 3 at a time.
  • With Pro: files up to 2 GB, 30 at a time.
  • Big files are read from your disk as they're processed, so they don't need to fit in memory, but a phone takes longer than a computer.

What happens to your file

Your file never leaves your device. The conversion runs in your browser using code from our site, and we don't receive the file, its name or anything inside it. How we handle files.

AVI to MP4: common questions

Is this AVI to MP4 converter free?
Yes. Files up to 500 MB convert free, without an account and without a watermark. Pro raises the limit to 2 GB a file and converts up to 30 files at a time.
Why is the MP4 smaller than my AVI?
H.264 compresses far better than the codecs most AVIs use. A camcorder MJPEG clip can shrink to a tenth of its size at similar quality.
Can I go the other way, MP4 to AVI?
Yes. Open the Video converter and pick AVI. It uses MPEG-4 video and MP3 sound, which suits old DVD players and TVs.
Is my video uploaded?
No. The conversion runs in your browser, so the video stays on your device and never reaches our server. Once the page has loaded it keeps working if your connection drops.
Why does the first conversion take a few seconds to start?
The converter is a copy of FFmpeg that runs in your browser. It's about 31 MB, so it downloads the first time you use it and your browser keeps it for next time.

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