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Convert AVI to MP4 on your Mac

macOS and QuickTime won't open AVI. Convert AVI to MP4 on your Mac so it plays everywhere, with nothing uploaded. The desktop app batches entire folders.

Conversion Successful

How to Convert AVI to MP4

  1. 1

    Get TeraConvert for Mac

    Built for Apple Silicon. One-time Pro purchase, 14-day money-back guarantee.

  2. 2

    Drop your AVI files

    One file or a whole batch at once.

  3. 3

    Pick MP4 and convert

    Everything runs locally; nothing is uploaded.

Why Convert AVI to MP4?

AVI is a Windows container from the 1990s, and most phones, smart TVs, and streaming boxes made this decade either refuse it outright or decode it in software until the battery gives out. MP4 fixes both problems.

H.264 video, AAC audio, plays everywhere.

AVI
MP4
Container
AVI
Container
MP4 (ISOBMFF)
Typical codec
Various (DivX / XviD / MPEG-4)
Typical codec
H.264 / H.265
Audio codec
MP3 / PCM
Audio codec
AAC
Streaming friendly
No
Streaming friendly
Yes
Device support
Limited on modern devices
Device support
Universal
Typical use
Legacy archives
Typical use
Web, mobile, TV

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Frequently Asked Questions

Why can't modern devices play AVI files?
AVI was designed for Windows 9x-era hardware and software. Many modern device players and streaming platforms have dropped AVI support to focus on efficient modern containers.
Will the video and audio stay in sync after conversion?
Re-encoding to MP4 rebuilds the container timestamps, which also fixes the drift some old VBR-audio AVI files show in playback.
What codec does the output MP4 use?
The output uses H.264 video with AAC audio, the combination supported by virtually every device, browser, and platform.
My AVI file has subtitles. Are they kept?
No. Embedded subtitle tracks are not carried over; keep the original AVI if you need them.
Is my file still private in the desktop app?
Yes. The desktop app converts with native engines on your Mac and works offline after a one-time activation check. Nothing is uploaded, in the browser or on desktop.

Converting a large legacy video archive?

TeraConvert Desktop converts AVI files of any size through native FFmpeg, batch included.

Get TeraConvert for MacThis format runs in the Mac app. One-time Pro purchase, 14-day money-back guarantee.