Guides / How to convert AVI to MP4 on Mac (free, no command line)

How to convert AVI to MP4 on Mac (free, no command line)

Updated 2026-06-17 · Runs locally — nothing uploaded

Quick answer

Turn an old .avi into a modern, universally playable .mp4 on your Mac — clean H.264, no command line, nothing uploaded. One step with FFmix.

Output
Anything → MP4
Processing
On your Mac
Setup
About 2 minutes to set up
Access
Free local task
Get it free on the Mac App Store

AVI is a relic — reliable for years, but QuickTime and modern apps frequently refuse it, usually because of the old DivX/Xvid codec inside. MP4 with H.264 fixes that everywhere.

FFmix re-encodes your .avi to a clean, widely compatible .mp4 at near-lossless quality — on your Mac, with nothing uploaded. The new file lands next to the original, and you can see the exact command before it runs.

Steps

  1. 1 Drag your .avi file into FFmix.
  2. 2 Choose the Convert task and pick MP4 (or the Anything → MP4 preset).
  3. 3 Confirm and click Start — the .mp4 appears next to the original.

Advanced: canonical ffmpeg recipe

This is the canonical recipe. FFmix adapts encoder flags to the engine on your Mac, then shows the final command; the command shown is the command run.

ffmpeg -i input.avi -c:v libx264 -crf 20 -pix_fmt yuv420p -movflags +faststart -c:a aac -b:a 160k output.mp4
FFmix has a one-click "Anything → MP4" preset

Drop a file and go — all local, nothing uploaded.

Download FFmix free

FAQ

Why won't my AVI play on Mac?

AVI is an older container, often holding DivX or Xvid video that QuickTime can't decode. Converting to MP4/H.264 makes it play natively on macOS, iPhone, and modern apps.

Will converting AVI to MP4 lose quality?

AVI's legacy codecs always need a re-encode. FFmix uses CRF 20 for near-lossless output — the result usually looks identical, is far more compatible, and is often smaller too.

Is anything uploaded?

No. The conversion runs locally through the bundled ffmpeg engine; your file never leaves your Mac.

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