Convert AVI to MP4 — Offline
Drop one or more legacy AVI files onto MiniMax Converter and remux or re-encode them to MP4 with H.264 video and AAC audio. Batch a whole folder at once, pick your quality, and keep the result playing everywhere. Runs locally — no upload, no file-size limit, no watermark.
How to convert
- Drag your AVI file (or a whole folder of them) onto the MiniMax Converter window.
- Choose MP4 as the output format from the format chooser.
- Set the quality and resolution options, or keep the defaults for a balanced H.264/AAC encode.
- Click convert and save the MP4 files to your chosen folder.
Plays on everything
AVI is a 1990s Microsoft container that often holds old codecs (DivX, Xvid, MS-MPEG4) many phones, browsers, and smart TVs refuse to play. Converting to MP4 with H.264 video and AAC audio gives you a file that plays natively almost everywhere — iOS, Android, Chrome, Safari, QuickTime, and most TVs — without extra codec packs.
Re-encoding is lossy — here's the honest part
Going from one compressed codec to another means re-encoding, which is lossy: the picture is decoded and re-compressed, so there's a small generational quality loss. MiniMax uses sensible H.264 defaults to keep that loss minimal, and you can raise the quality if you want a near-transparent result. The MP4 is usually smaller than the original AVI thanks to H.264's better efficiency.
Why offline?
Online AVI-to-MP4 converters cap file sizes (often 100–500 MB), throttle your upload, process one file at a time, and frequently add ads or watermarks. AVI files from old camcorders are often huge — converting locally handles any size, runs at full CPU speed, batches a whole folder, and keeps your videos on your own machine. No upload, no account, no telemetry.
Questions and answers
Will it work on large AVI files (several GB)?
Yes — there's no file-size cap. ffmpeg processes the video in a streaming pass, so memory use stays constant no matter how big the AVI is.
Is converting AVI to MP4 lossless?
No. Re-encoding from the AVI's codec to H.264 is lossy, so there's a slight generational quality drop. Using a higher quality setting keeps the loss visually negligible for most footage.
Can I convert a whole folder of AVI files at once?
Yes. Drop a folder or select multiple files and they all convert in one batch, processed in parallel to use your CPU fully.
Will the audio and subtitles carry over?
The audio track is re-encoded to AAC so it stays in sync and plays everywhere. Note that AVI doesn't store modern soft subtitle tracks the way MP4/MKV do, so there's usually nothing extra to carry over.
Related tools
Get MiniMax Converter
Cross-platform desktop app. Linux free for non-commercial use; Windows & macOS one-time €20 license. No subscription, no telemetry, no account.