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AVI to MP4 Converter

Modernise old AVI video into MP4 — usually far smaller, and playable again.

Converters Reviews Free · no sign-up

Drop an AVI here, or click to choose one

Converted on your device — the video is never uploaded

Result

Quick Tool Overview

The AVI to MP4 Converter modernises old DivX and Xvid video into H.264, which usually makes the file dramatically smaller and playable on current devices again.

What it does
Converts old AVI video to MP4
You give it
An .avi, DivX or Xvid file
You get back
A much smaller H.264 MP4
Best for
Old family video and archive clips
Converters Free, unlimited use No sign-up Runs in your browser

About the AVI to MP4 Converter

AVI dates from 1992 and it shows: enormous files, ageing codecs like DivX and Xvid, no support for modern features, and a flat refusal from most phones, smart TVs and web platforms. Old family video and downloaded clips from a decade ago are still full of them.

The conversion runs in your browser through ffmpeg.wasm — the real ffmpeg, compiled to WebAssembly. Nothing is uploaded: a wedding video, a client recording or an unreleased track never leaves your machine. The engine is a one-off download of about 32 MB, after which your browser caches it and every later conversion starts immediately.

Converting to H.264 in an MP4 usually shrinks the file dramatically — the same footage in a modern codec at a fraction of the size — and makes it playable on everything again. Choose the quality and encoding speed, scale down, change the frame rate, trim to a section or drop the audio.

Key features of the AVI to MP4 Converter

Big size savings

A modern codec needs a fraction of the space for the same footage.

Playable again

Phones and smart TVs decode H.264 in hardware.

Quality control

Keep it faithful, or shrink it further.

Trim as you convert

Give a start time and a length to take just the part you need.

Nothing is uploaded

ffmpeg runs inside the browser tab, so the file never leaves your computer.

How to use the AVI to MP4 Converter

  1. 1

    Drop the AVI in

    DivX and Xvid files included.

  2. 2

    Choose quality and size

    Good quality usually still shrinks an old AVI a lot.

  3. 3

    Trim if you want a section

    A start time and a length.

  4. 4

    Convert and download

    A modern MP4, much smaller.

Frequently asked questions

Usually much smaller. H.264 is far more efficient than the codecs AVI files typically carry, so the same footage needs a fraction of the space.

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