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AVI→MP4

AVI to MP4

AVI to MP4 is a free online video converter for changing AVI files into MP4 files. AVI to MP4 accepts 2 MIME types, returns video/mp4, includes 1 setting, and runs in your browser on the device.

Drop .avi file here

or click to choose

Options

Key facts

Input
1 format: AVI (video/x-msvideo, video/avi)
Output
MP4 (video/mp4)
Runtime
your browser on the device
Settings
1 control: Quality (CRF)
File mode
1 input file creates 1 output file
Cost
$0, no account required

How to use AVI to MP4

  1. 1

    Open your AVI file

    Drop your AVI file onto the page, or click to browse and pick one from your device.

  2. 2

    Choose options

    Adjust the conversion options to suit your needs. Defaults work well for most inputs.

  3. 3

    Convert and download

    Click Convert. Your MP4 file is ready to download in seconds.

AVI to MP4 details

First, AVI to MP4 reads AVI source files and prepares MP4 output for the video workflow. Next, The visible controls are Quality (CRF). Additionally, Files and text stay in the browser session.

Re-encode an AVI file; often an older or camcorder-era format; into a modern MP4 with H.264 video and AAC audio. MP4 is supported by every phone, browser, and TV, and produces a much smaller file than the original AVI for the same visual quality. The conversion runs locally via ffmpeg.wasm, so your file never leaves your device. Performance depends on your CPU: expect roughly real-time encoding for short clips (a 5-minute 720p video may take 1;2 minutes). Sources taller than 1080p are automatically downscaled to 1080p so the browser does not run out of memory mid-encode; for best results keep inputs under about 500 MB.

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Related tools

Tools that work with the same formats — most users open one of these next.

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WebM to MP4

Convert WebM video to MP4 (H.264 + AAC) — free online, no upload.

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MKV to MP4

Convert MKV (Matroska) video to MP4 (H.264 + AAC) — free, runs in your browser.

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MOV to MP4

Convert MOV (QuickTime) video to MP4 (H.264 + AAC) — free online.

MOV→MP4
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MP4 to WebM

Convert MP4 video to WebM (VP9 + Opus) — free, runs entirely in your browser.

MP4→WEBM

Frequently asked

What is AVI to MP4?

AVI to MP4 is a free online video converter for changing AVI files into MP4 files. AVI to MP4 accepts 2 MIME types, returns video/mp4, includes 1 setting, and runs in your browser on the device.

What files does AVI to MP4 accept and create?

AVI to MP4 accepts AVI files (video/x-msvideo, video/avi) and creates MP4 files (video/mp4). The page includes 1 setting: Quality (CRF).

Do my files and data stay private?

Yes. AVI to MP4 runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.

How do I use AVI to MP4?

Open AVI to MP4, drop in your AVI file, choose any options, and click Convert. Your browser does the work locally and produces a MP4 file you can save right away.

What is the maximum file size for AVI to MP4?

Because AVI to MP4 runs in your browser, the maximum size depends on your device's available memory. Most modern phones and laptops handle files up to a few hundred MB without issues.