AVI to MP4 Converter

AVI to MP4 Converter | Online Free Tool | Elysia Tools

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category: Media
Input types: file, select, number
Output type: file
Sample coverage: 4
API ready: Yes

Overview

Easily convert your AVI video files into the highly compatible MP4 format. This tool allows you to transcode your videos using modern codecs like H.264 or H.265, adjust audio settings, and fine-tune compression quality (CRF) to ensure seamless playback across all modern devices, browsers, and media players.

When to use

When you have legacy AVI video files that won't play on mobile devices, tablets, or modern web browsers.
When you need to compress large AVI files into a more efficient MP4 container to save storage space or reduce upload times.
When preparing video assets for web streaming or social media platforms that strictly require MP4 containers with H.264/AAC encoding.

How it works

1Upload your AVI video file (up to 500MB) into the converter.
2Select your preferred video and audio codecs, such as H.264 and AAC, or choose 'Copy' to change the container without re-encoding.
3Optionally set a CRF quality value between 0 and 51 to control the compression level, then click convert to generate your MP4 file.

Use cases

Converting old family videos recorded in AVI format to MP4 for easy sharing and playback on iPhones and Android devices.
Optimizing raw AVI video captures from legacy cameras into web-ready MP4 files using H.264 and AAC codecs.
Remuxing AVI files to MP4 containers instantly by copying the streams without re-encoding to save time and CPU power.

Examples

1. Optimizing Legacy AVI Videos for Web Streaming

Web Developer

Background

A developer needs to embed an old product demonstration video, currently in AVI format, onto a company landing page.

Problem

The AVI file is too large and does not play natively in modern HTML5 video players on browsers like Safari and Chrome.

How to use

Upload the AVI file, select 'H.264 (Recommended for MP4)' as the Video Codec, 'AAC' as the Audio Codec, and set the CRF Quality to 22.

Video Codec: libx264, Audio Codec: aac, CRF Quality: 22

Outcome

The video is converted to a highly compressed, web-compatible MP4 file that plays smoothly on all modern browsers.

2. Lossless Container Conversion

Video Editor

Background

An editor has an AVI file with compatible internal streams but needs it in an MP4 container for import into a specific editing suite.

Problem

Re-encoding the video would degrade the quality and take too much time.

How to use

Upload the AVI file, select 'Copy (No Re-encoding)' for both Video Codec and Audio Codec, then run the conversion.

FAQ

Can I convert AVI to MP4 without losing quality?

Yes, you can set the Video Codec and Audio Codec to 'Copy' to change the container format without re-encoding, preserving the original quality.

What is the recommended CRF quality range?

A CRF value between 18 and 28 is recommended, where lower values yield better quality but larger file sizes.

Which video codec should I choose for maximum compatibility?

H.264 (libx264) combined with AAC audio is highly recommended for universal compatibility across all modern devices and web browsers.

What is the maximum file size supported by this converter?

You can upload and convert AVI video files up to 500 MB in size.

Can I convert to H.265/HEVC using this tool?

Yes, you can select 'H.265/HEVC' (libx265) from the Video Codec options to achieve higher compression efficiency.

Video Codec: copy, Audio Codec: copy

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Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Optimizing Legacy AVI Videos for Web Streaming

2. Lossless Container Conversion

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