Xvid Converter — Convert Xvid AVI Videos to MP4 Online Free

Convert Xvid-encoded AVI videos to modern H.264 MP4 format directly in your browser. Selectable quality presets, no upload needed — powered by FFmpeg WebAssembly.

Drag & drop or click to upload

Supports .avi (Xvid-encoded)

Good quality with reasonable file size. CRF 23 (default).

Result

Upload an Xvid AVI file and hit convert to generate your MP4.

Xvid AVI → MP4 in Your Browser

Xvid was one of the dominant video codecs of the 2000s, but modern devices can no longer play it natively. Convert your old Xvid AVI collection to universally compatible H.264 MP4 format right in your browser — no software, no upload, full privacy.

Xvid AVI → H.264 MP4

Key Features

Xvid & AVI Support

Handles Xvid-encoded AVI files and any other AVI container regardless of the internal video codec used.

CRF Quality Control

Select from quality presets that map to H.264 CRF values — balance file size against visual quality for your needs.

100% Private

All conversion runs locally via FFmpeg WebAssembly in your browser. Your video files never touch any server.

Universal MP4 Output

Output is H.264/AAC MP4 — compatible with all smart TVs, phones, tablets, streaming services, and video editors.

Common Use Cases

Old Movie Collection

Convert classic Xvid movie files from the 2000s to play on modern smart TVs and streaming devices

Video Editing

Prepare Xvid AVI files for video editors like Premiere Pro and DaVinci Resolve which prefer H.264 MP4 input

Digital Archiving

Modernise your personal video archive by converting old Xvid files to the long-term compatible MP4 format

How this Xvid Converter works

Xvid is an open-source implementation of the MPEG-4 ASP codec, stored inside AVI containers. Modern devices dropped MPEG-4 ASP support in favour of H.264, so Xvid files require re-encoding to play on current hardware. This converter handles that transcoding entirely within your browser using FFmpeg WebAssembly.

After upload, FFmpeg reads the AVI container and identifies the Xvid video stream and the MP3 audio stream that most Xvid files carry. The tool does not attempt a re-mux here — Xvid cannot transfer into MP4 directly without re-encoding because H.264 and MPEG-4 ASP are different codec families. The video stream is decoded from Xvid and re-encoded using libx264 at a CRF value you select: CRF 18 for high quality with larger files, CRF 23 for a balanced output, or CRF 28 for the smallest file at reduced quality. The audio stream is decoded from MP3 and re-encoded to AAC at 192 kbps using FFmpeg's native AAC encoder.

The -movflags +faststart flag applied to the output makes the MP4 streamable without full download. MPEG-4 ASP decoding is computationally expensive in a WASM context, so conversion time scales with video length — a 90-minute Xvid file may take 5–10 minutes. All processing stays in your browser with no server upload.

How to use this Xvid Converter

1

Upload Xvid / AVI File

Drag and drop or click to select your Xvid-encoded AVI video file from your computer.

2

Set quality preference

Choose the CRF quality level to control the balance between output file size and visual quality.

3

Convert & download

Click Convert to MP4, monitor the progress bar, and download your finished file.

Example Usage

A classic Xvid-encoded AVI movie re-encoded to H.264 MP4 for playback on a modern smart TV and streaming platforms.

Input
movie.avi (693 MB, 01:32:00, Xvid/MP3)
Output
movie.mp4 (820 MB, H.264/AAC, CRF 23)

Frequently Asked Questions

What is Xvid?
Xvid is an open-source video codec based on the MPEG-4 ASP standard. It was highly popular in the early-to-mid 2000s for compressing DVD-quality video into smaller files. Most Xvid videos are stored inside AVI container files.
Why is my Xvid video not playing on modern devices?
Modern smartphones, smart TVs, and streaming platforms have dropped support for the MPEG-4 ASP codec that Xvid uses in favour of newer codecs like H.264 and H.265. Converting to MP4 with H.264 restores full playback compatibility.
Will re-encoding Xvid to MP4 reduce quality?
Some quality reduction occurs during re-encoding because Xvid is already a compressed format. However, at a reasonable CRF value, the output MP4 will look nearly identical to the source while being playable on all modern devices.
Does this tool support AVI files with other codecs?
Yes. The tool accepts any AVI file regardless of the internal codec. FFmpeg identifies the codec automatically and re-encodes the video stream to H.264 and the audio to AAC, producing a universally compatible MP4.
Is my video file uploaded anywhere?
No. The entire conversion runs locally in your browser using FFmpeg WebAssembly. Your video files are never uploaded to any server, ensuring complete privacy for your personal video collection.
What output format does the converter produce?
This tool outputs MP4 files with H.264 video and AAC audio — the most widely supported combination across all major platforms, devices, streaming services, and video editors.
Can I convert multiple Xvid files at once?
Currently, the tool processes one file at a time. For batch conversion, you can convert each file sequentially within the same browser session. The FFmpeg engine remains loaded after the first conversion, so subsequent conversions start faster.
How long does Xvid to MP4 conversion take?
Conversion time depends on the file size, video length, and your computer's CPU speed. A typical 700 MB Xvid movie takes around 3 to 8 minutes on a modern laptop. The first conversion also includes a one-time FFmpeg engine download of about 30 MB.
What happens to the audio track during conversion?
Xvid AVI files typically use MP3 audio. The converter re-encodes the audio stream to AAC at 192 kbps, which is the standard audio format for MP4 files and ensures compatibility with all devices and media players.
Will the subtitles inside my AVI file be preserved?
Soft subtitles embedded in AVI are generally not preserved during the container conversion because the MP4 format handles subtitle tracks differently. For subtitles, you can add an external SRT file to your MP4 using a video editor after conversion.

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The Xvid Converter is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.

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