FormatDrop
How-To Guide

How to Convert Xvid to MP4

Xvid is an open-source video codec from the early 2000s, similar to DivX, often used inside AVI containers. Converting Xvid to MP4 with H.264 modernizes the video for current devices and platforms — H.264 is more efficient (smaller files at the same quality) and universally compatible.

Open XVID to MP4 Converter

Step-by-step instructions

  1. 1

    Upload your Xvid file

    Select your .avi file with Xvid video. Most files distributed as 'XviD' from the 2000s P2P era are Xvid in AVI containers, often paired with MP3 audio.

    Go to converter
  2. 2

    Choose MP4 as output and codec settings

    Select MP4. The converter uses H.264 for video and AAC for audio. CRF 22 produces excellent quality at typical file sizes; lower CRF = higher quality.

  3. 3

    Download and test the MP4

    Play the MP4 on your phone, browser, or streaming device. The conversion produces a more efficient file (H.264 is ~30% better than Xvid at equivalent quality) that works everywhere.

Why convert XVID to MP4?

Xvid was the open-source alternative to DivX; MP4/H.264 became the alternative to both. Converting Xvid to MP4 brings P2P-era video into the streaming era.

Your files never leave your device

FormatDrop runs the conversion engine entirely inside your browser using WebAssembly. No file upload. No server. Nothing stored. You can verify this by opening DevTools → Network tab and watching: zero upload requests.

Frequently asked questions

Will the MP4 be larger or smaller than the Xvid?
Generally smaller at equivalent quality — H.264 is more efficient than Xvid. A 700 MB Xvid AVI typically becomes ~500 MB MP4 at the same visual quality. For the smallest possible size, use H.265: `ffmpeg -i input.avi -c:v libx265 -crf 24 output.mp4`.
FFmpeg command for Xvid to MP4?
`ffmpeg -i input.avi -c:v libx264 -crf 22 -c:a aac -b:a 192k output.mp4`. Or just remux without re-encoding (results in MP4 with Xvid inside, which most devices reject): `ffmpeg -i input.avi -c copy output.mp4`.
What about audio sync issues?
Some Xvid AVIs from the early 2000s have audio sync drift due to constant-bitrate audio with variable framerate video. Add `-async 1` to FFmpeg: `ffmpeg -i input.avi -async 1 -c:v libx264 -c:a aac output.mp4`.
Convert XVID to MP4 Now — Free

No account. No upload. Works in any browser.

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