Convert MP4 to AVI online

To convert MP4 to AVI, upload the MP4 file, start the conversion and download the result: Converter.now writes an AVI with Xvid (MPEG-4 Part 2) video and MP3 audio. The first video and audio tracks are re-encoded; extra audio tracks and embedded subtitles are not copied. Both formats are lossy, so this adds a second round of compression; convert from the best original you have rather than an earlier export.

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MP4 to AVI at a glance

Converts: MPEG-4 video → AVI video container
Output: An AVI with Xvid (MPEG-4 Part 2) video and MP3 audio
Compression: MP4: lossy → AVI: lossy
Engine: FFmpeg
Privacy: Private download link; files are deleted after 6 hours. No account needed.

Timed-stream transcoding: How MP4 becomes AVI

Converter.now decodes the picture, sound, and timing streams carried by MP4, then writes the codec and container profile used for AVI. Duration can remain identical while compression, channel mapping, frame cadence, metadata, or auxiliary streams change. MP4 demultiplexing follows track, sample, edit, and fragment tables to inventory codecs, rotation, language, chapters, captions, and synchronization data. AVI output interleaves indexed audio and video chunks in a legacy RIFF container whose subtitle, modern metadata, and variable-frame-rate behavior is limited.

Decoded media - A broadly supported MPEG-4 container written here with H.264 video and AAC audio when those streams exist. Encoded delivery profile - An older Microsoft media container commonly paired here with Xvid video and MP3 audio.

For related jobs, compare other MP4 converters with the full list of AVI conversions.

Before converting a whole batch, read containers vs. codecs; it explains why a familiar extension can still fail to play.

MP4

MPEG-4 video

Used for widely compatible web and device video.

Family: Video
MIME: video/mp4

→

AVI

AVI video container

Designed for recorded motion video with an accompanying soundtrack.

Family: Video
MIME: video/x-msvideo

Reading MP4 correctly and satisfying what AVI expects

What can fail when MPEG-4 video is interpreted

An audio-only source does not gain pictures, and ancillary streams such as captions may not carry over.

What AVI video container cannot safely promise

AVI has limited support for modern metadata, captions, variable frame rates, and some web players.

How the AVI writer handles this route

The verified AVI profile uses Xvid video and MP3 audio for compatibility with older AVI workflows.

Acceptance evidence for the converted AVI

Record the MP4 evidence before conversion

Test playback, seeking, audio sync, dimensions, and whether the expected video stream actually exists.

Test the AVI file in its receiving workflow

Test seeking and audio sync in the target player, not only the opening frame.

The delivery decision for this MP4 to AVI route

Choose AVI only after the player, editor, or publishing service confirms its container and codecs; keep MP4 if extra tracks or source encoding must survive.

What changes between the MP4 model and the AVI deliverable

The first video and audio tracks are re-encoded; extra audio tracks and embedded subtitles are not copied.
Both formats are lossy, so this adds a second round of compression; convert from the best original you have rather than an earlier export.
MP4 and AVI use different metadata conventions, so application-specific fields should be treated as optional until verified.