AVI to MP4 Converter

1. Upload your AVI file (up to 500 MB).
2. Click 'Convert AVI to MP4' — takes 30 seconds to 3 minutes.
3. Download the MP4 — playable on every device.

AVI is a legacy Windows video format from 1992 — MP4 is the universal modern standard. Converting AVI to MP4 makes your video play on every phone, tablet, TV, and streaming platform.

AVI is a legacy Windows video format from 1992. It's still common in older video collections, camcorder recordings, and some Windows workflows. But AVI doesn't play on phones, tablets, or most modern devices. Converting to MP4 (H.264 + AAC) makes your video universal — playable on every device and accepted by every platform.

The converter decodes the AVI container, re-encodes the video as H.264 and the audio as AAC, and packages them in an MP4 container. Quality is preserved at high bitrates, and file size often shrinks because H.264 is more efficient than legacy AVI codecs.

• Converting old AVI videos for phone playback.
• Uploading AVI to YouTube or social media (MP4 required).
• Making legacy camcorder footage playable on modern devices.
• Shrinking large AVI files without losing quality.
• Preparing AVI for video editing workflows.
• Sharing AVI videos with people who don't support AVI.
• Standardizing an AVI archive to MP4.

AVI → MP4 preserves visual quality while often reducing file size (H.264 is more efficient than legacy AVI codecs). At high bitrates, the output is visually indistinguishable from the source.

• Multiple audio tracks are reduced to the first track.
• Subtitles and chapters are not preserved.
• Some legacy AVI codecs (Indeo, Cinepak) may not decode.
• Very large files (500+ MB) may take several minutes.
• DRM-protected AVI files can't be converted.

• Output MP4 plays on every device, OS, and platform.
• Accepted by YouTube, Facebook, Instagram, TikTok, Twitter.
• Works with QuickTime, VLC, Windows Media Player, all phones.
• Editable in Premiere, Final Cut, DaVinci, iMovie.
• Standard MP4 — no special software needed.

• H.264 + AAC is the most universally compatible combination.
• File size often shrinks because MP4 is more efficient than AVI.
• For 4K AVI files, conversion may take several minutes.
• Keep the original AVI if you may need it later.
• For older AVI codecs (Indeo, Cinepak), conversion may fail.

Conversion fails or output is corrupted

The AVI may use a rare legacy codec (Indeo, Cinepak, etc.). Try a different AVI or re-encode with VLC first.

Audio is out of sync

Some AVI files have variable frame rates that confuse converters. Re-encode the AVI with VLC first, then convert.

File size increased

Rare — MP4 is normally more efficient. If the source used a very efficient legacy codec, output may be slightly larger. Try a lower video bitrate setting.

• Microsoft — AVI Format
• MPEG — MP4 Specification