MP4 to AVI Converter
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Convert MP4 to AVI online
Convert MP4 to AVI for software that refuses anything newer. AVI is written with MPEG-4 Part 2 and MP3 audio rather than H.264, because that is what legacy AVI players and editors actually decode — a deliberate choice for compatibility over quality.
When should you convert MP4 to AVI?
- Import into an old Windows video editor
- Play on hardware from before H.264 was common
- Feed a tool or pipeline that only accepts AVI
- Meet a specification that names AVI explicitly
Before you convert
The file usually gets bigger
MPEG-4 Part 2 is a weaker codec than H.264. At comparable quality the AVI is typically larger than the MP4 it came from — this conversion trades efficiency for compatibility.
Only convert when something requires it
There is no scenario where AVI is the better format on merit. If the destination accepts MP4, leave it alone.
What happens to your file
MP4 to AVI is a full re-encode, not a container swap: the video is decoded and re-compressed with MPEG-4 Part 2 at qscale 5, and the audio is re-encoded to MP3 (libmp3lame) at VBR quality 4. AVI is written with the older MPEG-4 Part 2 codec rather than H.264, because that is what legacy AVI players and editors actually decode. It is a weaker codec: at matching quality the file is usually larger than the H.264 original.
Settings this conversion runs with
| Engine | ffmpeg |
|---|---|
| Video codec | MPEG-4 Part 2 |
| Video quality | qscale 5 |
| Audio codec | MP3 (libmp3lame) |
| Audio bitrate | VBR quality 4 |
What changes
- The MP4 picture is decoded and re-compressed with MPEG-4 Part 2, so this is a generation loss: the output is built from an already-compressed source, not from the original camera data. Converting MP4 to AVI and back will soften the clip a little more each time.
- Only one video and one audio stream reach the AVI file. Additional audio languages, embedded subtitle tracks, and chapter markers are not carried across.
About MP4 and AVI files
MP4 video
Strengths
- plays almost everywhere
- good quality-to-size
- widely supported
Limitations
- lossy compression
- less flexible than MKV
AVI video
Strengths
- widely recognized
- simple container
Limitations
- large files
- dated format
MP4 vs AVI
| Format | MP4 | AVI |
|---|---|---|
| Compression | Lossy | Lossy |
| Transparency | — | — |
| Best for | streaming and sharing, playback on any device | legacy Windows video, older recordings |
Guides for this conversion
- MP4, MKV, MOV, WebM: containers vs codecs
The file extension on a video tells you the container, not how the video is compressed. Understanding the difference explains why some conversions are instant and others take minutes.
Related tools
Frequently asked questions
- Does converting MP4 to AVI re-encode the file?
- MP4 to AVI is a full re-encode, not a container swap: the video is decoded and re-compressed with MPEG-4 Part 2 at qscale 5, and the audio is re-encoded to MP3 (libmp3lame) at VBR quality 4. AVI is written with the older MPEG-4 Part 2 codec rather than H.264, because that is what legacy AVI players and editors actually decode. It is a weaker codec: at matching quality the file is usually larger than the H.264 original.
- What should you know before converting MP4 to AVI?
- The MP4 picture is decoded and re-compressed with MPEG-4 Part 2, so this is a generation loss: the output is built from an already-compressed source, not from the original camera data. Converting MP4 to AVI and back will soften the clip a little more each time.
- Is this MP4 to AVI converter free?
- Yes. You can convert MP4 to AVI online for free, with no account and no watermark.
- Do I need to install software or sign up?
- No. Use the converter from your browser without installing software or creating an account. Files are uploaded to our servers for processing.
- Will converting MP4 to AVI reduce quality?
- AVI uses lossy compression, so the file can get smaller while some visual quality may change.
- Are my files safe?
- Yes. Files are processed only to complete the conversion and are auto-deleted after 2 hours. We never share them.