MPEG4 to AVI Converter
Processing entirely on your device — large files may take a moment.
MPEG4 is a common shorthand extension for MPEG-4 Part 2 streams — handled through the same MPEG program-stream path. Some legacy systems and DVR/camera devices only accept AVI input.
iLoveConverter processes everything locally on your computer, which makes it private and fast: no upload wait, no server storage, no limits. Add as many files as you like — batch conversion is built in.
How MPEG4 compares to AVI
| MPEG4 | AVI | |
|---|---|---|
| Compression | MPEG-1 / MPEG-2 | Legacy codecs (DivX/Xvid era) |
| Quality | Standard definition | Capped by its era |
| Compatibility | Universal decode | Legacy Windows tooling |
| Best for | Legacy disc and capture video | Reading old archives |
How to convert MPEG4 to AVI
- 1
Select your files
Drag & drop your MPEG4 files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to AVI". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted AVI file individually, or grab everything at once as a ZIP archive.
About the MPEG4 format
MPG (MPEG program stream) usually means MPEG-1 or MPEG-2 video — the codecs of VCD, SVCD and DVD, and of countless home video captures in the 1990s and 2000s. MPEG-1 tops out around VHS-grade 352×288; MPEG-2 delivers proper standard definition and still runs inside broadcast and DVD infrastructure.
Playback compatibility is its superpower: MPEG-1/2 decode paths exist in every player and hardware made this century. Quality-to-bitrate efficiency, however, is a generation behind H.264 — converting old MPG files to MP4 typically halves their size.
+Strengths
- ✓Decodes on essentially every player and device
- ✓Simple, battle-tested standard
!Limitations
- −Inefficient codecs by modern standards
- −MPEG-1 is VHS-grade at best
About the AVI format
AVI (Microsoft, 1992) is one of the oldest video containers still encountered. It has no native understanding of modern features — variable frame rates, modern codecs, subtitles, chapters — and stores everything through a 32-bit indexing system that caps reliable file sizes around 2 GB (OpenDML extensions patched some of this). Most AVIs you meet today are DivX/Xvid-era rips or old capture-card output.
There is no reason to produce AVI today; the realistic task is converting old libraries into MP4, which typically cuts file size by half or more at equal or better quality.
+Strengths
- ✓Opens in legacy Windows tooling
- ✓Simple structure, decades of player support
!Limitations
- −Obsolete: no modern codecs or features by design
- −Large overhead, ~2 GB practical ceiling
- −Codec zoo inside — playback is guesswork
Why convert MPEG4 to AVI?
There is a concrete reason this conversion exists: Inefficient codecs by modern standards AVI sidesteps that — Opens in legacy Windows tooling If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this MPEG4 to AVI converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Is there a file size limit for MPEG4 to AVI?
The only limit is your device's memory, since nothing is uploaded. Files up to a few hundred megabytes work fine on a modern desktop browser; very large files simply take a little longer.
Why is video conversion slower than image conversion?
Every frame has to be decoded and re-encoded. This site runs that work on your own CPU via WebAssembly — nothing is uploaded, but a multi-minute video reasonably takes a few minutes. Images, by comparison, are single-frame jobs.
Will the audio track be kept?
Yes. The audio is carried over and re-encoded to the standard audio codec of AVI, staying in sync with the video. If your MPEG4 file has multiple audio tracks, the first one is used.