Convert MP4 to AVI online in seconds — free, with no sign-up. AVI is lossy and ideal for legacy video; usually converted to MP4 or WebM. Your files are encrypted and deleted automatically after 24 hours.
MP4
MPEG-4 (H.264) — The universal video container — plays on virtually every device, browser and platform.
AVI
Audio Video Interleave — An older Microsoft container with large file sizes and limited modern support.
How to convert MP4 to AVI
- 1Upload your MP4 file
Click “Choose a file” or drag and drop your MP4 file onto the page — no sign-up or email needed.
- 2Convert to AVI
AVI is already selected as the output. Open Options to fine-tune quality if you like, then click Convert.
- 3Download your AVI file
Your AVI file is ready in seconds — click Download to save it. Files are automatically deleted after 24 hours.
MP4 vs AVI
| MP4 | AVI | |
|---|---|---|
| Full name | MPEG-4 (H.264) | Audio Video Interleave |
| Type | Video | Video |
| Compression | Lossy | Lossy |
| Best for | sharing and publishing video anywhere | legacy video; usually converted to MP4 or WebM |
Frequently asked questions
Does converting MP4 to AVI lose quality?
Both MP4 and AVI use compression, so re-encoding discards a little more data. For a single conversion the change is virtually invisible; just avoid repeatedly re-converting the same file.
What's the difference between MP4 and AVI?
MPEG-4 (H.264) (MP4) is lossy and best for sharing and publishing video anywhere. Audio Video Interleave (AVI) is lossy and best for legacy video; usually converted to MP4 or WebM. Convert MP4 to AVI when you need a video for legacy video.
Is the MP4 to AVI converter free?
Yes — converting MP4 to AVI is completely free. There's no watermark, no sign-up and no email required, and you can convert as many files as you like.
Are my MP4 files private and secure?
Yes. Your uploads are encrypted in transit, processed privately, and automatically deleted within 24 hours. We never share, sell or look at your files.
Can I convert MP4 to AVI on iPhone, Android, Mac or Windows?
Yes. The converter runs entirely in your browser, so it works on any device — iPhone, iPad, Android, Mac, Windows or Linux — with nothing to download or install.
How long does it take to convert MP4 to AVI?
Most files convert in a few seconds. Larger files take a little longer, and your upload speed is usually the limiting factor. There's no queue and no waiting for an email.
What else can I convert MP4 files to?
Besides AVI, you can convert MP4 to AAC, FLAC, FLV, GIF, JPG, M4A and more — see the full list of MP4 conversions below.
Other conversions
Last updated July 2026