Convert AVI to MP4 online in seconds — free, with no sign-up. MP4 is lossy and ideal for sharing and publishing video anywhere. Your files are encrypted and deleted automatically after 24 hours.
AVI
Audio Video Interleave — An older Microsoft container with large file sizes and limited modern support.
MP4
MPEG-4 (H.264) — The universal video container — plays on virtually every device, browser and platform.
How to convert AVI to MP4
- 1Upload your AVI file
Click “Choose a file” or drag and drop your AVI file onto the page — no sign-up or email needed.
- 2Convert to MP4
MP4 is already selected as the output. Open Options to fine-tune quality if you like, then click Convert.
- 3Download your MP4 file
Your MP4 file is ready in seconds — click Download to save it. Files are automatically deleted after 24 hours.
AVI vs MP4
| AVI | MP4 | |
|---|---|---|
| Full name | Audio Video Interleave | MPEG-4 (H.264) |
| Type | Video | Video |
| Compression | Lossy | Lossy |
| Best for | legacy video; usually converted to MP4 or WebM | sharing and publishing video anywhere |
Frequently asked questions
Does converting AVI to MP4 lose quality?
Both AVI and MP4 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 AVI and MP4?
Audio Video Interleave (AVI) is lossy and best for legacy video; usually converted to MP4 or WebM. MPEG-4 (H.264) (MP4) is lossy and best for sharing and publishing video anywhere. Convert AVI to MP4 when you need a video for sharing and publishing video anywhere.
Is the AVI to MP4 converter free?
Yes — converting AVI to MP4 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 AVI 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 AVI to MP4 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 AVI to MP4?
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 AVI files to?
Besides MP4, you can convert AVI to AAC, FLAC, FLV, GIF, JPG, M4A and more — see the full list of AVI conversions below.
Other conversions
Last updated July 2026