How to use the AVI to MP4 converter
- Choose your AVI video or drop it on the box.
- Check the settings. "Same as original" resolution is fastest and lets fast mode copy compatible videos without re-encoding. Lower it to 720p for a smaller file.
- Click "Convert to MP4". A progress meter shows how far along it is.
- Download your MP4.
Why convert AVI to MP4?
AVI files are big and do not play on phones or in browsers. MP4 with H.264 is usually several times smaller at the same quality and plays everywhere.
- AVI: large files compared with modern formats.
- MP4: plays almost everywhere.
- MP4: good quality at small sizes with H.264.
AVI video (DivX/XviD) must be re-encoded, so a long AVI takes a while in the browser. 720p is much quicker than 1080p.
AVI vs MP4
| AVI | MP4 | |
|---|---|---|
| Full name | Audio Video Interleave | MPEG-4 Part 14 |
| Type | Video | Video |
| Created by | Microsoft (1992) | Moving Picture Experts Group (MPEG) (2001) |
| Compression | Lossy | Lossy |
| Typical codecs | MPEG-4 Part 2 (DivX/XviD) + MP3 | H.264 + AAC |
| Best for | Older camera clips, legacy video archives and Windows software | Sharing videos online, phone recordings, social media uploads and streaming |
| Plays on | Windows Media Player, VLC and most desktop players; phones and browsers often refuse AVI | Windows, macOS, iPhone, Android, smart TVs, game consoles and every modern browser |
Does converting AVI to MP4 lose quality?
AVI (MPEG-4 Part 2 (DivX/XviD)) has to be re-encoded to MP4 (H.264). At "Balanced" quality the difference is very hard to see; choose "High" for footage you will edit again.
How long does it take?
Re-encoding video uses your device's processor. A short clip takes seconds; a 10-minute 1080p video can take several minutes. Choosing 720p makes it 2–3 times faster.
What is an AVI file?
AVI is one of the oldest video containers, introduced by Microsoft with Windows 3.1 in 1992. Older digital cameras, DVD rips and many 2000s downloads are AVI files, usually with DivX or XviD video and MP3 sound.
What is an MP4 file?
MP4 is a container that usually holds H.264 or H.265 video with AAC sound. It is built on Apple's QuickTime file structure and became an ISO standard in 2001. Because almost every phone, browser, TV and editing app can play it, MP4 is the safest choice when you need a video to just work.
Frequently asked questions
Do I have to pay or sign up to use the AVI to MP4 converter?
No. There is no account, no payment and no watermark. The only limit is 1 GB per file, set by what browsers can handle.
Do you keep a copy of my files?
We never receive them. All processing happens on your device, so there is nothing for us to store or delete.
Will the MP4 sound and look as good as the AVI?
AVI (MPEG-4 Part 2 (DivX/XviD)) has to be re-encoded to MP4 (H.264). At "Balanced" quality the difference is very hard to see; choose "High" for footage you will edit again.
Can I convert MP4 back to AVI?
Yes, use the MP4 to AVI converter.
An AVI will not play on a phone or in a browser. What should I do?
Convert it to MP4 for universal playback.
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other modern mobile browsers. Short files work best on phones; for long or high-resolution videos a computer is faster.