Convert AVI to MP4
Free and instant — your AVI files are processed securely on our servers and deleted right after conversion. Nothing is stored.
How to convert AVI to MP4
- Step 01
Add your AVI files
Drop them into the box above or click to browse. You can add several files at once.
- Step 02
Conversion starts instantly
Your file is sent to our servers, converted and deleted right away — no sign-up, no queue, no waiting.
- Step 03
Download your MP4 files
Save each file individually or grab them all at once. Done.
Why convert AVI to MP4?
AVI is an old Microsoft format that many modern devices can't play and websites reject outright. Converting to MP4 dramatically shrinks the file and makes it play on any phone, browser, smart TV or social media platform.
AVI vs MP4 at a glance
AVI is Microsoft's original video container from 1992 — still common in older recordings, but large and not supported by browsers or modern streaming. MP4 is the universal video format — plays on every device, browser and platform without extra codecs.
| Property | AVI | MP4 |
|---|---|---|
| Extension | .avi | .mp4 |
| Full name | Audio Video Interleave | MPEG-4 Part 14 |
| First released | 1992 | 2001 |
| Developed by | Microsoft | ISO/IEC JTC 1 |
| Compression | Lossy | Lossy |
| Transparency | No | No |
| Animation | No | No |
| Best for | legacy video from older cameras and software | video sharing, streaming and playback on any device |
AVI to MP4 — frequently asked questions
Is this AVI to MP4 converter really free?
Yes — completely free, with no sign-up, no watermarks and no daily limits.
Will I lose quality converting to MP4?
MP4 uses lossy compression, so the image is re-encoded at high quality (92%). For photos the difference is practically invisible; for text-heavy graphics or logos, a lossless format like PNG preserves sharp edges better.
Why is my AVI so much larger than the MP4?
AVI often stores video with minimal compression. H.264 MP4 achieves 70–90% smaller files at near-identical visual quality.
Is the conversion private?
Video conversion runs on our servers with ffmpeg — your file is deleted immediately and never stored.