AVI to MP4 — Bring Legacy Video Into the Present
AVI dates to 1992 and it shows. Files are large, playback support keeps eroding, and modern phones and platforms often will not touch them. Converting to MP4 makes an old archive playable and shareable again, and MediaVault does it without those files ever leaving your machine.
Why AVI files are so large
AVI predates modern compression. Video inside an AVI is frequently stored in older codecs, sometimes barely compressed at all, which is why a short clip can occupy hundreds of megabytes. Re-encoding to H.264 inside an MP4 usually cuts the size dramatically while looking the same or better.
This one is a real conversion
Unlike MKV or MOV, an AVI usually holds a codec that MP4 cannot carry, so the video genuinely has to be decoded and re-encoded. That takes longer and is technically lossy, though re-encoding from an old, lightly compressed source to modern H.264 is generally invisible in practice and hugely more efficient.
- Expect a real encode rather than an instant copy
- Expect the file to get substantially smaller
- Old low-resolution footage will not gain detail — nothing can add what was never recorded
How to convert AVI to MP4
- Add your AVI file. Open the converter and drop it in — nothing is uploaded.
- Select MP4. Choose it as the output format.
- Convert and download. The result saves straight to your device.
Frequently asked questions
Why does AVI to MP4 take longer than MKV to MP4?
AVI usually holds a codec MP4 cannot carry, so the video must be decoded and re-encoded rather than simply copied into a new container.
Will my old video look better after converting?
No. Conversion cannot add detail that was never captured. It makes the file playable and much smaller, but the source resolution and quality are the ceiling.
Can I convert a whole archive of old files?
Yes, one at a time. Since processing is local there is no upload wait or per-file size limit.