AVI to MP4 Converter

About this converter

AVI is one of the oldest video containers still in circulation - Microsoft introduced it in 1992. It usually holds older codecs like DivX, Xvid, or MPEG-4 Part 2, which means AVI files tend to be large and do not play well on modern phones, browsers, or streaming devices.

Converting AVI to MP4 (H.264) almost always involves re-encoding, because AVI's codecs rarely match what MP4 uses - that is different from MOV or MKV, which can often just be repackaged. Re-encoding takes a little longer, but the payoff is real: the MP4 is typically much smaller than the original AVI at comparable quality, and it plays everywhere.

AVI to MP4: good to know

• Expect a smaller file: H.264 is far more efficient than the codecs in most AVIs, so your MP4 often shrinks by half or more.
• Quality control: because this is a re-encode, the quality setting matters. Use High to stay close to the source; Medium or Low trade detail for a smaller file.
• It takes longer than a remux: AVI must be decoded and re-encoded frame by frame, so give larger clips a moment.

How it works

1. Drop your file(s) in the box above (or click to browse).
2. Make sure MP4 is selected as the output.
3. Click Convert, then Download your file.

Frequently asked questions

How do I convert AVI to MP4?

Drop your AVI file above, make sure MP4 is the output, optionally pick a resolution and quality under Options, then click Convert and Download.

Why does AVI to MP4 take longer than other conversions?

AVI typically uses older codecs (DivX, Xvid, MPEG-4 Part 2) that are not MP4-compatible, so the file must be fully re-encoded to H.264 rather than simply repackaged. Re-encoding is more work than a remux.

Will my MP4 be smaller than the AVI?

Usually yes. H.264 compresses far more efficiently than the codecs in most AVI files, so the MP4 is often significantly smaller at similar quality.

Will I lose quality converting AVI to MP4?

Re-encoding is lossy by nature, but at the High quality setting the difference is hard to notice. Lower settings shrink the file further at the cost of some detail.

Can I convert several AVI files at once?

Yes. Drop multiple files into the box and EasyConvert converts them in a batch, then lets you download them together as a ZIP.

Related conversions

MKV to MP4MOV to MP4WebM to MP4WMV to MP4