AVI to MP4 — No Upload, No Watermark

Why convert AVI to MP4?

AVI belongs to an era before streaming. Old camcorder footage and archived recordings sit in files that phones won't play and browsers won't touch — MP4 brings them into the present at a fraction of the size.

AVI is a Microsoft container from 1992. Old camcorders, screen recorders and archives are full of it, but it lacks modern streaming features and produces large files.

When AVI → MP4 is the right move

Rescuing old camcorder or screen-capture archives for modern devices.
Uploading legacy footage to YouTube or a website.
Shrinking a video archive that is eating disk space.

Quality, size and what changes

Re-encoding to H.264 typically cuts the file to a third or less of the AVI, with no visible loss at sensible settings. Because it is a genuine re-encode rather than a rewrap, longer clips take real processing time.

What you gain with MP4: Plays everywhere, streams well and is hardware-accelerated on virtually all devices.

How it works

Drop your AVI file above and Morphio decodes it locally, then re-encodes it as MP4 using WebAssembly + the browser's native codecs. Nothing is ever uploaded — your files stay on your device. Batch as many files as your machine can handle. See exactly how in-browser conversion works.

AVI to MP4 — frequently asked questions

How do I convert AVI to MP4 without uploading the file?

Open the AVI to MP4 page, drop your video on the drop zone and press convert. Morphio runs an FFmpeg build compiled to WebAssembly that runs inside the page, so the AVI data never leaves your device and no server ever receives a copy.

Does converting AVI to MP4 lose quality?

Audio and video tracks are re-encoded together, so the result stays in sync and plays on standard players. Converting AVI to MP4 only rewrites the container and encoding you asked for — the source file on your disk is never modified.

Is the AVI to MP4 converter free, and how big can the file be?

Yes. The free plan covers 10 conversions a day with files up to 200 MB and adds no watermark or sign-up. Morphio Pro ($5/month, or $29 once for lifetime access) removes the daily cap and raises the per-file limit to 5 GB.

Why won't my AVI play on my phone?

Phones support a narrow set of modern codecs; older AVI files often use codecs no mobile device ships with.

Will the file get smaller?

Almost always, and often dramatically — modern H.264 compression is far ahead of what old AVI encoders managed.

AVI to MP4 Converter

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