AVI to MP4 Converter

Convert legacy AVI videos to modern MP4 format for playback on phones, tablets, web players and social platforms. Processing runs locally in your browser.

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Files stay on your device

MP4 · MOV · WebM · MKV · AVI

No upload required100% free foreverWorks in your browser
How it works

AVI to MP4 Converter for private browser workflows

Modernize old video files

AVI is a decades-old container that many modern devices and platforms cannot play. Convert to MP4 (H.264) for universal compatibility and often smaller file sizes.

Compress while converting

AVI files often use inefficient codecs. Converting to MP4 with modern encoding typically reduces file size significantly while maintaining visual quality.

Private local processing

Your AVI file is converted entirely on your device. Family archives and personal recordings never leave your browser.

Common use cases

Convert old camcorder and VHS capture files from AVI to MP4 for modern playback and sharing.

Digitized archives

Make AVI files playable on iPhone and Android without installing extra codecs.

Phone playback

Prepare AVI clips for embedding on websites and uploading to video platforms.

Web publishing

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FAQ

AVI to MP4 Converter FAQ

Answers for the most common questions about this tool, supported workflows, and local browser processing.

No uploadFree toolBrowser-based
Is converting AVI to MP4 free?

Yes. LessMB converts AVI to MP4 for free in your browser without requiring an account.

Will the MP4 be smaller than the AVI?

Usually yes. AVI often uses older, less efficient codecs. Modern H.264 encoding in MP4 typically produces much smaller files at similar quality.

Are files uploaded to a server?

No. The conversion runs locally in your browser. Your video stays on your device.