🎬 Video Converter

AVI to MP4 Converter — Free & Private

Rescue old camcorder footage and Windows Movie Maker exports from the 2000s. Convert DivX, Xvid, and MJPEG-encoded AVI files to H.264 MP4 — playable on every iPhone, smart TV, and social platform. No upload, ever.

⚡ Convert AVI to MP4 Now Browse All Tools

✓ Free forever ✓ No upload ✓ No signup ✓ FFmpeg-powered

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Ready to modernize your AVI files?

100% in your browser · FFmpeg.wasm · Your footage never leaves your device

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Why AVI Files Stop Playing on Modern Devices

AVI (Audio Video Interleave) was introduced by Microsoft in 1992 — making it older than the web itself. It became the default export format for MiniDV camcorders, Windows Movie Maker, and DVD-ripping tools throughout the 2000s. The problem isn't the container itself — it's the codecs trapped inside. DivX and Xvid were revolutionary for their era, compressing VHS-quality footage onto CD-Rs. But Apple blocked these codecs from iOS entirely, and modern smart TVs, streaming platforms, and social media all expect H.264. Converting to MP4 re-encodes your footage with today's standard codec — cutting file size by up to 90% and making videos playable on every device made in the last decade.

📱 iPhone & iPad compatible — H.264 MP4 plays natively on every Apple device without extra apps
📉 3–10× smaller files — H.264 is dramatically more efficient than DivX, Xvid, or MJPEG
📺 Smart TV ready — MP4/H.264 is the universal standard for Samsung, LG, and Sony TVs
🎞️ YouTube & Instagram ready — upload directly with no slow re-processing on the platform
▶️ Streaming supported — MP4 supports progressive download; AVI requires full download before playback
🔒 100% private — FFmpeg.wasm runs in your browser; no footage ever touches a server

How to Convert AVI to MP4

Open the Converter

Click "Convert Now" to open the video converter with AVI → MP4 pre-selected.

Load Your AVI File

Drag & drop your AVI or click Browse. Works with DivX, Xvid, MJPEG, and other AVI variants.

Convert in Browser

FFmpeg.wasm re-encodes your video to H.264 MP4 entirely in your browser — no server upload.

Download MP4

Your MP4 downloads automatically, ready for phones, TVs, YouTube, and social media.

Features

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100% Private

FFmpeg.wasm runs locally. Your footage never leaves your device.

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Multi-Codec AVI

Handles DivX, Xvid, MJPEG, and uncompressed AVI from any era.

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Free Forever

No account, no fee, no watermarks. Convert as many files as you need.

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Massive Size Reduction

H.264 encoding cuts file size by 60–90% versus old AVI codecs.

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Universal Output

MP4/H.264 plays on every device, OS, and platform without extra software.

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Audio Preserved

Audio re-encodes to AAC — the standard audio format for MP4 files.

Frequently Asked Questions

Old AVI files use DivX or Xvid codecs from the early 2000s. Apple devices don't support these codecs. Converting to MP4 (H.264) gives you universal compatibility across all modern devices.

Yes, significantly. Old AVI files encoded with DivX, Xvid, or MJPEG are typically 3–10× larger than equivalent H.264 MP4. A 2 GB AVI can become 200–500 MB as MP4 at the same visual quality.

Yes. Old MiniDV and DV camcorder exports as AVI convert perfectly to MP4. The conversion re-encodes using modern H.264 compression, making files smaller and universally compatible.

YouTube accepts AVI, but recommends MP4. AVI uploads often take longer to process on YouTube's servers and can result in lower quality output. Converting to MP4 before uploading gives better results.

Windows Movie Maker's default AVI output uses Windows Media Video codec. Convert to MP4 to share on social media, email, or any modern platform.

It depends on file size and your device. A 500 MB AVI typically converts in 2–5 minutes in a browser. Older, slower devices may take longer.

No. FFmpeg.wasm handles conversion entirely in your browser. Your video files never leave your device.