Video Conversion

Convert AVI to MP4 Offline — Make Old Videos Mobile-Ready

Convert AVI files to MP4 for playback on iPhones, Android devices, and smart TVs — entirely in your browser using FFmpeg with no upload needed.

4 min read 2026-03-22

AVI to MP4 — Browser Conversion

AVI is an old format that lacks mobile compatibility — iPhones, Android devices, and most smart TVs simply won't play AVI files. Converting to MP4 makes your videos playable on phones, tablets, smart TVs, and every modern platform. Our offline converter handles it entirely in your browser using FFmpeg.

AVI files don't play on most modern mobile devices or smart TVs. Converting to MP4 with H.264 solves compatibility instantly — and our browser-based tool means no upload is ever needed.

How to Convert AVI to MP4 Offline

1

Step 1: Select Your AVI File

Open your AVI video from your device. The file is processed locally in your browser — no upload to any server occurs.

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Step 2: Set Output Quality

Choose a quality preset — High preserves original resolution, Medium balances quality and file size, Low produces the smallest output for sharing.

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Step 3: Convert in Your Browser

FFmpeg.wasm transcodes the AVI to MP4 with H.264 video and AAC audio — all computation runs locally on your CPU, no server involved.

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Step 4: Download Your MP4

Save the converted MP4 directly to your device. It's ready to play on any device or share on any platform immediately.

Why AVI Files Need Converting

Mobile Incompatibility

iOS and most Android devices don't support AVI natively. Converting to MP4 makes home videos and recordings playable on every smartphone.

Large File Sizes

AVI files are often large because they use older, less efficient codecs. Converting to H.264 MP4 typically reduces file size by 50–70% at the same perceived quality.

Social Media Upload Limits

YouTube, Instagram, and WhatsApp prefer or require MP4. Converting your AVI files first ensures seamless uploads without rejection errors.

Why Convert Offline?

Private

Your video never leaves your device. No upload, no server, no data collection at any stage.

Fast

FFmpeg.wasm runs on your own CPU — no waiting for uploads or server queues.

Works Offline

Once the page loads, conversion works without any internet connection.

Convert AVI to MP4 — No Upload, No Registration

Runs entirely in your browser — no upload, no account, no waiting.

Convert AVI to MP4 Back to Blog

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