Convert AVI to MP4
Select Files
Audio, Video and Image supported. Drag or click
Looking for a reliable AVI to MP4 converter that works in any browser? Drag your AVI files into WeLoveConvert and download MP4 in seconds — no waiting queues, no email signup.
How It Works
Open the Upload Zone
Click anywhere in the upload area to browse your computer, or simply drag AVI files in from your desktop.
Quick Browser Conversion
WeLoveConvert processes your files in seconds using your device hardware — no server queues, no slow uploads.
Ready to Download
Your converted MP4 files appear in the download list as they finish. Save them locally with one click.
About These Formats
AVI is a Microsoft container from 1992 that usually wraps old codecs like Xvid, DivX, or uncompressed video — and when you convert AVI to MP4, you typically cut file size by 60% to 80% just by switching to modern H.264 encoding. Old camcorder archives, captured TV recordings, classroom clips, and downloaded movies frequently arrive as AVI and choke on phones, smart TVs, or social uploads. MP4 with H.264 video and AAC audio is the safe modern target: it plays on iOS, Android, Apple TV, Roku, every browser, and uploads cleanly to YouTube, Vimeo, and Instagram. Beyond size, you also gain proper streaming support — AVI cannot do progressive download or adaptive streaming, while MP4 with the faststart flag streams instantly. WeLoveConvert performs the transcode entirely in your browser using WebAssembly FFmpeg, so even multi-gigabyte AVI archives never get uploaded anywhere. For a clean modernization, choose a CRF between 20 and 24, keep the original frame rate, and let the encoder convert the audio track to 192 kbps AAC for compatibility across every modern device.
Frequently Asked Questions
How do I convert AVI to MP4?expand_more
Upload your files, confirm the conversion settings, and download your converted files. All processing happens in your browser — no server upload required.
Is this AVI to MP4 converter free?expand_more
Yes, completely free with no hidden fees. No sign-up required, no usage limits. All conversion happens in your browser.
Is it safe to convert AVI to MP4 online?expand_more
Your files never leave your device. All conversion happens locally in your browser using WebAssembly technology. We have zero access to your files.
Will I lose quality converting AVI to MP4?expand_more
Quality depends on the target format and your settings. Lossless formats like PNG preserve original quality. For lossy formats like JPG, you can adjust the quality slider.
Can I convert multiple AVI files at once?expand_more
Yes, you can convert multiple files at once. Simply drag all your files into the upload area or click to select them.
Common Issues
- infoLegacy DivX or Xvid sources may show compression artifacts that the H.264 re-encode cannot remove or hide.
- infoFile size typically drops 50% to 80% but very low-bitrate AVI sources can look softer after re-encoding.
- infoAVI variable frame rate sources may cause audio drift in the resulting MP4 — force a constant frame rate first.
- infoOld MP3 audio tracks inside AVI are re-encoded to AAC, slightly altering tonal balance at low bitrates.