Convert AVI to MP4 Online — Free AVI to MP4 Converter

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Convert AVI to MP4 — Smaller Files, Universal Playback

AVI files are relics of an older era — bloated, poorly compressed, and incompatible with most modern devices. Converting AVI to MP4 slashes file size by up to 80% while making your videos playable on every phone, tablet, TV, and social platform. Klipa handles the conversion entirely in the cloud, so even a low-powered laptop can process large AVI files.

Have a collection of old AVI recordings? Convert them here, then use our compressor to shrink them further for archiving. If you need to add subtitles to legacy footage, the MP4 format is fully supported by our AI tools.

How to Convert AVI to MP4

Step 1

Upload Your AVI File

Drag and drop your AVI file — we support common AVI codecs including DivX, Xvid, and uncompressed video. Files up to 500 MB without an account, 1 GB with a free account, 5 GB on Pro (20 GB on Studio). For oversized files, compress first.

Step 2

Automatic MP4 Conversion

Our server re-encodes your AVI using modern H.264 encoding, dramatically reducing file size while preserving visual quality. Audio is converted to AAC for universal compatibility. The process typically completes quickly.

Step 3

Download Your MP4

Your converted MP4 is ready to share, upload, or edit. Want to take it further? Add AI subtitles, convert to another format, or compress it even more.

Why Convert AVI to MP4?

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Massive Size Reduction

AVI files are huge. MP4 uses modern compression for 50-80% smaller files.

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Quality Preserved

Advanced encoding keeps your video looking great despite the smaller file size.

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Play Anywhere

AVI doesn't work on phones. MP4 plays on every device and platform.

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Fast Processing

Server-side conversion handles even large AVI files quickly.

MODERNIZE YOUR VIDEO LIBRARY

Digitizing Old Recordings

Camcorder footage, screen captures from the 2000s, and DVD rips are often stuck in AVI format. Convert them to MP4 and they become quickly playable on any modern device. After conversion, compress the output to save storage space.

Security Camera Footage

Many CCTV and security systems still export AVI. Convert to MP4 so footage can be shared via email, WhatsApp, or cloud storage without compatibility issues. Use our video converter if you need other output formats.

Sharing on Social Media

No social platform accepts AVI uploads. Convert to MP4 first, then add AI subtitles for better engagement on Instagram, TikTok, and YouTube. Our compressor ensures your file meets platform size limits.

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AVI to MP4 — FAQ

AVI uses minimal compression. Converting to MP4 with H.264/H.265 dramatically reduces size while maintaining quality.

The quality loss is negligible. Modern MP4 encoding preserves visual quality at a fraction of the file size.

Yes, we support common AVI codecs including DivX, Xvid, and uncompressed AVI.

The limit depends on your plan: 500 MB without an account, more with a free account, up to 5 GB on Pro.

The time depends on the file size, duration, source codec, and chosen format.

Currently one file at a time. Each conversion takes just seconds.

Yes, we support common AVI codecs including DivX, Xvid, MJPEG, and uncompressed AVI. The output is always a universally compatible H.264 MP4 file.

Typically 50-80% smaller than the original AVI, depending on the source codec. Uncompressed AVI files see the biggest reductions. For even more savings, run the output through our video compressor.

Yes, the audio track is re-encoded to AAC format for maximum compatibility. If you only need the audio, try our video converter or extract it separately.

What Creators Say

Convert your AVI to MP4 now

Smaller files, better compatibility. Free.

Say Goodbye to AVI

AVI had its time, but MP4 is the standard now. Klipa's free AVI to MP4 converter modernizes your video files with smaller sizes, better quality, and universal compatibility — no software needed. Pair it with our compressor, AI subtitles, and format converter for a complete video toolkit.