AVI Converter: Fast, Lossless & Secure

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High-Speed AVI to MP4 Converter: Lossless Quality and Level-3 GPU Acceleration

Effortlessly convert AVI, WMV, MKV and 500+ legacy formats in seconds
Modernize AVI files for Apple TV, iPhone, and pro-grade Home Theater systems
Fix 'Unsupported' AVI errors—Convert to universal, pixel-perfect MP4 or ProRes
Zero Quality Loss — Preserve every audio track and hard-coded subtitle perfectly
The Pro-Grade Solution for Media Collectors, Plex Power Users, and Content Creators

Convert AVI

Zero-Lag AVI Workflow — Instant Conversion to Edit-Ready ProRes for Premiere and DaVinci

Convert AVI and 4K videos to MP4 or HEVC for smaller files and full quality—an ideal space-saving tool for movie collectors

400+ Audio Files

Supports 400+ Audio Formats

AAC Converter AC3 Converter AIFC Converter AIFF Converter ALAC Converter AMR Converter APE Converter AU Converter CAF Converter DSD Converter DSS Converter FLAC Converter

M4A Converter

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OGA Converter OGG Converter

Opus Converter

PCM Converter RA / RAM VOC Converter WAV Converter

WEBA Converter

WMA Converter

500+ Video Files

Supports 500+ Video Formats

3G2 Converter 3GP Converter 3GPP Converter AVI Converter

DV Converter DVR Converter FLV Converter GIF Converter

M2TS Converter M4V Converter MKV Converter

MOD Converter MOV Converter

MP4 Converter

MPEG Converter MPG Converter MTS Converter MXF Converter RM Converter RMVB Converter SWF Converter TS Converter VOB Converter WEBM Converter

WMV Converter WTV Converter

Convert AVI to MP4 in 3 Fast Steps

1. Upload Your AVI File

Drag and drop your AVI video or select it from your device. Large files are supported with stable, secure uploads.
2. Pick Format

Select MP4 (H.264/HEVC) or MOV from our list of 500+ optimized presets. You can preserve 1:1 original quality or compress files to save up to 50% of your disk space for Plex and NAS
3. Convert & Go

Hit 'Convert' and let our Level-3 Hardware Acceleration do the heavy lifting. Get high-quality, play-ready files in seconds—perfectly synced for your iPhone, Apple TV, or Smart TV

Lightning-Fast AVI to H.265 Transcoding

Don't let your PC crawl. Our Level-3 Hardware Acceleration utilizes your NVIDIA/AMD GPU to convert massive AVI libraries up to 47x faster than standard tools

Convert AVI
Shrink Your Files, Not Your Quality

Reclaim up to 70% of your hard drive space. By converting outdated AVI files to High-Efficiency Video Coding (HEVC), you can store twice the movies on your Plex or NAS

Optimize My Storage
Visual Excellence with Zero Quality Loss

Our Pro-Grade engine ensures 1:1 pixel preservation. Experience crystal-clear 4K and HD playback that stays true to the original source while moving to a modern container

Convert with Zero Loss
Play Legacy AVI on Any Modern Device

End the "Format Not Supported" nightmare. Seamlessly convert unsupported AVI clips into H.265 files ready for Apple TV 4K, iPhone, iPad, and Smart TVs

Make AVI Playable
Batch Convert Entire Folders in One Click

Stop converting files one by one. Drag and drop your entire archive and let our stable, crash-free engine handle the workload while you focus on what matters

Batch Conversion

Convert Any AVI, No Exceptions

From Legacy Dashcam Clips to Corrupted Archives, Multi-Downloader Handles Every AVI with Ease

Convert from AVI

Convert to AVI

Pixel-Perfect AVI to Apple Transcoding — Native Compatibility Guaranteed

The Ultimate Tool for Movie Collectors, Media Archivists, Plex Power Users & Apple Fans

Plex & NAS Power Users

Stop Plex transcoding lag. Convert bulky AVI libraries into space-saving, direct-play HEVC for your home server

Legacy Media Collectors

Modernize your old AVI archives. Batch convert 90s/00s movie collections for seamless playback on 4K Smart TVs

Family Memory Archivists

Rescue old DV & camcorder AVI files. Safely convert precious family memories for easy sharing on iPhone & iCloud

ProVideo Editors

Bridge the gap. Transcode legacy AVI rushes into edit-ready ProRes for Adobe Premiere or DaVinci Resolve

Dashcam & Security Users

Fix unsupported AVI footage. Quickly convert dashcam or CCTV clips into playable MP4 for legal or insurance use

Instant AVI to ProRes Conversion — Accelerate Your Edit Without the Lag

Join 500,000+ editors using our pro-speed transcoder. Turn 'unplayable' AVI footage into edit-ready ProRes or MP4 files

Sarah Jenkins Freelance Genealogist

I had over 200 legacy AVI files from an old Sony camcorder that wouldn't open on my new Mac. Multi-Downloader was a lifesaver. It batch-converted everything to MP4 in minutes without losing that nostalgic quality. Now my family can watch our 90s memories on the Apple TV!

David Miller IT Systems Administrator

My Plex server was constantly transcoding old AVI movie rips, causing massive CPU lag. I used this tool to optimize my entire library to HEVC. The GPU acceleration is real—it’s significantly faster than any open-source tool I’ve tried. No more buffering!

Michael Ross Documentary Filmmaker

I was handed a drive of legacy AVI rushes for a project, and Premiere Pro was choking on them. Multi-Downloader converted them to ProRes 422 with perfect timecode preservation. It’s now a permanent part of my DIT toolkit for handling 'stubborn' media.

Amanda Thompson Private Investigator

Dashcam and CCTV footage in AVI format can be notoriously difficult to play or share for legal evidence. This software is the most reliable way I’ve found to get playable, high-quality MP4s instantly. It's clean, professional, and most importantly, it works every time.

Robert Chen Software Engineer

I refuse to use online converters because I don't want my personal videos uploaded to a random cloud server. Multi-Downloader does everything locally on my desktop. It’s fast, secure, and I don't have to worry about my data being compromised. Highly recommended for the security-minded.

Linda Garcia Teacher

I’m not a computer expert, so I needed something simple. I literally just dragged my old files into the window and clicked 'Convert for iPhone.' It worked perfectly on the first try. No 'format not supported' errors anymore. Worth every penny!

Emily Carter Content Creator

Converting AVI to MP4 used to be a headache. This tool makes it effortless and works perfectly for YouTube and social media uploads.

Frequently Asked Questions

Will I lose video quality when converting AVI to MP4?

With Multi-Downloader’s High-Fidelity Engine, quality loss is virtually zero. By using advanced codecs like H.264 or HEVC (H.265) and choosing the 'Auto-Copy' mode, you can change the container from AVI to MP4 while keeping every original pixel and audio detail intact.

How long does it take to convert a large AVI file?

We utilize Level-3 GPU Hardware Acceleration (NVIDIA, AMD, and Intel). This allows our software to convert AVI files up to 180X faster than standard online converters. A 2GB movie file that takes 20 minutes elsewhere can be finished in under 60 seconds here.

Can I convert multiple AVI files at once?

Absolutely. Our Batch Processing feature allows you to drag and drop entire folders of AVI files into the queue. You can apply the same settings to all files or customize each one individually before hitting the 'Convert' button.

Why can’t I play my AVI files on my Mac or iPhone?

AVI is a legacy format created by Microsoft in the 90s, and Apple’s native players (like QuickTime and TV app) no longer support many of its older codecs. Multi-Downloader solves this by transcoding those files into Apple-native formats (MOV/MP4) instantly.

Can I convert AVI files to edit in Premiere Pro or DaVinci Resolve?

Yes. For professional editors, we recommend converting legacy AVI rushes into Apple ProRes 422. This ensures perfect frame accuracy, preserves metadata, and eliminates the 'laggy timeline' issues common with old AVI files.

Does Multi-Downloader support 4K and Ultra HD AVI files?

Yes. Multi-Downloader fully supports 4K UHD resolution. Whether your source is an old 480p camcorder recording or a massive 4K capture, it scales and encodes with professional-grade precision.

Can I compress my AVI files to save disk space?

Yes. AVI files are notoriously bulky. By converting them to HEVC (H.265) via Multi-Downloader, you can reduce the file size by up to 80% without a noticeable drop in visual quality—perfect for clearing up space on your NAS or hard drive.

What if my AVI file has audio sync issues?

Legacy AVI files often suffer from 'audio-video drift.' Multi-Downloader’s Sync-Correction technology automatically realigns the audio and video streams during the conversion process, ensuring a perfectly timed playback every time.