Convert MP4 to AVI online for free. Change video format for playback, editing, uploads, social sharing, or better compatibility across devices and platforms.
Converting MP4 to AVI re-encodes the video into the AVI container. Resolution and frame rate are preserved by default, and the audio track is copied without re-encoding when codec compatibility allows. File size depends on the chosen output codec.
Max file size 10MB. Sign up for more.
| File Name | Size | Convert To |
|---|
Checking files and selected output formats.
| File Name | File Size | Download |
|---|
AVI is Microsoft's legacy video container — largely superseded by MP4. Convert to AVI when you're archiving to older Windows-based systems, feeding into legacy editing software that doesn't accept MP4, or delivering to older projection / TV equipment that only handles AVI. For anything new, use MP4.
Same footage, different container. Get a file that plays where you need it to, with sensible defaults for codec, bitrate, and framerate.
Free-tier uploads are capped at 10 MB — fine for short clips and screen recordings, tight for anything long-form. Pro handles files up to 1 GB and batch jobs of up to 20 videos. Because video work is compute-heavy, sign-in is required on the free plan for anything past a minute of source video.
The defaults for AVI are set to the most-compatible codec for that container (H.264 for MP4, VP9 for WebM, and so on). If you want a smaller file at the same quality, pick a modern codec like H.265 — but check where the video's going first, because older devices can't play H.265.
Video conversion takes proportionally longer than audio or image work — roughly a few seconds per second of source video on a typical 1080p clip. The output downloads immediately once ready, and both the source and result are deleted from our servers within 30 minutes.
A file called MP4 tells you almost nothing about what's inside — the container is a box that could hold several different codecs. The codec is what actually determines quality, size, and compatibility. Converting MP4 to AVI usually means picking a new codec too; the defaults above are what most people expect to work everywhere.
Six scenarios where the format swap is the actual job — not incidental to something else.
Recent iPhones save videos as MOV wrapped around H.265, which older Windows machines and many web apps can't decode. Converting to a widely-supported AVI makes the clip playable everywhere.
HTML5 <video> reliably plays MP4 across every mainstream browser. Some formats (MOV, MKV, unusual containers) trigger downloads instead of playing inline. Converting to AVI first avoids the "why isn't this playing" support thread.
Final Cut loves MOV/ProRes. Premiere handles most things but chokes on variable-framerate phone MP4s. DaVinci Resolve wants specific codec support. Converting to what your editor actually understands prevents hours of debugging "why is playback laggy".
Email caps attachments at 25 MB. Slack's free plan tops out at 1 GB. Form portals often insist on under 100 MB. A modern codec-swap (H.264 → H.265) typically cuts size 40-60% at the same quality — usually enough to fit the limit without touching resolution.
Old AVI files, ancient FLV downloads, MPEG-2 rips from a decade ago — legacy formats work but eat disk space. Converting to a modern AVI halves storage without losing quality, and future-proofs the collection against the day players stop shipping with legacy decoders.
YouTube, Instagram, TikTok, and LinkedIn all publish their own "recommended encoding" specs. Converting to a spec-matching AVI before upload skips the platform's own re-encode and produces cleaner playback quality.
Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.
| Property | MP4 | AVI |
|---|---|---|
| Full name | MPEG-4 Part 14 | Audio Video Interleave |
| Year introduced | 2001 | 1992 |
| Developer / standard body | MPEG | Microsoft |
| MIME type | video/mp4 | video/x-msvideo |
| File extension | .mp4 / .m4v | .avi |
| Compression | H.264 or H.265 codec | Codec-dependent (DivX, XviD, MJPEG) |
| Color / data depth | 8/10-bit | Codec-dependent |
| Max dimensions / size | Codec-dependent (up to 8K) | Codec-dependent |
| Transparency | No | No |
| Animation | No | No |
| Standard / specification | ISO/IEC 14496-14 | Microsoft RIFF |
| Best for | Universal video compatibility — plays on every device | Legacy video files, archival |
MP4 (MPEG-4 Part 14) is an ISO standard multimedia container format based on Apple's QuickTime file structure. It is the most widely supported video format in the world — capable of playing on virtually every device, browser, and platform without additional software. MP4 files typically contain H.264 or H.265 video streams paired with AAC audio, though the container can hold a variety of codec combinations.
MP4 is the default choice for video distribution across the web, social media, streaming platforms, and mobile devices. Its combination of broad compatibility, efficient compression, and reasonable quality makes it suitable for everything from casual smartphone recordings to professional video delivery. The main limitations of MP4 are its relatively basic subtitle support compared to MKV, and the fact that some advanced codec configurations may not be universally playable on older devices.
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert MP4 files to AVI.
Read format, playback, upload, and editing guides related to MP4 to AVI Converter.
PowerPoint to PDF freezes your deck into read-only pages. Here's what actually survives (animations don't) and how to compensate.
That two-hour lecture recording as MP4 is unlistenable on the train. Convert it to MP3 to strip the video and keep just the audio you actually need.
iPhone videos in MOV won't play on Android or in WhatsApp status. Here's how to convert to MP4 — plus what to expect on file size and quality.
iPhone HEIC photos that Windows can't open — here's the fastest way to convert them to JPG without installing anything, plus the workarounds that actually work.
A complete guide to creating favicons for your website — covering ICO, PNG, and SVG formats, required sizes, HTML implementation, and free tools to generate favicons from any image.
FLV files won't play on modern devices. This guide shows you how to convert Flash Video to MP4 using free online and desktop tools — preserving quality and fixing compatibility issues.
