MP4 to AVI
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MP4 to AVI wraps the video and audio streams already inside your MP4 file into an AVI container instead, without touching the actual compressed data. This is a remux, not a transcode: FFmpeg reads the H.264 (or occasionally H.265) video packets and AAC audio packets straight out of the MP4's structure and writes them into a new AVI header, so the conversion finishes in roughly the time it takes to copy the file rather than the time it would take to re-encode it.
The reason anyone still needs this in an MP4-dominated world comes down to specific software and hardware that simply predates modern container formats. AVI (Audio Video Interleave) is Microsoft's original video wrapper from the Video for Windows era of the early 1990s — decades before MP4 existed. It stuck around because a surprising amount of infrastructure was built on top of it and never modernized: older non-linear video editors, some digital signage and kiosk software, certain industrial and security camera management systems, and DVD-authoring tools that were coded against AVI as an assumed input format and have no MP4 import path at all.
Because MP4's typical H.264 video codec is one AVI's format can carry without complaint, this remux is usually trouble-free — unlike the reverse direction (MOV to AVI) where HEVC source video can create playback issues on very old AVI-only software. If your MP4 was originally encoded with H.264, which covers the vast majority of MP4 files in circulation, the resulting AVI should open cleanly in essentially anything built to read AVI at all. The one thing worth double-checking is audio: some genuinely old AVI decoders from the Windows XP/Vista era expect MP3 or PCM audio rather than AAC, so if you're targeting truly vintage software and the sound doesn't come through, that's usually the cause.
Everything happens locally via FFmpeg WebAssembly, so there's no upload step and no server-imposed size ceiling — useful if you're converting large archival footage or bulk video files for a legacy system migration.
FFmpeg parses the MP4 container's index to locate the compressed H.264 video and AAC audio packets, then writes a new AVI file header and streams those same packets into it using stream copy mode (-c copy). No frame is decoded or recompressed, so quality is identical to the source and the conversion completes in roughly the time needed to read and rewrite the file rather than the time a full re-encode would take.
Upload your MP4 file
Drop an .mp4 file onto the upload zone — footage from a camera, screen recording, or export from any editor works the same way.
Confirm the file details
Double-check the filename and size to make sure it's the correct video before converting.
Click Convert to AVI
FFmpeg copies the video and audio streams from the MP4 directly into a new AVI container without re-encoding.
Wait a few seconds
Because this is a stream copy rather than a transcode, even large files finish converting almost immediately.
Download the AVI file
Save the output — it keeps your original filename with a .avi extension.
Open it in your target software
Test playback in the legacy editor, kiosk system, or player you needed AVI for in the first place.
Convert additional files as needed
There's no limit on how many MP4 files you can remux to AVI in one session.
Legacy Non-Linear Editors
Import MP4 footage into older editing software from the 2000s that was built around AVI and has no reliable MP4 import path.
Older DVD Players & Set-Top Boxes
Some standalone DVD players and older set-top boxes read AVI from a USB drive but choke on modern MP4 files.
USB Playback on Legacy Devices
Digital photo frames, older media players, and some in-car USB systems support AVI file playback but not MP4.
Windows Kiosk & Signage Software
Certain kiosk and digital signage platforms deployed years ago were coded specifically against AVI as the expected video format.
Migrating Archival Footage
Convert MP4 footage to AVI when standardizing an archive around legacy cataloging or asset-management software built for that format.
Older Broadcast & Industrial Systems
Some broadcast automation and industrial video equipment predates MP4 support entirely and expects AVI or MPEG input.
True Lossless Remux
Video and audio are copied directly from the MP4 into the AVI container — no re-encoding, no quality change whatsoever.
Near-Instant Conversion
Because nothing is decoded or recompressed, even multi-gigabyte files convert in seconds rather than minutes.
Broad Legacy Compatibility
AVI remains one of the most universally recognized formats for older software, hardware, and archival systems.
Fully Local Processing
FFmpeg WebAssembly performs the remux inside your browser — your MP4 file is never uploaded to a server.
No Server-Side Size Cap
There's no artificial ceiling on file size beyond your account plan, since nothing is transmitted externally.
Free, No Watermark
Free with no account for files under 40 MB; sign up free for 80 MB or go Pro for 250 MB — output is never watermarked.
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