Convert QuickTime to AVI Free Online
Convert QuickTime (.mov) videos to AVI format for free in your browser. Local FFmpeg.wasm transcoding with no upload. Your files stay on your device.
A QuickTime video is usually a `.mov` file. It may open perfectly on your Mac, then fail in a Windows tool that only accepts AVI or expects older media containers.
That mismatch is the real reason to convert. You are not making the file more modern, you are creating a practical AVI copy for a specific app, machine, or handoff.
Do not rename `clip.mov` to `clip.avi`. A new extension changes the filename, not the container, video stream, audio stream, or playback compatibility.
This is a transcode, not a loss-free remux. GrepCut reads the QuickTime MOV, decodes the media, and writes a new AVI file.
The output uses H.264 video. If your QuickTime source has audio, GrepCut writes MP3 audio because it is a practical fit for older AVI workflows.
Because FFmpeg.wasm runs in your browser, conversion speed depends on your device. Short clips are the best fit for the web converter, while long HD or 4K videos may be faster with native FFmpeg on your computer.
Use GrepCut when your QuickTime file is private and you do not want to upload it to a cloud converter. The work happens locally in your browser.
Use the native FFmpeg command shown on the converter page when your clip is very long, high resolution, or too heavy for browser memory.
If you need a format for phones, browsers, TVs, or social uploads, [QuickTime to MP4](/converters/quicktime-to-mp4) is usually the better path. If the target system says AVI, this converter gives you that AVI copy without sending the video away.
Can you convert QuickTime to AVI without uploading?
Yes. GrepCut uses FFmpeg.wasm in your browser, so your QuickTime .mov file is processed on your device. You do not need an account, an upload, or a server conversion queue.
Is QuickTime the same as MOV?
For everyday video files, QuickTime usually means a `.mov` file. This converter is built for QuickTime MOV input and creates an AVI output file.
Will your QuickTime video lose quality when converted to AVI?
Yes, you should expect a transcoded copy rather than a loss-free remux. The goal is compatibility with AVI-focused software, not a perfect archival replacement.
Why does the AVI output use H.264 video and MP3 audio?
Those settings match the GrepCut QuickTime to AVI pipeline. H.264 gives you a practical video stream, and MP3 audio is a safe choice for older AVI workflows when your source includes sound.
Why not just change .mov to .avi?
Changing the extension only changes the name. If your app rejects the QuickTime container or codec, renaming will not fix it. You need a real conversion that writes a new AVI file.
Why is browser QuickTime to AVI conversion slower than a desktop app?
FFmpeg.wasm runs through WebAssembly inside your browser. That keeps your file local, but it also means the browser and your device do the encoding work. Native FFmpeg is usually better for very large files.
Should you convert QuickTime to AVI or QuickTime to MP4?
Choose AVI when your target is an older Windows tool, legacy playback setup, or AVI-only workflow. Choose MP4 when you want a modern file for phones, browsers, TVs, or sharing.
Can you convert iPhone MOV videos to AVI?
Yes, when the video can be decoded by the browser and FFmpeg.wasm. Keep the iPhone MOV as your original, then use the AVI output only for the tool or device that needs it.