WEBM (WebM Video) and MOV (QuickTime Movie) are built for different jobs. WEBM is typically used for web video, screen recordings, while MOV is best for iphone recordings, final cut editing. Converting lets you open, share or upload your files wherever MOV is expected.
How to use the WEBM to MOV converter
- Add your WEBM filesClick “Choose Files” or drag and drop them into the box. You can add many files at once — or paste a file with Ctrl+V.
- Choose MOV and adjust settingsMOV is selected automatically. Optionally open Settings to change resolution, quality or frame rate.
- Convert and downloadPress “Convert”. Your MOV files appear instantly — download them one by one or all together as a ZIP.
WEBM vs MOV
WEBM WebM Video
WebM is an open, royalty-free format designed for the web. Browsers and screen recorders often produce it, but iPhones, QuickTime and many video editors handle it poorly.
- Compression
- Lossy (VP8/VP9/AV1)
- Features
- Video + Opus/Vorbis audio
- Origin
- 2010, Google
- Best for
- Web video, screen recordings
MOV QuickTime Movie
MOV is Apple’s QuickTime container and the format iPhones record in. It offers excellent quality but files are often large and may not play on Windows PCs, Android phones or some websites.
- Compression
- Lossy (H.264/HEVC/ProRes)
- Features
- Multiple tracks
- Origin
- 1991, Apple
- Best for
- iPhone recordings, Final Cut editing
Why use ConvertMathly?
Files are processed on your device and never uploaded. Close the tab and they are gone.
No account, no daily cap, no queue and no watermark — convert as much as you want.
The same engine used by professional video tools, running in your browser via WebAssembly.
Windows, Mac, Linux, Chromebook, iPhone and Android — any modern browser, nothing to install.
Frequently asked questions
How do I convert WEBM to MOV?
Add your WEBM files above, make sure MOV is selected and press Convert. The MOV files are ready to download a few seconds later — no installation or account required.
Why does the first conversion take a little longer?
The video engine (FFmpeg compiled to WebAssembly, about 30 MB) is downloaded once and then cached by your browser. After that, conversions start immediately — even offline.
Is there a file size limit?
There is no artificial limit. Because the conversion runs in your browser, the practical limit is your device memory — files up to around 1–2 GB work on most computers. Long videos take longer on phones.
Are my WEBM files uploaded to a server?
No. ConvertMathly converts files entirely inside your web browser using JavaScript and WebAssembly. Your files never leave your computer or phone, which makes it safe for private photos and documents.
Can I convert multiple WEBM files at once?
Yes — add as many files as you like. They are converted one after another and you can download everything in a single ZIP.