How to Convert Video Formats (MOV, MP4, WEBM) — Free
An iPhone .mov clip that won't upload where you need it, an MP4 you want as WEBM for a smaller web-friendly file — here's how to convert between video formats in your browser, no software to install.
Steps
- Upload your video at Stelluna's Video Format Converter — MP4, MOV, WEBM, MKV, or AVI, up to 300MB.
- Pick the format you want — MP4, MOV, or WEBM.
- Click Convert. Your video is converted right there in your browser using your device's own hardware video encoder.
- Download the converted file.
Ready to try it? Free, no sign-up, your video never leaves your device.
Open Video Format ConverterWhich format should I actually use?
| Format | Best for |
|---|---|
| MP4 | Maximum compatibility — every device, app, and platform accepts it |
| MOV | Apple's native format — best when staying inside the Apple ecosystem (Final Cut, iMovie) |
| WEBM | Smaller file size, built for web use — ideal for embedding on a website |
Most "why won't this video upload" problems on non-Apple platforms come down to MOV — converting to MP4 almost always fixes it.
FAQ
How do I convert MOV to MP4?
Upload the MOV file at Stelluna's Video Format Converter, choose MP4 as the target format, and click Convert.
Is it free?
Yes — no account, no watermark, no limit on how many videos you convert.
Does my video get uploaded anywhere?
No. The conversion happens entirely in your browser, using your device's own video encoder — your video never leaves your device.
How long does it take?
Depends on the video's length and resolution — most short clips convert in a few seconds to a minute, right in the browser tab.
Is there a file size limit?
Yes, up to 300MB, to keep the conversion running smoothly in your browser.