Video To MP4How to Convert WEBM to MP4 on iPhone
WEBM is the web's favorite video format — and one of the few things an iPhone genuinely can't play. If you've saved a clip from a website and hit a black screen, this is the fix.
The quick answer
Open the WEBM file in Video To MP4 via the Files app, convert to MP4, and the clip plays like any normal video — savable to Photos, shareable to any chat.
Step-by-step: WEBM → MP4
- Locate the WEBM in your Files app (saved web videos usually land in Downloads).
- Open Video To MP4 → Convert and select it.
- Choose MP4, keep the original resolution for no quality change.
- Convert. WEBM clips are usually short, so this takes seconds — done privately on your device.
Why iPhones refuse WEBM: WEBM is Google's open format, built for Chrome and the web. Apple backs its own formats and has never added full WEBM support to iOS — so the file sits there unplayable until it's converted.
GIFs, stickers and reaction clips
A lot of WEBMs are short looping clips. If your end goal is a reaction GIF rather than a video, convert once to MP4 and then use the video-to-GIF tool — two taps from unplayable web clip to shareable GIF.
The rest of the stubborn-format family
Same flow, same fix for MKV, AVI, WMV and FLV files. One app covers every "this won't play" moment.
Do it in seconds with Video To MP4
Convert, compress, trim, extract audio and make GIFs — 100% on-device, free to start.
Download Free on the App Store