Drop a .webm screen recording and it is re-encoded to a play-everywhere MP4 on your device — nothing uploaded.
Drop a .webm screen recording and it is re-encoded to a play-everywhere MP4 on your device — nothing uploaded.
Convert WebM to MP4 in your browser. WebM is what screen recorders, browser-based capture tools, and downloaded web videos produce — great for the web, unsupported almost everywhere else: iPhones won't play it, most editors won't import it, many platforms won't accept it. GhostVideo re-encodes it to a universal MP4 (H.264 + AAC) on your device. No upload, no watermark, no signup — screen recordings of your work stay on your device.
Drop your WebM
Drag in the .webm — a screen recording, a browser capture, a downloaded clip. Convert to MP4 is pre-selected.
It re-encodes locally
ffmpeg converts the VP8/VP9 video and Opus/Vorbis audio to H.264 + AAC in your browser — nothing is sent anywhere.
Download the MP4
Save it — ready for iPhones, editors, email, and every upload form that rejected the WebM.
Is my recording uploaded?
No — the conversion runs entirely in your browser. Screen recordings often show your inbox, code, or dashboards; here they never leave your device.
Why won't my WebM play on an iPhone?
Apple doesn't ship WebM/VP9 support in most contexts. MP4 with H.264 plays natively on every Apple device — that's the point of converting.
Will the quality change?
The re-encode targets near-source quality; for screen recordings the result is effectively identical. Chain Compress afterwards if you also need it smaller.
My editor rejected the WebM — will the MP4 import?
Yes — H.264 MP4 is the most universally supported format in editing software, including the ones that refuse WebM.
Does the audio convert too?
Yes — Opus or Vorbis audio is re-encoded to AAC, the MP4-native codec, so sound works everywhere the video does.
Every GhostVideo tool runs entirely in your browser. Your file is never uploaded — there's no upload endpoint to send it to.