Adding a background to a screen recording
This tool does two things now: it can record your screen, and it re-renders any video with a background, padding, rounded corners, and a shadow — the same styling the screenshot tool applies to a still image, applied frame by frame instead. If you already have a clip from somewhere else — OBS, the Windows Game Bar, a phone recording — dropping it in still works exactly as before.
Recording a screen
Click "Record screen" and the browser asks which screen, window, or tab to share — that prompt comes from the browser itself, not from this site, and there's no way around it. Once you pick one, a red dot and a running clock show the recording is live. Check "Microphone too" first if you want your voice on the track along with whatever the screen produces. Click "Stop recording" — or just end the sharing from the browser's own toolbar — and the clip lands straight in the dress-up area below, ready to add a background to.
Nothing leaves your computer
Recording, playback, and rendering all happen inside the browser. The screen is captured, redrawn with the background applied on every frame, and the result comes back as a new file — start to finish, on this machine, without any of it going to a server.
Three things worth knowing before you use it
Baking takes as long as the clip runs. This isn't converting a file all at once — it's actually playing the video and capturing it frame by frame as it plays. A one-minute clip takes about a minute.
Sometimes you get mp4, sometimes webm. Which format comes out is decided by the browser, not by this tool. Chrome or Edge on Windows can produce mp4 in some cases; where that's not supported, it falls back to webm instead. Either way, the video itself looks the same.
Desktop Chrome or Edge only. Browsers that don't support this kind of recording and frame-by-frame rendering can't open this tool at all.
Keep the clip short and trim it first
A demo video only gets watched all the way through if it's short, and since baking time scales with the clip's length here, trimming the dead air off the front and back in an editor first is worth doing before it comes anywhere near this tool. Baking a tight 30-second clip beats baking five minutes and hoping people stick around.