Instantly speed up or slow down any MP4, WebM or MOV in your browser. No uploads, no quality loss.
Drag and drop your video file here
or click to browse (max 500MB)
This tool works entirely in your browser. Your videos are never uploaded to any server.
Powered by modern browser APIs like MediaRecorder and Canvas for efficient video processing.
Powered by WebCodecs + Remotion, Cap processes every frame locally for near-instant results—while keeping your files 100% private.
Modern browser APIs crunch frames directly on your GPU/CPU, so even large clips render in seconds.
Nothing ever touches a server. All encoding and decoding stays on-device.
Dial in super-slow 0.25× for tutorials or crank up to 3× for snappy demos—audio pitch is auto-corrected.
Grab Cap — the open-source screen recorder & editor that lives on your machine.