The video is played at the selected speed and re-encoded in real-time using the Canvas and MediaRecorder APIs. Audio pitch changes naturally with speed.
No. All processing happens locally in your browser.
The video is played back at the chosen speed during recording. A 60-second video at 2x speed takes about 30 seconds to process.
WebM in Chrome, Edge, and Firefox; MP4 in Safari. Both play in all modern browsers and can be converted with the Video Compressor tool.