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무료 Video Speed Changer
Speed up or slow down a video from 0.25× to 4×, with pitch-corrected audio. Great for slow-motion and timelapse. Runs entirely in your browser.
파일 크기 제한 없음파일이 비공개로 유지됨로그인 불필요영원히 무료
파일을 여기에 끌어다 놓거나 클릭하여 찾기
MP4, WebM, MOV, AVI, Video 파일 크기 제한 없음
파일이 기기를 떠나지 않습니다. 모든 처리는 브라우저에서 로컬로 이루어집니다.
Speed up or slow down a video (0.25×–4×), with pitch-corrected audio. Runs entirely in your browser.
Optimize for your platform
사용 방법
Speeding up or slowing down a video means re-timing both the picture and the sound. This does it with FFmpeg in your browser, keeping the audio pitch natural.
- 1FFmpeg.wasm loads onceThe WebAssembly build of FFmpeg (~30 MB) downloads on first use and is cached afterwards.
- 2You pick a speedFrom 0.25× (slow motion) to 4× (fast forward / timelapse feel). Your file stays in the browser.
- 3Video and audio are re-timedThe video uses setpts to change frame timing; audio uses chained atempo filters that stretch time without altering pitch, so voices stay natural.
- 4You download the resultThe re-timed MP4 is offered for download and previewed in-page.
No upload, no watermark — re-time personal clips, lectures, or tutorials entirely on your device.
왜 저희 도구인가요?
✓Completely free — no hidden costs, ever
✓No account, email, or login required
✓Files stay on your device — processing happens in your browser
✓Works on any device — phone, tablet, desktop
✓No watermarks on any output
✓Browser memory limits may apply for very large files
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