Video Tools
Video Speed Changer
Speed up or slow down videos from 0.25x to 4x with audio pitch preservation.
Your files stay on your device - processed locally via WebAssembly, never uploaded
Drop a video file or click to upload
MP4, WebM, MOV
Your videos are processed locally. Nothing is uploaded.
Embed this tool on your website
Copy this code to add the Video Speed Changer to your site for free. It runs entirely in your visitors' browsers - no API key, no usage limits.
<iframe src="https://optipix.art/embed/video-speed" width="100%" height="600" style="border:1px solid #e4e4e7;border-radius:8px;" title="Video Speed Changer by OptiPix" loading="lazy"></iframe> <p style="font-size:12px">Free tool by <a href="https://optipix.art/video-speed">OptiPix Video Speed Changer</a></p>
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About Video Speed Changer
Last updated: May 2026
OptiPix 비디오 속도 변경기는 브라우저에서 직접 비디오 재생 속도를 0.25배속(슬로우 모션)에서 4배속(타임랩스)까지 조절합니다. 오디오 속도는 atempo 필터를 사용하여 음정 보존과 함께 조절됩니다. 오디오를 음소거하여 무음 속도 변경을 선택할 수 있습니다. FFmpeg.wasm의 setpts 및 atempo 필터를 사용합니다.
How It Works
비디오: setpts={1/speed}*PTS. 오디오: atempo 필터 (0.5-2.0 범위 밖의 속도에 대해 체인 연결)를 사용하여 음정을 보존합니다.
Use Cases
- •슬로우 모션 효과 만들기
- •튜토리얼 속도 높이기
- •비디오로 타임랩스 만들기
- •감시 영상 속도 높이기
- •스포츠 리플레이 속도 늦추기
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If you find Video Speed Changer useful, check out these related tools: Video Trimmer, Audio Speed Changer, and Reverse Video. All tools run entirely in your browser with no uploads or signups required.
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