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 视频变速器可直接在您的浏览器中将视频播放速度从 0.25 倍（慢动作）调整到 4 倍（延时摄影）。音频速度通过使用 atempo 滤镜进行音高保留进行调整。可以选择静音音频以进行静音变速。使用 FFmpeg.wasm 的 setpts 和 atempo 滤镜。
How It Works
视频：setpts={1/speed}*PTS。音频：atempo 滤镜（在 0.5-2.0 倍范围外链式使用）以保留音高。
Use Cases
- •创建慢动作效果
- •加速教程
- •从视频创建延时摄影
- •加速监控录像
- •放慢体育比赛重播
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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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