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 Video Speed Changer justerer videoafspilningshastigheden fra 0,25x (slow motion) til 4x (timelapse) direkte i din browser. Lyden justeres med bevarelse af tonehøjde ved hjælp af atempo-filteret. Mulighed for at slå lyden fra for lydløse hastighedsændringer. Bruger FFmpeg.wasm setpts og atempo-filtre.
How It Works
Video: setpts={1/speed}*PTS. Lyd: atempo-filter (kædet for hastigheder uden for 0,5-2,0-området) for at bevare tonehøjden.
Use Cases
- •Opret slow motion-effekter
- •Fremskynd tutorials
- •Opret timelapse fra video
- •Fremskynd overvågningsoptagelser
- •Sænk hastigheden på sportsgenafspilninger
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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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