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 regola la velocità di riproduzione dei video da 0,25x (rallentatore) a 4x (timelapse) direttamente nel tuo browser. La velocità dell'audio viene regolata con conservazione del tono utilizzando il filtro atempo. Opzione per disattivare l'audio per modifiche silenziose della velocità. Utilizza i filtri setpts e atempo di FFmpeg.wasm.
How It Works
Video: setpts={1/speed}*PTS. Audio: filtro atempo (concatenato per velocità al di fuori dell'intervallo 0,5-2,0) per conservare il tono.
Use Cases
- •Creare effetti slow motion
- •Accelerare tutorial
- •Creare timelapse da video
- •Accelerare filmati di sorveglianza
- •Rallentare replay sportivi
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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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