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: June 2026
OptiPix Video Speed Changer adjusts video playback speed from 0.25x (slow motion) to 4x (timelapse) directly in your browser. Audio speed is adjusted with pitch preservation using the atempo filter. Option to mute audio for silent speed changes. Uses FFmpeg.wasm setpts and atempo filters.
How It Works
Video: setpts={1/speed}*PTS. Audio: atempo filter (chained for speeds outside 0.5-2.0 range) to preserve pitch.
Use Cases
- •Create slow motion effects
- •Speed up tutorials
- •Create timelapse from video
- •Speed up surveillance footage
- •Slow down sports replays
You Might Also Like
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.
Explore more: Browse all tools · Step-by-step guides · Tips & tutorials · Compare tools
Frequently Asked Questions
Speed range?
Audio pitch?
Quality?
Uploaded?
Slow motion?
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