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Video Speed Changer
Adjust video playback speed to create fast-forward or slow-motion effects with synchronized audio speed adjustment.
What this tool does
Video Speed Changer helps you adjust video playback speed to create fast-forward or slow-motion effects with synchronized audio speed adjustment.
What you get
Video Speed Changer produces a direct output in this page and keeps all processing on your device, with nothing uploaded to our servers.
Files are processed locally in your browser using WebAssembly. This input is required.
Saved FFmpeg presets (stored locally)
0.5 = half speed, 1.0 = normal, 2.0 = double speed
Report a bug
If this tool misbehaves, share a quick summary so we can investigate. We include the tool URL automatically—no need to copy and paste.