Video Speed Changer
Speed up or slow down any video (0.5×–2×) with pitch-corrected audio — no upload, no watermark.
Processed on your device — nothing is uploaded
About the Video Speed Changer
Create slow motion for sports analysis and tutorials, or fast-forward footage into tidy timelapses. ToolNest adjusts the video timing and re-times the audio with pitch correction, so voices and music stay natural instead of turning into a chipmunk chorus.
Everything is rendered locally in your browser with FFmpeg WebAssembly — no upload, no queue, no watermark, and no limit on how many clips you process.
How to use the Video Speed Changer
- 1Drop your video into the box.
- 2Pick a speed from 0.5× slow motion to 2× fast — and choose to keep or remove the audio.
- 3Press Change Speed and download your video.
Frequently asked questions
Will the audio pitch change?
No. The audio is re-timed with pitch correction, so speech and music sound natural at any speed.
What speeds are supported?
0.5×, 1.25×, 1.5× and 2× — the range that covers almost every practical use with clean results.
Is my video uploaded anywhere?
Never. Speed changes are computed entirely on your device.
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