Video Speed Changer
Speed up tutorials, slow down sports replays, or hit a tight runtime by re-timing any video from 0.25× to 4×. Keep the audio in its original pitch, or allow it to shift for a deliberate chipmunk / slow-mo effect — FFmpeg runs locally in your browser.
How to use this tool
- 01
Upload your video
Any format FFmpeg supports — it stays in your browser.
- 02
Set the speed
0.5 for half speed, 2.0 for double speed, anywhere from 0.25× to 4×.
- 03
Choose pitch handling
Preserve pitch for speech and music; shift for chipmunk / slow-mo special effects.
- 04
Render and download
Output duration = original duration ÷ speed; the new length is shown before you render.
Why this matters
Most editors expose 0.5× and 2× as buttons and make anything in between a timeline-nudging chore, and quick online converters either skip audio handling entirely or chipmunk every voice. Re-timing should be one number plus a single decision about what happens to the audio.
This does exactly that, locally: a precise multiplier, an explicit pitch-preserve vs pitch-shift choice, and the resulting duration shown before you commit. To re-time only part of a clip, trim the section first with the Video Trimmer and then change its speed here.
Related tools
Change audio speed from 0.25× to 4× in your browser, with pitch preserved for natural speech or shifted for effects. No upload, no signup, free.
Trim any video to a precise start and end in your browser — lossless stream-copy by default, optional re-encode for frame-accurate cuts. No upload.
Reverse any video — and optionally its audio — entirely in your browser with FFmpeg.wasm. Short clips work best. No upload, no signup, free.
FAQ
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