Change the playback speed of a video — a simple 2× fast-forward, a dramatic slow-mo, or a full speed ramp that flows between speeds. Drag the curve to set how fast each part plays; audio follows the curve in the preview with selectable pitch handling. Everything runs locally in your browser using WebCodecs — your file is never uploaded to a server, so it stays private and conversion starts instantly. Need more than one operation? Use the "Continue this clip in" links in the workspace — your edits carry over to crop, trim, resize and compress without re-uploading the file.
How to change video speed
- Drop a video onto the box above, or paste a video URL.
- Drag the speed curve: in Speed view drag a segment up or down to change its rate; in Frame view drag points to map output time to source time.
- Double-click a point to smooth it into a ramp; drag the green handles to shape the acceleration.
- Click Create MP4 to download the retimed video.
Frequently asked questions
- Can I speed up one part and slow down another?
- Yes — double-click the curve to add points and give every section its own speed. Smoothed points create gradual speed ramps instead of hard jumps.
- What happens to the audio?
- In the preview, audio follows the speed curve. "Preserve pitch" time-stretches so voices keep their pitch; "Varispeed" resamples like tape, so pitch rises with speed.
- Is my video uploaded?
- No. Everything runs locally in your browser using WebCodecs — your file is never uploaded to a server, so it stays private and conversion starts instantly.