Change Video Speed
Make a video faster or slower — from 0.25× slow motion to 4× fast, or an 8× / 16× timelapse — with a live preview and natural-sounding audio. Free, no watermark, nothing uploaded.
Free · No sign-upHow to use Change Video Speed
- 1. Drop a video (MP4, MOV or WebM). It opens in the preview player.
- 2. Pick a speed — 0.25× to 4×, a timelapse (8× or 16×), or type any value from 0.1× to 16×. Press play to preview it at that speed.
- 3. Keep Keep the original voice pitch ticked for natural-sounding audio, or tick Remove audio. Optionally choose a smaller output size.
- 4. Click Export MP4, watch the progress and Download the result. You can cancel at any time.
Frequently asked questions
Is it free, and is my video uploaded?
It is free with no sign-up and no watermark, and your video never leaves your device. The export is done by ffmpeg compiled to WebAssembly, which downloads once (about 32 MB) and is then cached by your browser.
How long will the new video be?
The length is divided by the speed: a 60-second video becomes 30 seconds at 2×, 2 minutes at 0.5× and 7.5 seconds as an 8× timelapse. The exact new length is shown under the speed controls before you export.
Does the voice sound like a chipmunk?
Not by default. With Keep the original voice pitch ticked, the audio tempo is changed without changing its pitch. Untick it if you want the classic chipmunk (fast) or deep slow-motion (slow) sound.
What does timelapse do?
The 8× and 16× timelapse presets keep every 8th or 16th frame and play them at the original frame rate, which is how a timelapse is made. Audio is removed by default because it is rarely useful at that speed, but you can untick Remove audio to keep it.
Is slow motion smooth?
Slow motion repeats frames to keep the original frame rate, so 0.5× looks like the original filmed at half speed. It does not invent new in-between frames, so very slow speeds on normal 30 fps footage can look choppy. Footage filmed at 60 fps or more slows down best.
What format and quality do I get?
An MP4 with H.264 video (quality level CRF 23) and AAC audio at 128 kbps that plays everywhere. The frame rate stays the same as the original, and you can keep the original size or scale down to 1080p, 720p or 480p for a faster, smaller export.