Change Video Speed

Speed up or slow down a video, 0.25× to 4× — in your browser.

Select a video file

Speed up or slow down a video — 0.25× to 4×. Runs in your browser.

点击选择，或将文件拖到此处

如何 Change Video Speed

1
Add your video
Drop in the clip you want faster or slower.
2
Set the speed
Drag the slider from 0.25× to 4×. Tick mute if the pitch shift bothers you.
3
Apply and download
Click Change speed; the video is re-recorded at the new rate.

Does the audio pitch change?+

Yes — this changes speed by playing faster or slower, so the pitch shifts with it. Tick 'mute' to drop the audio instead.

Is my video uploaded?+

No. It's re-recorded from a canvas in your browser.

How fast/slow can it go?+

0.25× (quarter speed) to 4× (four times). The processing time scales with the output length.

What format do I get?+

MP4 or WebM depending on your browser.

你们会把我的文件上传到服务器吗？+

不会——这里的每个工具都完全在你的设备上处理文件，不会向服务器上传任何内容。唯一的例外是 AI 工具，它们会把提取的文本（而非文件本身）发送给 Claude 来完成工作。

有文件大小限制吗？+

我们没有人为设置限制，但由于处理过程在你的浏览器中进行，非常大的文件（超过 500MB 或 1000 页）会受到你设备内存的限制，而非我们的限制。