Video Speed Changer
Use Video Speed Changer, review the result, and keep the original until the output is checked.
How to use Video Speed Changer
- Select one video.
- Drag Adjust Speed, or press a Quick Speed Option from 0.25x to 2x.
- Open Advanced Settings to choose Output Format and Quality.
- Press Convert All; the result is named <name>_speed_<value>x with the extension you chose.
What Video Speed Changer actually does to your file
Both picture and sound are retimed together and the audio is stretched rather than pitched up, so voices keep their register at half speed. Changing speed forces a full re-encode of the video, which is slow in the browser and costs a generation of quality - do the trims first and the speed change once, rather than repeating it.
Video Speed Changer FAQ
What does Video Speed Changer do?
Easily change the speed of any video online with our free tool! Slow down or speed up MP4, AVI, 3GP, and more without losing quality. Quick, simple, and no watermarks. Perfect for editing videos to suit your needs.
Which files work with Video Speed Changer?
This category commonly supports MP4, MOV, AVI, MKV, WMV, FLV, WebM, and 3GP. Use the accepted file types shown in the uploader, because support varies by browser and by the engine behind each tool.
Does the audio pitch change with the speed?
It can. Check the preview with sound before downloading, because a faster tempo raises pitch unless the tool re-pitches it.
Will my original file be changed?
No. The work is done on a copy in this tab by a WebAssembly build of ffmpeg, and the result arrives as a separate download, so your original is still there if you need it.
How is my file processed?
It is not uploaded. The processing is done locally by a WebAssembly build of ffmpeg, so the practical ceiling is your device's memory and the limit shown beside the uploader - no queue, no account, no copy on a server.
Is the Video Speed Changer free?
Yes. The Video Speed Changer is free with no trial limit, subscription, or watermark on downloads. You can use it for personal and commercial projects without creating an account.