About the Change Video Speed
Change Video Speed makes a clip play faster or slower and saves the result as a new file. Pick a quick preset such as 0.5, 2 or 4, or type any speed from 0.25 to 8. The tool tells you how long the new video will be. The sound is sped up or slowed down together with the picture, so the two always stay in step; as with a tape or a record, the pitch rises when it is faster and drops when it is slower. Your video is processed on your own device and never uploaded.
Updated October 2026
How to use the Change Video Speed
- 1Select the video you want to change.
- 2Tap a preset or type a speed. 2 means twice as fast, 0.5 means half speed.
- 3Look at the new length shown under the box and choose MP4 or WebM.
- 4Press Change speed and wait for it to finish.
- 5Play the preview and download the video.
Time-lapse and slow motion
Speeding a clip up turns long events into short, watchable ones. A 10 minute walk shown at 8 times speed lasts 75 seconds. Slowing a clip down lets you study a golf swing, a dance move or a cooking technique, or add drama to a moment you want people to notice.
- 2x to 4x: skip slow parts of tutorials and screen recordings
- 8x: time-lapse of travel, building or cooking
- 0.5x: study a movement or add emphasis
- 0.25x: very slow motion, best with high frame rate footage
What the speed does to sound
Changing speed changes pitch because the sound waves are played faster or slower. Doubling the speed raises the pitch by an octave; halving it lowers it by an octave. For a time-lapse this is usually fine, since the sound is just atmosphere. If you want to keep the original sound at normal speed, remove the sped up sound with Mute Video and add music with Add Audio to Video.
Choosing a speed that works
Small changes such as 1.25x or 1.5x keep speech understandable and save time when you review lectures or interviews. Beyond 2x speech becomes hard to follow. When slowing down, 0.5x is the point where most phone footage still looks natural.
Length, size and quality
The new length is the old length divided by the speed. Sped up videos are shorter and usually smaller; slowed videos are longer, and the file gets bigger with them. The picture is limited to 1080 pixels on its shorter side, and the quality is matched to your original. If you need a smaller file afterwards, Video Compressor reduces it further.
Combining with other tools
Cut the part you need first with Trim Video so you do not wait for the whole clip to be processed. To make a speed change repeat, such as a short slow motion shot played several times, follow it with Loop Video. Phone and computer both work; Chrome and Edge support the most formats.
Features
- Any speed from 0.25x to 8x
- Quick presets for common speeds
- Shows the new length before you start
- Sound and picture stay in step
- MP4 or WebM output
- Private: the video never leaves your device
Frequently asked questions
How do I make a video play twice as fast?
Type 2 as the speed. The new video is half as long. For half speed type 0.5, which makes the video twice as long.
What speeds are allowed?
From 0.25 (four times slower) up to 8 (eight times faster). That covers most time-lapse and slow-motion needs.
Does the voice sound different?
Yes. The sound speeds up or slows down with the picture, so voices sound higher when faster and deeper when slower. It does not correct the pitch.
Will slow motion look smooth?
The tool stretches the frames you recorded; it does not invent new ones. A clip filmed at 30 frames a second slowed to 0.25 may look choppy. Footage recorded at 60 or 120 frames a second slows down much more smoothly.
Can I speed up only part of a video?
This tool changes the whole clip. To change a section, cut it out with Trim Video, change its speed, and join the pieces again afterwards.
Which formats can I use?
MP4, MOV, WebM and MKV files that your browser can decode. The result is saved as MP4 or WebM.
Is there a size or length limit?
The finished video can be up to 10 minutes long. A one hour clip sped up 8 times fits, but a 10 minute clip slowed to 0.5 does not.
Is my video uploaded?
No. Everything happens inside your browser, so your video stays on your phone or computer.