Video speed changer: slow down or speed up a video
Choose a video, pick a speed from a quarter to four times normal, and press the button. A new video at that speed is saved.
Free · no signup Runs in your browser
How do I speed up or slow down a video?
Choose your video, pick the speed (0.5× is half speed, 2× is twice as fast), and press Change the speed. The tool plays the video at that speed and records it, so a 1-minute video at 2× becomes a 30-second one and at 0.5× a 2-minute one. The sound is kept in pitch where your browser supports it. Your video is processed in your browser and never uploaded.
Why we built this tool
Changing speed is one of the simplest and most useful edits: speeding up a long slow process (a drawing, a build, a repair) into a short clip; slowing a quick moment (a golf swing, a dance step, a goal) to study it; playing back a lecture or a tutorial faster; or fitting a clip into a time limit. A video editor can do it, but needs installing, and online tools tend to upload the whole video. This tool records the video as it plays at the speed you pick, in your browser, and it can trim at the same time.
Your video is processed in your browser. Nothing is uploaded, and there is no watermark.
How it works in detail
Browsers can play a video at a different rate, and the tool uses that: it sets the player's playback rate (from 0.25 to 4), plays the part you chose, draws each frame on a canvas and records the canvas and the sound. The result plays at normal speed but shows the action faster or slower. A 60-second clip at 2× is recorded in 30 seconds; at 0.5× it takes 120 seconds. Browsers keep the pitch of the sound when the rate changes ('pitch correction'), so speech does not sound like a chipmunk; at the extremes (0.25× or 4×) it can sound rough or be left out. When you slow a video down you cannot add detail that was not filmed, so a 30 frames-per-second clip at 0.5× will show each frame twice and look slightly jerky; very slow motion looks best when filmed at a high frame rate.
How to use it
- Choose your video.
- Pick the speed. Optionally set a start and end to change only part of it.
- Choose the quality and format.
- Press Change the speed and keep the tab open. The time remaining is shown.
- Play the result and download it.
Use cases
- Making a time-lapse from a long recording
- Slowing down a sports or dance clip to study the movement
- Playing a lecture or tutorial at 1.5× or 2×
- Fitting a clip into a time limit
- Slowing a fast phone clip for a closer look
- Speeding up a boring part of a screen recording
Problems you may run into
Most trouble is about the extremes and time.
| What you see | Likely cause | What to do |
|---|---|---|
| It says it cannot read my video | The browser cannot play that codec (for example HEVC/H.265 in some browsers, or a camera's special format) | Try Chrome, Edge or Safari, or convert the file to H.264 MP4 first |
| It takes as long as the video | The video is recorded as it plays; there is no shortcut in a browser | Use a shorter clip, or start it and leave the tab in front while you do something else |
| The output stops or the picture freezes | The tab was hidden, the computer went to sleep, or it ran out of power | Keep the tab open and visible, plug in a laptop, and run it again |
| There is no sound in the result | The sound option was off, the video has no sound, or the browser blocked audio until you clicked | Check the box is off, press the button yourself, and try again |
| The quality is a little lower than the original | The video is decoded and encoded again, which always costs some quality | Choose High or Very high quality, and keep your original file |
| The file is WebM and my app wants MP4 | Most browsers can only record WebM | Choose MP4 where your browser offers it (recent Chrome, Edge, Safari), or convert the file afterwards |
| Speech sounds odd at 4× or 0.25× | Pitch correction has limits | Use a speed between 0.5× and 2×, or remove the sound |
| Slow motion looks jerky | The clip was not filmed at a high frame rate | Use a smaller slowdown, or film at 60 frames per second or more |
Privacy and rights
The video stays on your device. A sped-up or slowed-down copy is still the same recording, so the same privacy and copyright rules apply to sharing it.
How it works
The video is played, redrawn and recorded again in your browser.
1. The video is opened in a hidden player in your browser; nothing is uploaded.2. The player runs from the start point while each frame is drawn on a canvas (turned, resized or mirrored if you asked).3. The browser's MediaRecorder records the canvas and the sound as a new video.4. When the end point is reached the file is finished and offered as a download.
This uses the browser's own encoder, so the output is WebM (VP8/VP9) or, in browsers that can record it, MP4 (H.264). It is a new encoding, not a lossless cut, so there is a small quality cost, and the work takes about as long as the part you choose. The tab must stay open and visible. Very long videos (over about an hour) may exhaust memory; cut them into parts first. Files protected by copy protection (DRM) cannot be processed. Speed is limited to 0.25× to 4×, the range browsers support.
Example: a time-lapse of a 10-minute task
A 10-minute recording of a painting is sped up 4 times.
- Speed4×
- Output length10 minutes ÷ 4 = 2.5 minutes
- Time to processabout 2.5 minutes
A 2.5-minute time-lapse
Remove the sound if it sounds odd at 4×.
Terms on this page
- Playback rate
- How fast a video plays compared with normal: 2 means twice as fast.
- Time-lapse
- A video that shows a slow process sped up.
Common questions
Is it free, and is my video uploaded?
It is free, and your video is processed in your browser and never uploaded.
What speeds are available?
From 0.25× to 4× normal speed.
Does the pitch of the sound change?
Browsers usually keep it natural. At the extremes it may sound rough.
Why does a slow-motion video look jerky?
You cannot add frames that were never filmed. Film at a high frame rate for smooth slow motion.
Can I change the speed of only part of a video?
Set the start and end to change one part, then join the parts in an editor.
Is the speed change lossless?
No. The video is recorded again, so there is a small quality cost.
Is anything I enter sent to a server?
No. The calculation happens in your browser and nothing you type leaves your device.
Where these numbers come from
- MDN Web Docs — HTMLMediaElement.playbackRate How a browser plays a video faster or slower, and how it keeps the pitch of the sound.
- MDN Web Docs — MediaRecorder How a browser records a stream, and isTypeSupported() for choosing a format.
- MDN Web Docs — HTMLCanvasElement.captureStream() How frames drawn on a canvas become a video stream that can be recorded.
Last verified 2026-10-25 The method on this page is checked against the sources above at least once a year. Spotted something out of date? Tell us and we will fix it.
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