Speed Up, Slow Down, Export
You recorded a 20-minute walkthrough of setting up a dev environment. Most of it is waiting for npm install. Speed the whole thing up to 4x and your 20-minute video becomes a 5-minute time-lapse that actually holds attention.
Or flip it around: you’ve got 2 seconds of a skateboard trick and want to show it in slow motion. Drop it to 0.5x and those 2 seconds stretch into 4 dramatic seconds where every detail is visible.
The Range
0.5x to 4x. The slider gives you fine-grained control, and there are preset buttons for common speeds. FFmpeg processes the speed change on the server, adjusting both video and audio.
Fair warning about audio: the pitch shifts with the speed. Slow-motion makes voices deeper. Fast-forward makes them higher. That’s just how it works, the tool doesn’t do pitch correction.
Steps
- Upload your video.
- Set the speed with the slider or presets.
- Click Change Speed.
- Download.
Real Uses
Making tutorial recaps. A 45-minute live coding session sped up to 2x becomes a 22-minute recap. People can skim through it faster and still catch the important parts. Great for sharing in team channels.
Slow-motion product reveals. A candle being lit, coffee being poured, a sneaker hitting the ground, at 0.5x these everyday moments look cinematic. Works especially well if the original was shot at 60fps, since half-speed still gives you a smooth 30fps output.
Construction and setup time-lapses. Set up a camera while building a desk, painting a room, or setting up a trade show booth. Record the whole thing, speed it up to 4x, and you’ve got a satisfying before-and-after time-lapse.
Reviewing recorded meetings. An hour-long meeting at 1.5x takes 40 minutes. At 2x, 30 minutes. If you’re just looking for the part where they discussed your project, speeding through the rest saves real time.
Content repurposing. Take a full webinar, speed it up to create a “highlights” version. Or slow down a key 10-second moment for emphasis in a social post.
Trim the video first if you only need part of it, the Video Trimmer handles that. Compress afterward if the result is too large using the Video Compressor.
FAQ
Does the audio change pitch? Yes. Faster = higher pitched. Slower = deeper. There’s no pitch correction built in. If the audio matters, this is worth considering.
What’s the speed range? 0.5x to 4x. Half speed for slow-motion, quadruple speed for aggressive time-lapses.
Does slow-motion work well on 30fps footage? It works, but at 0.5x you’re down to 15fps, which can look a bit choppy. For smooth slow-motion, start with 60fps source footage.
Does the file size change? Proportionally. A video sped up to 2x is half the duration and roughly half the file size. Slowing to 0.5x doubles the duration and file size.
Does it affect visual quality? No, the pixels aren’t altered. Only the timing of the frames changes.