Change Video Speed Online — Slow Motion or Fast Forward, Free
File Tools Online · July 2026 · 5 min read
Sports footage that needs a slow motion replay, a long process shortened into a snappy timelapse, or a clip that's just a touch too fast to follow — changing video playback speed covers a wide range of very different needs, and this tool handles both directions: slowing footage down and speeding it up.
Slowing Down vs. Speeding Up
These are really two different use cases wearing the same tool. Slow motion is typically used for sports, dance, or aesthetic effect — catching detail the eye misses at normal speed. Speeding up is more often practical: condensing a long screen recording into a fast tutorial, or compressing hours of footage into a timelapse.
How Speed Changes Are Applied
This tool uses FFmpeg's setpts and atempo filters together, adjusting both the video timing and the audio pitch/tempo in sync — so speeding up or slowing down doesn't leave you with audio that sounds detached from the picture or comically pitch-shifted.
How to Change Video Speed Online
- Create a free account — no credit card required.
- Go to Tools → Video Tools → Video Speed.
- Upload your video and choose a speed multiplier (slower or faster).
- Download the speed-adjusted video.
- Your original file is deleted from the server within 30 minutes.
Try it free — no credit card required
10 jobs per day. No credit card required. All 140+ tools available from day one.
Use Video Speed Now →Frequently Asked Questions
Can I make a slow motion video from normal footage?
Yes — choose a speed below 1x (such as 0.5x) to slow the footage down for a slow-motion effect.
Will the audio sound strange after changing speed?
The tool adjusts audio timing alongside the video using FFmpeg's atempo filter, so pitch and tempo change together in a natural-sounding way rather than the audio simply desyncing.
Can I speed up a video for a timelapse effect?
Yes — choosing a higher speed multiplier compresses the footage into a faster timelapse-style clip.
Does changing speed add a watermark?
No, output files are never watermarked.
What's the speed range available?
Both slow-down and speed-up multipliers are supported, covering everything from slow motion to fast timelapse effects.