Make a video slow motion
Slow any clip to half or quarter speed — analyze a golf swing, dance move, or highlight in detail.
Free · No signup · Files never leave your device
Drag and drop a video or audio file
or click to browse
Other speeds
How it works
Drop your file
It stays on your device — nothing is uploaded.
Processed locally
The speed is changed right in your browser via WebAssembly — audio pitch stays natural.
Download the result
Preview the new speed and download for free — no watermark.
See what full speed hides
Slow motion is the simplest analysis tool there is: a tennis serve, a barista pour, a dance eight-count, a product unboxing moment — at 0.5× the details you argue about become plainly visible. Coaches slow training footage for form review, editors slow highlights for emphasis, and makers slow build clips so viewers can actually follow.
Everything happens locally in your browser: pick 0.5× (or push to 0.25×), convert, and download a real slow-motion file that plays everywhere — no editing suite, no upload, and your footage never leaves your device.
Frequently asked questions
Down to 0.25× — a quarter of the original speed. 0.5× is the natural pick for most footage; 0.25× works best on clips shot at high frame rates.
Frames are shown longer rather than artificially interpolated, so smoothness depends on the source frame rate: 60 fps phone footage looks great at 0.5×, while 24–30 fps video gets visibly steppier the slower you go. No fake in-between frames means no warping artifacts either.
It is time-stretched to match: everything plays at half tempo but keeps its original pitch, so voices sound slowed rather than demonically deep. You can also tick "Remove the audio track" for a silent slow-mo clip.
Yes. The speed changer is completely free, with no signup, watermarks, or limits. We make money from our video translation service, not from this tool.
No. The speed change happens locally in your browser using WebAssembly. Your file never leaves your device — you can even disconnect from the internet once the page has loaded.