# Make a video slow motion > Slow any clip to half or quarter speed — analyze a golf swing, dance move, or highlight in detail. Speed up or slow down any video or audio from 0.25× to 4×, keeping audio pitch natural so voices do not sound chipmunked or slurred. Runs locally in the browser; no upload. ## 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 ### How slow can I go? 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. ### Will the slow motion look smooth? 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. ### What happens to the audio in slow motion? 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. ### Is it really free? 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. ### Do you upload my files? 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. --- _Free · No sign-up · No watermark · Runs entirely in your browser — your file never leaves your device._ - Open this tool: https://easydub.video/tools/speed/slow-motion-video - All free EasyDub tools: https://easydub.video/tools