Slow down a video online, free: the page opens at 0.5× to turn a clip into slow motion, and goes as low as 0.25×. Every original frame is kept and shown for longer, with nothing re-compressed, so the picture stays exactly as sharp as the source. How smooth it looks depends on how the clip was filmed: 60 fps footage at half speed still plays at 30 fps, while a 30 fps clip at 0.25× drops to 7.5 fps and stutters, because no in-between frames are invented. Kept audio slows down and drops in pitch, or you can drop it. Nothing is uploaded.
How it works
- Drop the video, or up to 20 clips. It opens at 0.5×, half speed.
- Go slower with 0.25×, or type a value such as 0.75 for a gentler slow-down, then keep or drop the audio.
- Press Process & download. The slow-motion MP4 saves with its new, longer duration shown.
Questions
- How do I slow down a video without changing the pitch?
- Not in one step here. Kept audio is resampled with the picture, so slowing the video also lowers its pitch, like tape played slow. For speech at its normal pitch, choose Drop audio, save the soundtrack with the audio extractor, slow it with the audio speed changer, which keeps pitch down to half speed, and put the two back together in a video editor.
- Why does my slow-motion video look choppy?
- Because no frames are made up. Slowing a clip spreads its real frames over more time, so the playback frame rate falls by the same factor: 30 fps at 0.5× is 15 fps. For smooth slow motion, start from footage shot at 60 fps or higher, or slow it less; 0.75× of a 30 fps clip still plays at 22.5 fps.
- Does my file get uploaded?
- No. The models and all processing run inside your browser on your own device. You can verify this yourself: open your browser’s DevTools, watch the Network tab, and process a file: there are no uploads. After the first visit most tools also work fully offline.
- Does rotating re-encode the video?
- No. The rotation is written into the MP4’s orientation metadata and the frames are copied unchanged, so it is near instant and loses no quality. A few third-party players ignore that flag; browsers and phones honour it.
- What happens to the audio?
- Rotate keeps it untouched. Reverse always drops it, since reversed speech is rarely what anyone wants. Speed changes keep it in sync, or you can drop it with one switch.