Add a clip
Drop, paste or choose an MP4, MOV, WebM or MKV video up to 60 seconds, or load one of the sample clips.
WAVESPEED AI SLOW MOTION Videos stay on your device
100% FREE
Free AI Slow MotionSmooth slow motion from any clip.
AI draws new frames between the frames of your video, so a moment plays 2, 4 or 8 times slower and still looks smooth, not choppy.
Slow the whole clip or just the best moment, keep the sound at its natural pitch, and save MP4 or WebM. Everything runs in your browser.
2×, 4× and 8× slowerSmooth AI framesNo upload
No sign-up No upload No watermark
Make smooth slow motion from any clip
Drop a video here, or paste it
MP4, MOV, WebM or MKV · Up to 60 s and 500 MB · Nothing is uploadedOr try an example
Processed in your browser. Your video is not uploaded.AI frame model: RIFE 4.7 (MIT License). Licences
EXAMPLES
Try it with a sample clip.
Each example opens the first 3 seconds of an AI-made clip with sound. Pick a speed and compare it side by side.
THREE SIMPLE STEPS
How to make a slow-motion video
Pick the speed and the moment
Choose 2×, 4× or 8× slower, then slow the whole clip or set where the slow motion starts and ends, with a smooth ease in and out.
Compare and download
Watch the AI result next to a plain slow-down, then download your slow-motion MP4 or WebM with the sound.
TIPS
Get the smoothest slow motion
Clips filmed at 30 or 60 fps give the smoothest result: more real frames mean the AI has less to fill in.
Pick one highlight moment, like a jump, a splash or a pour, and slow it 4× or 8× while the rest plays at normal speed.
Steady shots with a clear subject look best. Keep the easing on for a cinematic speed ramp.
WaveSpeed AI
Need a clip to slow down?
Create short videos from a prompt or a still image with WaveSpeed AI, then turn their best moment into slow motion here.
Image Generator
Make the first frame or a cover image for your video.
Video Generator
Turn a prompt or a picture into a short video clip.
3D Generator
Turn a picture into a 3D model you can spin and render.
- 1,000+ AI models
- Image, video and 3D
- Pay as you go
$1 in free credits for eligible new accounts. No card needed. Generators have separate account and credit requirements. The AI slow motion maker is free.
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AI Slow Motion FAQ
Is this AI slow motion tool free?
Yes. Use it as often as you like, with no account and no watermark.
How does AI slow motion work?
An AI model looks at each pair of neighbouring frames, works out how everything moves between them and draws the frames in between: 1 new frame per pair for 2×, 3 for 4× and 7 for 8×. Each frame is then shown for the original frame time, so the moment lasts longer and stays smooth.
Why is it smoother than just slowing the video down?
Slowing a video in a player or editor repeats each frame, so motion stutters. Here every repeated frame is replaced by a new in-between picture, so a 30 fps clip slowed 4× still plays at 30 fps. Use Side by side to see both.
Can I slow down only part of a video?
Yes. Choose One moment and set where the slow motion starts and ends, or use the playhead buttons. The rest of the clip plays at normal speed, and the easing option steps the speed down and back up for a smooth speed ramp.
What happens to the sound?
It is slowed to match the video and keeps its natural pitch, so voices don’t turn deep. You can also save the slow motion without sound.
How long can the slow-motion part be?
Clips can be up to 60 seconds. On a computer with a graphics chip, a 30 fps clip can be slowed for up to 40 seconds at 4× or 17 seconds at 8×, at up to 720p. On other devices the AI runs on the processor at 640 × 360, ideal for a short highlight.
Are my videos uploaded?
No. The AI runs in your browser and the video never leaves your device. Only the AI model is downloaded the first time (about 11 MB), and your browser keeps it for next time.
Which formats can I use?
You can open MP4, M4V, MOV, WebM and MKV videos. Save the result as MP4 (H.264 with AAC sound), which plays almost everywhere, or as WebM (VP9 with Opus sound).
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