AI Slow-Motion Video
Runs in your browserSmooth slow-motion with AI optical-flow frame interpolation — no more choppy duplicated frames.
When AI slow-motion shines
Sports and action
That one second of the shot, the skate trick, the goal — stretched into something you can actually watch. Real intermediate frames make fast motion readable without strobing.
Product demos
A pour, a click, a swipe — whatever tiny moment sells the product. AI slow-mo keeps textures sharp instead of smearing the way frame-blending does.
Social media drops
Reels and TikTok beats hit harder on well-timed slow-mo. You don’t need a phone that shoots 240fps — shoot at 30fps and slow it down after.
Nature and hobbies
Wings flapping, waves breaking, a flame settling. Things that happen faster than the eye resolves — now you can see the shape of them.
How It Works
Upload a short clip
Up to 10 seconds. MP4, MOV, WebM — anything your browser can decode.
AI invents the missing frames
RIFE computes optical flow between each pair of frames and synthesizes genuine intermediates on your GPU.
Download the slow-mo
2×, 4×, or 8× slower, ready as MP4 or WebM. Never leaves your device.
Frequently Asked Questions
How is this different from the Video Speed Changer?
The speed changer at 0.25× just plays the same frames for longer — you see the same 30 frames, each held for 4× as long, which looks like stuttery stop-motion. This tool generates new, genuinely in-between frames with AI so motion stays smooth.
Why is it so slow compared to the other video tools?
Each synthesized frame runs a neural network on your GPU. A 5-second 720p clip at 4× means ~450 AI inferences. Even on a fast desktop GPU that's a minute or two; on a laptop integrated GPU it's longer. Start small — try 2× at 384px to feel the speed, then scale up.
Does it work on my phone / iPad / Safari?
Not yet. The tool needs WebGPU, which is currently only available on desktop Chrome, Edge, and Chromium-based browsers (version 113+). Safari and Firefox are working on WebGPU support but aren't ready yet. You'll see a clear message if it won't run on your device.
Is there a file size or length limit?
10 seconds of source video and 720px max resolution in v1. Longer clips would eat too much memory — we load every decoded frame before encoding. We'll relax this once we move decode-encode into a streaming pipeline.
What happens to my video?
Nothing leaves your browser. The AI model and video decoder both run client-side, same as every other browser tool on this site. No uploads, no accounts.
Which AI model does this use?
RIFE v4.9 (Real-Time Intermediate Flow Estimation), exported to ONNX and run via ONNX Runtime Web with the WebGPU backend. The model is ~20MB and gets cached by your browser after the first run.