Frame interpolation for smoother, higher-FPS video
Browser-based tool for increasing video framerate via frame interpolation. Supports Motion-Compensated interpolation through FFmpeg WebAssembly and an AI mode powered by the RIFE neural network for etalon-grade smoothness.
How to increase video FPS
Drop or pick an MP4, MOV, WebM or MKV.
×2, ×3 or ×4 — the tool auto-picks the best engine for your device.
"Smoother" keeps the duration; "Slow motion" stretches time.
Final MP4 H.264. Compare before/after with the slider right on the page.
Turn 24/30 FPS into 60, 120 or 240 FPS — no installation
File queue
Download AI model?
The RIFE-v4 model (~25 MB) is downloaded once and cached in your browser.
Features
Supported formats
Input: MP4, MOV (including iPhone slow-mo .mov), WebM, MKV. Output: MP4 with H.264 codec — universal for playback and social media.
Why increase video FPS
Higher FPS makes motion look visually smoother — especially important for slow-motion (e.g. 120 FPS slowed 4× yields a smooth 30 FPS playback), gameplay capture, action-cam footage and any fast-motion scene. Interpolation computes intermediate frames between existing ones — Motion-Compensated via FFmpeg analyses motion vectors, while AI RIFE uses a neural network for semantically correct in-between frames.
Frequently asked questions
Which formats are supported?
Input — MP4, MOV, WebM, MKV. Output — MP4 (H.264).
How long does processing take?
1-5 minutes for a 30-second 1080p clip in Quality mode. AI mode is faster on WebGPU-capable devices. An exact estimate is shown before you start.
Quality or AI — which is better?
AI (RIFE) gives smoother and more semantically correct motion on complex scenes, but requires a 25 MB model download and a device with WebGPU or WASM SIMD support. Quality (FFmpeg) runs on any device.
Will the video be perfectly smooth?
On simple scenes — yes. On fast or complex motion, both modes can produce artifacts — try the AI mode for the best result.
Does the duration double?
No. Duration stays the same — only the number of frames per second increases. Audio stays in sync.
Can I make slow-motion?
Yes. Boost FPS to 120 or 240, then use the video speed tool to slow down — you get smooth slow-motion playback.
