Ever watched a video that looks choppy, stuttering, or just not smooth enough? Fast Frame Interpolator uses the RIFE v4.9 AI model to generate new intermediate frames between existing ones — doubling, quadrupling, or even 8× your video's frame rate. THE DIFFERENCE: This app runs the AI model entirely on your device. No uploads, no cloud processing, no subscription. Your videos stay private. How it works: 1. Select any video file (MP4, AVI, MKV, MOV, WEBM, WMV) 2. Choose your frame rate multiplier (2×, 4×, or 8×) 3. Tap "Enhance Frame Rate" and watch the AI work 4. Save the smoother, higher-fps result What makes it smart: • RIFE v4.9 AI — state-of-the-art neural network for optical flow estimation • Real-time progress tracking with frame count and ETA • Audio preservation — your original soundtrack stays intact • Drag-and-drop or file picker — your choice • Cancel anytime during processing Perfect for: • Smoothing old 24fps or 30fps footage to silky 60fps or 120fps • Creating better slow-motion effects from standard video • Upgrading game recordings, drone footage, or phone videos • Making animations and stop-motion look professionally smooth Everything runs locally on your PC using CPU inference. No internet required, no data leaves your machine, no account needed. Part of the "Fast" tools family — simple, focused, powerful.