Upscale Your Video to 4K with AI

A regular resize (lanczos / bicubic / nearest) stretches the existing pixels — the result has the same amount of information, just bigger. Real-ESRGAN is a deep learning model trained on millions of images to generate plausible missing detail: sharp edges, fine textures, realistic skin and foliage. Side-by-side, AI upscale looks dramatically crisper, especially on faces and text.

AI upscaling is per-frame inference, so cost scales with frame count. On a laptop with Chrome and a modern GPU (RTX 30+, M1+) you get roughly 1–2 seconds per 1080p frame. A 15-second 30 fps clip takes ~10 minutes. On a phone it's 3–5× slower — the tool works, but for long clips a laptop is much better. The Upscale button shows an estimated time before you commit.

WebGPU is the API the AI model needs to run on your GPU. It ships in Chrome 113+, Edge 113+, Opera 99+, and recent Yandex Browser — on desktop and Android. Safari has WebGPU behind a flag on macOS. Firefox is shipping it gradually. If your browser doesn't have it, the upscaler falls back to CPU inference — slower, but it works.

Yes — every source frame is upscaled, regardless of frame rate. A 60 fps clip just takes twice as long as a 30 fps clip of the same length. The output preserves the source frame rate exactly.

HDR (HDR10, HLG, Dolby Vision) is automatically tonemapped to SDR rec.709 before the AI sees it — Real-ESRGAN was trained on SDR images and would clip wide-gamut highlights. The result is a clean, correctly-exposed SDR video.

Processing runs in your browser — the AI inference happens locally on your device. We do log anonymous performance events (frame count, scale, inference time) to spot bugs and improve speed. See our Privacy Policy.

Real-life footage with clear detail benefits the most — faces, text, foliage, fabric textures. Compressed sources (YouTube downloads, phone videos) gain dramatically. Already-sharp 4K sources gain less. Heavily compressed or motion-blurred frames produce less impressive results — the AI can't invent detail that was never captured.

The model is fixed at ×4. From a 1080p source that gives you 4320p (above 4K) — which the tool keeps with the "×4" scale option. From 1440p you'd get 5760p. The "Up to 4K" option caps the final size at 4K for sources where ×4 would be excessive.