Image Upscaler

Free

Upscale images 2× or 4× using ESRGAN deep learning super-resolution. Runs entirely in your browser with TensorFlow.js.

Tool workspace

Upload an image to upscale

Super-Resolution

ESRGAN Architecture

ESRGAN (Enhanced Super-Resolution Generative Adversarial Network) was introduced in 2018 and won the PIRM challenge. It uses a deep residual network with 23 blocks to hallucinate realistic high-frequency details that traditional interpolation methods simply blur.

Browser AI is Real

TensorFlow.js brings GPU-accelerated neural networks to the browser. Your graphics card runs the same ESRGAN model that would normally require a cloud server — no upload, no queue, no API key. The first load takes a few seconds, then it is instant.

2× vs 4×

A 2× upscale quadruples the pixel count (double width × double height). A 4× upscale multiplies it by 16. For photos under 500×500 pixels, 4× is transformative. For larger images, 2× usually preserves the best balance of detail and file size.
Pro Tip: ESRGAN works best on photos and artwork. It may introduce artifacts on screenshots with sharp text or UI elements. For those, traditional pixel-doubling often looks cleaner.
All processing happens in your browser. Your files are never uploaded to any server.
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