Experimental Online Image Upscaler (2×/4×)

Upscale photos with an experimental AI super-resolution entirely in your browser. Private, fast, and free—no uploads. Choose 2× or 4×, with tiling for big images.

Upload Image

Drop, select, or paste an image to start.

  • Runs locally with WebGPU/WebGL/WASM
  • 2× / 4× experimental super-resolution
  • Tiled processing to fit device memory
  • Optional edge-aware sharpen
  • Progress and engine indicator
  • Private—no uploads, no tracking of files

Why Use ImgTool.app’s AI Upscaler?

Private & Local

Everything happens in your browser. Your images never leave your device—perfect for sensitive work.

Fast on Modern Browsers

Uses WebGPU/WebGL when available, with a WASM fallback—plus tiling to fit your device memory.

Quality Controls

Choose 2×/4×, pick a quality-vs-speed model preset, and optionally add edge-aware sharpening.

Great for Thumbnails

Upscale small assets for web, thumbnails, or prints with stronger edges and reduced blockiness.

No Account Needed

Free and simple—drag & drop or paste an image and go.

Open Model Options

Powered by ESRGAN-style models via UpscalerJS—swap presets to suit your device and image type.

Tips

  • Start with 2× for speed; switch to 4× for maximum detail.
  • Portraits: avoid over-sharpening; landscapes: try mild sharpen.
  • If edges look tiled, raise the overlap a bit (e.g., 32).

AI Upscaler FAQ

Yes. The upscaling runs 100% in your browser using WebGPU/WebGL/WASM. No images are uploaded.

2× and 4×. 2× is faster and uses less memory; 4× provides more detail.

JPG, PNG, and WebP are recommended. HEIC/AVIF may work depending on your browser’s support.

Lower the tile size (e.g., 256 → 192), keep overlap around 20–32, or choose 2× scale.

AI super-resolution synthesizes plausible detail. For technical imagery, use conservative settings or disable AI sharpen.

Looking to reduce file sizes? Try our image compressor or image converter.