Free Online Image Upscaler (RealCUGAN) tool icon
Image tools · Image upscaler

Free Online Image Upscaler (RealCUGAN)

Upscale images by 2× or 3× directly in your browser. When available, RealCUGAN (WebAssembly, local CPU) is used for AI upscaling; otherwise the tool falls back to a high-quality resize mode. All processing is done locally with no uploads.

Runs entirely in your browser
RealCUGAN / Resize

Image upscaler: uses RealCUGAN (WebAssembly, local CPU) when available (no uploads). If unsupported, it falls back to high-quality resize.

Original
Original
Output
No output yet

How to Use

  • Upload Image: Click 'Choose image' or drag & drop your file onto the page.
  • Select Mode: 'RealCUGAN' (AI upscaling) is recommended for best quality; 'High-quality resize' is faster and more compatible.
  • Configure: Choose the scale factor (2x/3x) and denoising level (None/Strong/Conservative).
  • Process: Click 'Process' and wait for the local AI computation to finish (may take time for AI mode).
  • Download: Preview the result and click 'Download' to save the upscaled image.

Tips & FAQ

  • Local AI Processing: Powered by RealCUGAN-ncnn-webassembly, this tool runs entirely in your browser. No images are uploaded to any server, ensuring 100% privacy.
  • Hardware Requirements: AI upscaling is computationally intensive. A device with a dedicated GPU is recommended. Older devices may experience lag.
  • Best Results: The RealCUGAN model is optimized for anime-style images and illustrations, producing the best results for this content type.
  • Compatibility: AI mode requires a browser that supports SharedArrayBuffer (Cross-Origin Isolation). If you see an error, switch to 'High-quality resize' mode.
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