NexusCompress · AI image upscaler FAQ
Enlarge photos 2× or 4× with Real-ESRGAN — not stretched pixels. The AI Upscaler runs entirely in your browser; images are never uploaded to a server.
AI upscale vs normal resize
Bicubic or Lanczos resizing only interpolates between existing pixels, which often looks soft or blurry when enlarged. Real-ESRGAN is trained on image pairs to reconstruct plausible detail — textures, edges, and fine structure — on your device via ONNX Runtime Web.
Best use cases
- Old low-resolution family photos
- Product images from suppliers
- AI-generated art before printing
- Scanned documents before portal upload
Privacy & offline use
The model file (~5 MB) downloads once and is cached locally. After that, upscaling can run without an internet connection. Inference runs in a Web Worker so the page stays responsive.
How to upscale
- Open AI Upscaler.
- Upload JPEG, PNG, or WebP.
- Choose 2× or 4× and export JPEG or PNG.
- Use the before/after slider to compare results.
Frequently asked questions
How is AI upscaling different from regular resizing?
Standard resizing interpolates pixels; Real-ESRGAN reconstructs detail with a neural network — in your browser on NexusCompress.
What is the best use case for AI upscaling?
Photos, portraits, product shots, old scans, and AI-generated images you need at print resolution.
Does the upscaler work offline?
Yes, after the model is cached on first use. No further uploads are required.