Upscale Images 2× or 4× Online — AI Enhance, Private
Increase the resolution of any image 2× or 4× right in your browser. The default mode uses high-quality canvas interpolation for instant results. Enable AI enhancement to run a Real-ESRGAN neural network that reconstructs finer detail and edges — ideal for restoring small or low-resolution photos.
Fast mode vs AI mode
- Fast (default): bicubic canvas upscale. Instant, zero downloads, works on any device.
- AI enhance: tile-based Real-ESRGAN inference via ONNX Runtime Web. Better detail recovery; downloads the model once (~20MB, then cached).
Frequently asked questions
How does the upscaler work?
The default mode uses high-quality canvas bicubic interpolation for instant 2× or 4× upscaling. The optional AI mode runs a Real-ESRGAN model via ONNX Runtime Web to recover sharper detail on low-resolution images.
Is my image uploaded anywhere?
No. All processing happens locally in your browser. In AI mode the model file is downloaded once to your browser cache, but your image never leaves your device.
Why does AI mode take longer?
AI super-resolution runs a neural network tile-by-tile on your device. The first run downloads the model (~20MB), after which it is cached. Large images take proportionally longer.