AI Image Super Resolution
Drag & drop images here, or click to browse (multiple supported)
JPEGPNGWebPMulti-file
Max file size: 10MB per image
Powered by ESPCN Deep Learning Model
Drag & drop images here, or click to browse (multiple supported)
4x IMG ZIP is a completely free online AI image upscaling tool powered by the ESPCN (Efficient Sub-Pixel Convolutional Neural Network) deep learning model. It intelligently upscales images by 4x while preserving sharp details and image quality. All image processing is done locally in your browser — no files are ever uploaded to any server, ensuring complete privacy.
AI image super resolution uses deep learning neural networks to reconstruct high-resolution images from low-resolution sources. Unlike traditional interpolation methods (bilinear, bicubic), AI super resolution intelligently fills in missing details, producing clearer and more natural-looking results.
ESPCN (Efficient Sub-Pixel Convolutional Neural Network) is a lightweight super resolution model known for its fast processing speed and excellent results. It uses sub-pixel convolution layers for efficient upsampling, making it ideal for real-time browser-based image processing without requiring expensive GPU servers.
Your images never leave your device. This tool uses WebAssembly and ONNX Runtime to run AI inference directly in your browser. No account registration required, no file uploads, completely free to use.
Perfect for restoring old photos, upscaling low-resolution images, optimizing web graphics, enhancing design assets, and preparing images for social media. Supports JPEG, PNG, and WebP formats with a maximum file size of 10MB.
The ESPCN model effectively restores image details, maintaining clarity even after 4x upscaling. Results are particularly impressive for natural images like landscapes and portraits. You can also try the "HD Enhance" mode, which shrinks the 4x upscaled image back to the original size for an even sharper result.
The first time you use the tool, the AI model file (~5MB) needs to be downloaded. After that, processing speed depends on your device. Typically, one image takes a few seconds to process. We recommend using Chrome or Edge for the best performance.
Currently, JPEG, PNG, and WebP formats are supported for input. Processed images are output in PNG format to ensure lossless quality.
Yes! You can select or drag and drop multiple images at the same time. They will be processed sequentially and results will be displayed together.