画像アップスケーラー
2倍・4倍解像度

Free AI Image Upscaler — Real Super-Resolution Technology

Need to enlarge an image without losing quality? Our free AI image upscaler uses Real-ESRGAN — the same deep learning model behind professional tools like Topaz Gigapixel and Upscayl — to intelligently reconstruct detail and increase resolution by 2x or 4x. Unlike basic resize tools that stretch pixels, AI super-resolution actually generates new detail that wasn't visible in the original.

How AI Upscaling Works

Real-ESRGAN (Enhanced Super-Resolution Generative Adversarial Network) is trained on millions of image pairs to learn how high-resolution detail corresponds to low-resolution input. When you upscale an image, the neural network analyzes textures, edges, and patterns to reconstruct detail that a simple resize would lose. The result is dramatically sharper than traditional bicubic interpolation — text becomes readable, faces gain definition, and textures look natural rather than blurry.

When to Use 2x vs 4x Upscaling

2x upscaling is ideal for most use cases: social media posts, web graphics, presentations, and light print work. It doubles your image dimensions while maintaining excellent sharpness. 4x upscaling is best when you need maximum size — large prints, banners, or when your source image is very small. Keep in mind that 4x scales the pixel count by 16x, so results depend heavily on the source quality.

Tips for Best Results

• Start with the highest quality source image available
• PNG images produce better upscaling results than heavily compressed JPEGs
• For photos, 2x usually provides the best quality-to-size ratio
• For illustrations, logos, and text, 4x works great due to clean edges
• Consider using our image merger to combine upscaled images into collages