Image
Image Upscaler
Enlarge an image with high-quality resampling and a sharpening pass.
Worth being honest about upfront: this is resampling, not the AI super-resolution that a service with a server and a trained model can offer. Nothing here invents detail a photo does not have — that kind of upscaling needs a model that has learned what edges and textures “usually” look like, run on a server, which is exactly the kind of upload this site does not do.
What this does do properly: scale the image up using the browser's high-quality resampling rather than a naive nearest-neighbour stretch, then run a real sharpening convolution over the result to put back some of the edge contrast that any resize softens. It is the same idea behind the “sharpen after resize” step long recommended in photo editing — done automatically, locally, and it is a genuine improvement over a plain resize, just not magic.
How to use it
- Choose an image.
- Pick a scale — 2x, 3x or 4x the original dimensions.
- Adjust the Sharpen slider. 0 is a plain resize; higher values fight the softness more aggressively but can start to look artificial past a point — 3 or 4 is a reasonable start.
- Choose an output format and press Upscale, then Download.
Questions
Will this make a blurry photo sharp?
No — it will make an enlarged photo look less soft than a plain resize would, by increasing contrast at edges that are already there. It cannot recover detail that was never captured; a genuinely blurry or low-resolution source will still look like a bigger version of itself.
How is this different to just resizing bigger in the image resizer tool?
The image resizer scales without the sharpening step, which is the right choice when you want a faithful, uninterpreted resize. This tool is specifically for the case where you are scaling up and want the result to look as crisp as resampling allows.
Why does high sharpening look harsh or introduce haloing?
That is inherent to convolution-based sharpening at any strength — push it too far and light or dark fringes appear next to strong edges. Keep it in the lower half of the slider for a photo; a screenshot or line art can usually take more.