How to upscale an image
Making a small picture bigger the old way just blurs it further. Here is what an AI upscaler does differently, and a free one that runs in the browser.
Why stretching a small picture looks bad
Ordinary resizing, whether in an editor, a browser or a phone's Photos app, works by blending the colours of neighbouring pixels to fill in the new, larger space. It has no more real detail to work with than the original had, so the bigger the enlargement, the softer and blockier the result looks, especially around edges and text.
What an AI upscaler does instead
A model like Real-ESRGAN is trained on millions of pairs of sharp and degraded images, so instead of blending pixels it predicts what the sharp version of a small or JPEG-compressed picture probably looked like: it draws cleaner edges, smoother gradients, and plausible fine texture in skin, fabric or foliage, while removing JPEG blocking as it goes.
In Photoshop
Photoshop's Super Resolution, built on similar AI upscaling, does a comparable job to a dedicated web upscaler but needs a Creative Cloud subscription and the desktop app open, which is a lot of overhead for enlarging one photo or logo.
Upscaling without uploading the photo
Stayput's AI image upscaler runs Real-ESRGAN directly in the browser tab: drop a picture and enlarge it 2×, 3× or 4×, with the result held under 16 megapixels, the largest size a browser can reliably hold and save. Ready-made pages are set up for the common cases, increasing resolution for print or enlarging a small logo or thumbnail at 2× by default, and PNG or WebP output keeps a transparent background intact.
Questions
Does upscaling actually add detail, or just make the picture bigger?
An AI upscaler adds plausible detail, sharp edges and reduced compression artefacts, unlike a plain resize which only spreads existing pixels thinner. It cannot recover detail that was never captured, such as text too small to read in the original.
Is there a free AI upscaler with no upload?
Yes, Stayput's upscaler runs the model in the browser, so the photo is processed and enlarged on your own device rather than sent to a server.
What is the biggest size it can output?
Results are capped around 16 megapixels, the largest image size browsers can reliably hold in memory and save; a very large source photo may reach that cap before the full 4× factor.
Does it keep a transparent background?
Yes, when saving as PNG or WebP; choosing JPG puts the picture on a white background instead, since JPG cannot store transparency.