Upscale Image to 4K
Enlarge an image toward 4K resolution with high-quality resampling, right in your browser. The scale is set automatically from your image; nothing is uploaded.
More presets
Jump to another preset — each opens its own page ready to go:
How to upscale to 4K
- Drop in your image.
- It is scaled up toward 4K using stepped resampling.
- Download the enlarged image.
About upscaling to 4K
Upscaling to 4K enlarges your image so its longest side approaches 4K resolution, using high-quality stepped resampling. The scale is computed from your image, so a small photo is enlarged more and a large one less.
This is honest interpolation, not AI super-resolution — it makes the image larger and smoother but can’t recover detail that was never captured. Everything runs in your browser, so your photo is never uploaded. For very small sources the result may fall short of 4K, since enlargement is capped to keep quality reasonable.
Frequently asked questions
Will it really reach 4K?
It enlarges the long edge toward 4K. Very small images are capped to keep quality reasonable, so the result may be a little under 4K — interpolation can’t invent missing detail.
Is this AI upscaling?
No. It’s high-quality stepped resampling — honest interpolation that makes the image bigger and smoother, not AI super-resolution that invents detail.
Is my image uploaded?
No. Upscaling runs entirely in your browser, so your image never leaves your device.
What formats work?
JPG, PNG, WebP and more. PNG and WebP keep transparency; other formats export as JPG.