How do 2×/3×/4× scales work?

Interpolation adds pixels—it cannot invent real detail. Smooth fits photos; nearest-neighbor keeps crisp edges.

Why does file size jump after upscaling?

Pixel count grows with the square of scale (2× → 4× pixels), so lossless PNGs balloon accordingly.

This is classic interpolation, not generative AI—good for icons and screenshots, not miracle photo restoration.

Home ToolboxImage Upscaler

Upscale image size locally with 2×/3×/4× scale and interpolation options.

Upscale image dimensions locally with 2×/3×/4× or custom scale. Smooth or nearest-neighbor interpolation.

How do 2×/3×/4× scales work?: Interpolation adds pixels—it cannot invent real detail. Smooth fits photos; nearest-neighbor keeps crisp edges.
Why does file size jump after upscaling?: Pixel count grows with the square of scale (2× → 4× pixels), so lossless PNGs balloon accordingly.
Limits vs AI super-resolution?: This is classic interpolation, not generative AI—good for icons and screenshots, not miracle photo restoration.