Image Tools

Image Resizer

Resize image dimensions, format, and output quality locally in the browser.

Image resizer
Processed locally with Canvas; the image is never uploaded.

Image Resizing

Resize pixel dimensions with browser Canvas and export WebP, JPEG, or PNG. Files stay in the current browser tab and are not uploaded.

Output Rules

  • Lock the original aspect ratio or set both dimensions independently
  • JPEG cannot preserve transparency, so transparent pixels are filled white
  • Quality applies to JPEG and WebP; PNG is encoded losslessly by the browser

Frequently Asked Questions

Resize first or compress first?
Resize first: a 4000px original scaled to 800px at quality 85 ends up small and sharp; compress-then-resize magnifies artifacts. Export web images at twice the display size for Retina.
Lock the aspect ratio or stretch freely?
Keep the lock to avoid distortion; free stretching is for the rare "intentionally distort to fit" case. To change the aspect ratio, crop — do it in a crop tool first, then resize here; that beats hard stretching every time.
Can upscaling make a small image sharp?
No algorithm invents detail: plain interpolation blurs, that is the information ceiling. Mild upscales (<150%) with modest sharpening pass; large factors need dedicated AI super-resolution. This tool shows the honest interpolated result.