Image Resizer
Change image width and height directly in the browser. Lock the original aspect ratio for proportional resizing or enter independent dimensions when stretching is intentional.
Output dimensions800 × 600px
Megapixels0.48 MP
How this tool works
With aspect lock enabled, new height = new width ÷ original aspect ratio. The browser resamples the decoded image to the requested canvas dimensions.
Example
A 2400×1600 image has a 3:2 ratio. Setting width to 1200 with aspect lock gives a 1200×800 output.
Common questions
Can resizing increase image quality?
No. Enlarging creates more pixels by interpolation but does not recover detail that was not present in the source.
What format is the download?
This tool exports the resized result as PNG so dimensions are preserved without another lossy encoding step.