Resizing Images by Pixels, Percentage, Preset, or Ratio
What this tool does
Resizing an image means changing its pixel dimensions. This tool gives you four ways to specify the new size: type an exact Width and Height in pixels, scale by a percentage of the original, pick a Preset built for a specific platform, or lock to an aspect Ratio such as 16:9 or 1:1. The picture is redrawn inside your browser, and the result is saved as JPEG, PNG, or WebP so you can download a file that fits wherever it needs to go.
When to use each mode
Reach for the Percent mode when you just want a lighter copy — dropping a 4000px camera photo to 40% is usually enough to email or post it without the multi-megabyte weight. The Pixels mode suits hard requirements, like a header that must be exactly 1200 wide. Presets cover the sizes that platforms keep changing — profile pictures, thumbnails, cover images — so you don't have to memorise them. Ratio mode is for reframing to 16:9 or squaring an image to 1:1 for a grid.
A concrete example
Say you have a 3024×4032 phone photo that a form will only accept up to 1080px tall. Switch to Pixels, keep Maintain aspect ratio ticked, and set Height to 1080; the Width fills in as 810 automatically so nothing stretches. Choose WebP at around 80% quality, press Resize Image, and the result panel shows the new dimensions and the file size before and after, with a divider to compare the result against the original, before you download.
Notes and edge cases
Maintain aspect ratio is the switch that protects you from squashed faces and warped logos — turn it off only when you deliberately want a fixed shape regardless of the source. Enlarging beyond the original resolution can't recover detail that was never captured, so upscaling a small image will look soft; downscaling is where the tool shines. The quality slider mainly affects JPEG and WebP, trading file size against visible artefacts, while PNG stays lossless and is the right pick for screenshots, logos, or anything with sharp edges or transparency. Two neighbouring jobs often begin here: pages exported with the PDF to Image converter usually arrive far larger than a web page needs, and a logo headed for the PDF watermark tool should be scaled down before it is stamped onto a page.