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Tool guide
This tool changes geometry, not format: you type exact numbers into the Width (px) and Height (px) fields and the browser redraws the frame at that resolution. It is what you need when a 4032x3024 phone photo will not fit an avatar slot, a platform's cover spec or an attachment limit, and installing a real editor for one picture is overkill. Any image/* file works - JPG, PNG, WebP, GIF - and the scaling is done by Canvas on your own machine. See also: crop the frame to an exact aspect ratio, bring the file down to a size limit in KB, turn a portrait shot into landscape.
For an in-article image, 1200-1600 px on the long edge is usually enough; a product card in a listing needs 600-800 px, and thumbnails 300-400 px. Aim for roughly twice the CSS width of the block: that covers high-density screens without inflating page weight.
With it on, you type one dimension and the other is derived from the source ratio, so nothing is deformed. Turn it off and Width and Height are independent, which will squash a 4:3 photo into a 16:9 box. Only uncheck it when a platform insists on exact dimensions.
No. Canvas upscaling interpolates the pixels you already have, so a 300 px image blown up to 1200 px looks soft and gains no detail. Downscaling is the honest use of this tool; for enlargement you need a higher-resolution original or an AI upscaler.
Convert centimetres to pixels using the print density: at 300 dpi, 3x4 cm is about 354x472 px. Uncheck the ratio lock, type those numbers into Width (px) and Height (px), and export. Crop the photo first if its shape differs, so the face is not squeezed.
No - this page deals with dimensions, and the export comes back as an ordinary raster image from the browser. If you specifically need another container, such as WebP instead of PNG, run the resized file through the matching converter afterwards.
Phone photos up to 12-16 megapixels are fine. With panoramas or scans beyond 8000 px per side, mobile Safari may fail to allocate the Canvas: the tab reloads and no output appears. Resize those on a desktop instead.
A raster file scales roughly with pixel count, so halving each side quarters the area and usually cuts the file by a similar factor. That is why resizing beats squeezing quality alone when you are trying to fit a hard upload limit.
Before: Source 4032x3024 px, 3.2 MB
After: 512x384 px, roughly 90 KB, ratio kept so nothing is stretched
Before: Screenshot 2560x1440 px, twice as wide as the layout
After: 1280x720 px, retina density kept and a quarter of the weight
Before: Photo 1500x1500 px, the platform wants 1200x630 px
After: 1200x630 px with the ratio unlocked, slightly squeezed vertically
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