An oversized image slows down a website; an undersized one looks blurry once stretched to fit. Getting the dimensions right the first time avoids both problems.
Common size targets
Website hero banners typically run 1920x1080px. Blog featured images usually work well around 1200x630px, which also matches the size most social platforms use for link previews. Passport and visa photos have strict, country specific dimensions, so always check the issuing authority exact specification first.
Resizing without distorting the image
Stretching an image to a new width and height independently distorts faces and straight lines. The Image Resizer tool supports locking the aspect ratio so the image scales proportionally, then cropping separately for an exact target size.
File size versus dimensions
Resizing changes pixel dimensions, but does not always shrink file size as much as expected if format and quality stay the same. For a large photo that just needs a smaller file size, the Image Compress tool is the more direct fix.
Converting formats
If the destination requires a specific format, such as PNG for logos with transparency or JPG for photos, use the image converters before or after resizing.