Set the exact pixel size you need, or scale by percentage. Supports JPG, PNG, WebP, GIF. Aspect ratio stays locked by default so nothing gets stretched. No sign-up required.
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Most of the time it comes down to a size limit somewhere — a profile photo upload that rejects anything over a certain dimension, a marketplace listing with a maximum image size, or an email attachment that's too large to send. Phone cameras now shoot at resolutions far beyond what most of these places actually need, so resizing down is usually about matching the photo to where it's going, not about losing quality.
The other common case is the opposite: an image too small for what you need it for, like a logo that needs to go on a banner. Scaling up works, but it's worth knowing the limit — you can't add detail that was never captured in the original photo, so a small, blurry image will still look soft after resizing, just bigger.
Resizing keeps the entire photo but shrinks or enlarges it — nothing gets cut off. Cropping keeps the resolution but cuts away part of the photo to change its shape. If you need both — a square photo at an exact pixel size, for instance — start with Crop Image and resize the result afterward.