Image Resizer
Resize images to exact pixel dimensions or by percentage, with optional aspect-ratio lock.
Change an image's dimensions to an exact width and height, or scale it by percentage. Lock the aspect ratio to avoid stretching, then download the result. Processing is local to your browser.
Keeping images sharp
Downscaling — making an image smaller — always looks good because you're throwing away detail you don't need. Upscaling can't invent detail that isn't there, so enlarging a small image tends to look soft. When precise dimensions matter, start from the largest original you have and size down.
Aspect ratio
The aspect ratio is the relationship between width and height. Lock it (the default) and changing one dimension updates the other automatically, so nothing gets squashed. Unlock it only when you deliberately want to force a shape and don't mind distortion.
Choosing dimensions for the web
Serving an image larger than it will ever display wastes bandwidth and slows the page. Match the pixel dimensions to the largest size the image actually appears at — accounting for high-density screens, which may want roughly double. Common targets include full-width hero images around 1600–2000 px wide, in-article images near 800–1200 px, and thumbnails a few hundred pixels across. Resize down from a high-quality original and the result stays crisp.
Resizing without wrecking your image
The safest resize is nearly always downward. Shrinking a large photo discards pixels the eye won't miss and produces a crisp smaller image. Enlarging is the opposite: the browser has to invent pixels that were never captured, and the result softens or turns blocky. If you need a large final image, start from the highest-resolution original you have rather than blowing up a thumbnail — no tool can restore detail that was never there.
Aspect ratio is the other thing people get wrong. Change width and height independently and circles become ovals and faces stretch. Keeping the ratio locked — resizing by a single dimension and letting the other follow — preserves the proportions your image was shot with. Decide your target based on where the image will live: a social banner, a product thumbnail, and an email header all have known dimensions worth matching exactly, so the platform doesn't crop or squash your work after you upload it.
Frequently asked questions
Will resizing distort my image?
Not with 'Lock ratio' on — width and height scale together. Unlock it only if you intentionally want to stretch the image to a fixed shape.
Can I make an image larger?
Yes, but upscaling can't add detail that isn't in the original, so enlarged images may look soft. Downscaling keeps things crisp.
What's the difference between resizing and cropping?
Resizing scales the whole image to new dimensions. Cropping removes parts of the image to change its shape or framing. This tool resizes; it keeps all the content and changes the size.
Why does my resized image look blurry?
Almost always because it was enlarged. Upscaling can't create detail that wasn't captured. Start from the largest original available and size down for sharp results.
Why does my enlarged image look blurry?
Enlarging forces the software to generate pixels that weren't in the original capture. For sharp results, always resize down from the largest source image you have.
Last updated: 2026-01-15