Image resizer

How resizing works — and when to use it

An image's dimensions are its width and height in pixels. A modern phone photo might be 4032 × 3024 pixels — wonderful for printing, but far larger than a website, social platform or document needs. Resizing redraws the image at the dimensions you choose, producing a file that fits its destination exactly and usually weighs far less, too.

This tool keeps the aspect ratio (the relationship between width and height) locked by default: type a new width and the height adjusts to match, so nothing is squashed or stretched. Unlock it only if a destination demands an exact box and you accept some distortion — for example, forcing a banner to precise dimensions.

Common sizes people resize to

• Social media: 1080px wide suits most feeds; profile pictures are usually displayed small, so 400–800px is plenty.
• Websites: content images at 800–1280px wide balance sharpness and loading speed.
• Email and documents: 600–800px wide keeps attachments light and pages tidy.
• Forms and portals: many ask for a maximum dimension or file size — resize first, then compress if the file is still too heavy.

A word of honesty: enlarging an image cannot invent detail that was never captured. You can make a small image bigger in pixels, but it will look soft. For best results, start from the largest original you have and shrink down. Our walkthrough on how to resize an image online without software covers the process step by step.