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How to Resize an Image to Exact Dimensions
Upload forms demand exact sizes ('1200 × 630'), marketplaces crop the unexpected, and huge camera photos slow websites down. Resizing changes an image's pixel dimensions without stretching it. This guide shows the three ways to resize — by width and height, by percentage, and by target width with the ratio locked — and which one your situation needs.
Step by step
- Open the Resize Image tool and add your image — its current dimensions are shown.
- Set the new size: type width and height, or a percentage, or just a target width (height follows automatically when the ratio is locked).
- Resize and download the new image.
Try it now — free, no sign-up
Open the Resize Image tool
Open the Resize Image tool
Tips for better results
- Keep 'lock aspect ratio' on unless you deliberately want to stretch — unlocked resizing is how logos end up squashed.
- Common sizes: website hero 1920px wide, blog images 1200px, thumbnails 600px, profile photos 800 × 800.
- Resizing down is safe; resizing up cannot invent detail and will look soft.
Frequently asked questions
What does aspect ratio mean?
The proportion between width and height. Keeping it locked means the image scales evenly and never looks stretched or squeezed.
Resize or compress — what is the difference?
Resize changes pixel dimensions; compress changes file size (KB) at the same dimensions. Forms with pixel rules need resize; forms with KB limits need compress — sometimes both.
Can I resize a PNG with transparency?
Yes — transparency is preserved when the output stays PNG.