When do you need to resize an image?
Many websites and forms ask for pictures of a specific size. A job portal may want a 200 × 200 pixel profile photo, a government form may need a 350 × 450 pixel passport photo, and social media platforms recommend sizes such as 1080 × 1080 for square posts. This tool changes the pixel dimensions of your picture so it fits exactly.
How to resize a picture
- Choose an image from your device. The original width and height appear below the inputs.
- Type the new width. With Keep aspect ratio ticked, the height is calculated for you so the picture is not stretched.
- Or type a percentage, for example 50 to make it half the size.
- Choose PNG, JPG or WebP and click Resize & download.
Understanding aspect ratio
Aspect ratio is the relationship between width and height. A 4000 × 3000 photo has a 4:3 ratio. If you resize it to a width of 800 and keep the ratio, the new height is:
new height = new width × (original height ÷ original width) = 800 × (3000 ÷ 4000) = 600
If you untick the option and enter a width and height with a different ratio, the image will be squeezed or stretched. To change the shape without distortion, crop the picture first.
Making images bigger
You can enlarge an image, but a resizer cannot add detail that was never captured. Doubling the size of a small picture makes it look softer. For the best result, start from the largest original you have and only make it smaller.
Frequently asked questions
Which format should I save as?
Use JPG for photos, PNG for logos, screenshots and images with transparency, and WebP when you want the smallest file for a website.
Will resizing reduce the file size?
Yes. Fewer pixels means less data, so a picture resized to half its width is usually about a quarter of the file size.
Is there a limit on image size?
Your browser's memory is the only limit. Very large pictures of more than 50 megapixels may be slow on older phones.