A form says “at least 600 px wide”, you want product images the same size, or you need to shrink a folder of photos. This guide covers what pixel dimensions mean, how to resize without distorting images, and how to resize many images at once on a computer or phone.
Use Resize ImagesFree, no sign-up. Your files stay on your device.
“Image size” can mean two things, so check which one you’ve been asked for.
Changing width and height by different amounts stretches the image, and faces and text look distorted. Keep the aspect ratio when resizing.
If a rule fixes both width and height (say 600 × 800) and your photo has a different ratio, you can’t hit both exactly without distortion. Crop the photo to the right shape first; for ID photo sizes, ID Photo Maker does this.
| Method | Devices | Batch | Best for |
|---|---|---|---|
| Windows Photos app | Windows 11 | One at a time | Quickly shrinking one photo |
| Windows Paint | Windows | One at a time | Exact pixels or percentages |
| Mac Preview | Mac | Yes | Resizing several images on a Mac |
| iPhone Shortcuts | iPhone | Yes (needs setup) | A fixed size on an iPhone |
| This site’s Resize Images | Any device (browser) | Yes | Longest side, width and height, or percentage, for many images on any device |
In the Windows 11 Photos app, open the photo and choose “Resize image” from the “…” menu to set width and height in pixels and the quality.
In Paint, use Resize on the Home tab, choose percentage or pixels, tick “Maintain aspect ratio” and enter the size.
Open all the images in Preview, select them all in the sidebar, then choose Tools → Adjust Size. Enter a width or height with “Scale proportionally” ticked, and every image is resized the same way.
This site’s Resize Images resizes many images at once on Windows, Mac, iPhone or Android, including iPhone HEIC photos. Your images are never uploaded.
When portrait and landscape photos are mixed, “Longest side in pixels” gives every photo the same long side, which keeps sizes consistent. Resized images don’t keep Exif data such as location.
Enlarging an image stretches it by filling in pixels, so it looks blurry. For rules like “at least 600 px wide”, check the original is at least that big, and scale down from the original photo where you can.
A. Yes. Windows Photos and Paint, Mac Preview and this site’s Resize Images are all free.
A. Yes. Resize Images applies the same settings to many images and downloads them as a ZIP. Mac Preview can also batch resize.
A. Choose “Longest side in pixels” or “Percentage”, or tick “Keep aspect ratio” when setting width and height.
A. If your photo isn’t already 3:4, crop it to that shape first, then resize. For official ID photo sizes, ID Photo Maker crops for you.
A. Pixels are the image’s width and height; KB is the file size. To reduce the file size, use Compress Images.
A. Yes. Resize Images accepts HEIC photos directly.