Resizing a photo means changing its width and height

When you resize a photo, you are making it larger or smaller while keeping the same image. The photo stays the same — only the dimensions change. You might resize to fit a space on a website, to email something that is too large, or to print at a specific size.

Every device has built-in tools that do this without buying anything. On Windows, you use Photos or Paint. On Mac, you use Preview. On iPhone or Android, the default camera app or Google Photos both have resize options. The steps differ slightly between them, but the concept is the same: you tell the tool what size you want, and it shrinks or enlarges the image to match.

Resizing is different from cropping. Cropping cuts away the edges and keeps only the part you want. Resizing keeps the whole image but makes it fit a different space. Many tools do both at once, which can be confusing — this guide covers resizing first, then cropping separately.

Key Takeaways

  • Windows Photos, Mac Preview, and Google Photos all resize images without needing extra software or payment.
  • You can resize by percentage (make it 50% of the original size) or by exact dimensions in pixels or inches.
  • Resizing down (making smaller) always works cleanly; resizing up (making larger) can make the image look blurry.
  • Cropping removes the edges of a photo; resizing shrinks or enlarges the whole photo while keeping all of it.
  • After you resize, save it as a new file so you keep the original unchanged.

Resizing on Windows using the Photos app

Open the photo in the Photos app (it comes with Windows). Right-click the image and select Edit. At the top, you will see a crop icon that looks like two overlapping corners. Click the dropdown arrow next to it and choose Resize.

A panel appears on the right side showing the current size in pixels. You can type in a new width, and the height will adjust automatically to keep the photo from looking stretched. If you want a specific size — say, 800 pixels wide — type that number and the app calculates the height. Click explore when you are done.

To save the resized version, go to File and choose Save as. Give it a new name so you keep the original. The app will save it as a JPG or PNG depending on what you choose.

Resizing on Mac using Preview

Open the photo in Preview (it opens by default when you double-click an image). Go to Tools in the menu bar and select Adjust Size. A window appears showing the current width and height in pixels.

You will see a chain link icon between the width and height fields. If it is linked (connected), changing one number automatically adjusts the other so the photo does not look stretched. Type your new width or height, and the other updates. You can also change the unit from pixels to inches if you are printing — just click the dropdown that says "pixels."

Click OK when the size is correct. Then go to File and Export As to save it with a new name, keeping your original file unchanged.

Resizing on iPhone or Android using Google Photos

Open Google Photos and select the image you want to resize. Tap the three dots at the top right and choose Edit. You will see a crop tool appear — swipe left through the icons at the bottom until you find one that looks like a rectangle with arrows. This is the resize tool.

On iPhone, pinch the image to make it smaller or larger. On Android, drag the corners inward to shrink it or outward to enlarge it. The app shows you the new dimensions as you adjust. When it looks right, tap Save at the bottom. Google Photos saves it as a copy, so your original stays the same.

If you need exact dimensions (like 1200 pixels wide for a website), Google Photos does not show a number field — it only lets you resize by dragging. For precise sizes on a phone, use a free app like Pixlr or Snapseed, which both have number fields where you can type exact dimensions.

Understanding pixels, inches, and file size

A photo's size can be measured two ways: pixels (for screens) and inches (for printing). A pixel is one dot of color. A photo that is 1920 pixels wide looks large on a computer screen but is only about 6.4 inches wide when printed at normal quality.

When you resize, the tool usually keeps the aspect ratio — the relationship between width and height. If your photo is wider than it is tall, resizing keeps it wider than tall. Some tools have a chain link icon you can click to unlink the width and height, which lets you stretch or squash the image, but this usually makes it look wrong.

File size (measured in megabytes or MB) gets smaller when you resize down. A 5 MB photo shrunk to half its width becomes roughly 1.25 MB, which matters if you are emailing or uploading. Resizing up does not add detail — it just makes the same amount of information spread across more space, which can make the image look blurry.

Cropping to remove unwanted edges

Cropping cuts away parts of the photo you do not want. Open your image in Photos (Windows), Preview (Mac), or Google Photos (phone). Look for a crop icon — it usually looks like two overlapping corners or a rectangle with handles on the edges.

Click or tap the crop tool. A frame appears over the photo with handles at the corners and sides. Drag the handles inward to remove the parts you do not want. You can also drag the whole frame to move it around the image. When the frame shows only what you want to keep, click explore or Done.

Some tools let you choose a crop ratio before you start — like 4:3 (standard photo shape) or 16:9 (widescreen). This locks the frame to that shape so you cannot accidentally make it too wide or too tall. If you do not see this option, you can crop freely and the tool will keep whatever shape you create.

Resizing for specific uses

Different places need different sizes. A profile photo for a website is usually 200 to 400 pixels square. A photo for email should be no wider than 1200 pixels so it does not take forever to send. A photo for printing at 4x6 inches needs to be at least 1200 x 1800 pixels at normal print quality.

If you are uploading to a website and do not know what size it needs, start by making the photo no wider than 1200 pixels. This works for most websites and keeps the file small. If the website looks blurry, you can always resize it larger and try again.

For social media, each platform has its own preferred sizes. Instagram profile photos are 110 x 110 pixels. Facebook cover photos are 820 x 312 pixels. Rather than memorizing these, most social platforms will tell you if your photo is too small or the wrong shape when you try to upload it — you can then resize and try again.

Frequently Asked Questions

Can I make a small photo larger without it looking blurry?

Not really. Resizing up spreads the same pixels across more space, which makes the image look soft or pixelated. If you have a small photo and need it larger, your best option is to find a higher-resolution version of the original. If that is not possible, accept that it will look slightly blurry.

What is the difference between saving and exporting?

On Mac, Save overwrites your original file, while Export As creates a new file and leaves the original alone. On Windows, Save as always creates a new file. Always use Export As or Save as when resizing so you keep a copy of the original.

Why does my resized photo look stretched or squashed?

You probably unlinked the width and height, or the tool did not keep the aspect ratio. Look for a chain link icon between the width and height fields — if it is broken, click it to reconnect them. This forces the tool to keep the photo's original proportions.

How do I know what size to make a photo for printing?

Multiply the print size by 300. A 4x6 inch print needs to be 1200 x 1800 pixels. An 8x10 inch print needs 2400 x 3000 pixels. If your photo is smaller than this, it will look blurry when printed. Your printer or photo service will tell you the minimum size when you order.

Can I resize multiple photos at once?

Windows Photos and Google Photos both have batch editing, but it is limited. On Windows, select multiple photos in the Photos app, then right-click and choose Edit — you can explore the same resize to all of them at once. On Mac, Preview does not batch resize, so you have to do them one at a time. For many photos, a free tool like ImageMagick (command line) or Bulk Image Resizer (Windows) is faster.