How to find the width and height of any image file

Picture resolution is the width and height of an image measured in pixels. A photo that is 1920 pixels wide by 1080 pixels tall has a resolution of 1920×1080. You need to know this number when you're sizing images for a website, printing a photo, or checking whether a picture is large enough for what you're making.

The fastest way to check resolution depends on what device you're using. On Windows, right-click the image file and select Properties. On Mac, click the image once and press Command+I. On a phone, open the image in your camera roll and look for an info button. Each method takes about 10 seconds and shows you the exact pixel dimensions without opening any editing software.

Key Takeaways

  • Resolution is measured in pixels wide by pixels tall — a 1920×1080 image is 1920 pixels across and 1080 pixels down.
  • On Windows, right-click any image file, choose Properties, and look for the Dimensions field under the Details tab.
  • On Mac, select the image file and press Command+I to open the Info window, where resolution appears near the top.
  • On iPhone and Android, open the image in your camera app or gallery and tap the info icon to see pixel dimensions.
  • Resolution is different from file size — a 5 MB photo might be 800×600 or 4000×3000 depending on how many pixels it contains.

Checking resolution on Windows

Open File Explorer and navigate to the folder where your image is stored. Right-click the image file and select Properties from the menu that appears. A window will open showing several tabs at the top — click the Details tab.

Scroll down in the Details tab until you see a field labeled Image or Dimensions. This field shows the resolution as width × height in pixels. If you see "1920 × 1080", that means the image is 1920 pixels wide and 1080 pixels tall. Close the Properties window when you have the number you need.

If the Details tab does not show image dimensions, your file might be corrupted or in a format Windows does not recognize. Try opening the image in Windows Photos (the built-in photo viewer) instead — right-click the image, select Open with, then choose Photos. Once the image opens, look at the window title bar or the info panel on the right side, which sometimes displays resolution there.

Checking resolution on Mac

Open Finder and navigate to the folder containing your image. Click the image file once to select it, then press Command+I on your keyboard. A window titled "Info" will open when ready.

Look near the top of the Info window for a section labeled Image. Under that section, you will see a line that says Dimensions or Resolution, showing the width and height in pixels. If the image is 3000 × 2000, that means it is 3000 pixels wide and 2000 pixels tall. Close the Info window when you have the information you need.

If you have the image already open in Preview (Mac's built-in image viewer), you can also check resolution through the menu. Click Tools at the top, then select Adjust Size. A window will open showing the current pixel dimensions. This method works even if the file is not in your Finder window.

Checking resolution on iPhone

Open the Photos app and find the image you want to check. Tap the image to open it full-screen, then tap the info icon — it looks like a circle with an "i" inside — usually located in the top right corner or bottom of the screen.

A panel will slide up or appear showing details about the photo. Look for a line that says Image Size, Dimensions, or Resolution. This line shows the pixel width and height. If it says "4032 × 3024", your photo is 4032 pixels wide and 3024 pixels tall. Tap elsewhere to close the info panel.

If you do not see an info button in Photos, try opening the image in a different app. Many third-party photo apps like Snapseed or Adobe Lightroom Mobile show resolution when you open an image and look for an info or details section. The exact location varies by app, but the information is always labeled as dimensions or image size.

Checking resolution on Android

Open your phone's gallery or Photos app and find the image. Tap the image to open it, then look for a menu icon — usually three dots in the top right corner or bottom of the screen. Tap that icon and select Details, Info, or Properties from the menu.

A panel will show information about the photo, including the resolution listed as width × height in pixels. If the panel shows "3264 × 2448", your image is 3264 pixels wide and 2448 pixels tall. Close the panel when you have the number.

If your gallery app does not show resolution in the details panel, try opening the image in Google Photos instead. Google Photos displays resolution at the bottom of the info panel when you tap the info icon. You can also use a file manager app like Files by Google — navigate to the image, long-press it, and select Properties to see dimensions listed there.

Understanding what resolution numbers mean

Resolution tells you how many pixels wide and tall an image is, but it does not tell you how large the image will look when printed or displayed. A 1920×1080 image looks different sizes depending on the screen it is shown on. The same resolution looks larger on a phone screen than on a computer monitor because phone screens are smaller.

For web use, most images between 1200×800 and 2400×1600 work well for websites and social media. For printing, you generally need at least 300 pixels per inch — so a 4×6 inch print needs a resolution of at least 1200×1800. For phone screens, anything above 1080×1920 is usually more than enough. If you are unsure what resolution you need for your specific project, check the requirements of the platform or printer you are using.

Resolution is also different from file size. A photo that is 5 megabytes (MB) could be 800×600 pixels or 4000×3000 pixels depending on how much detail and color information it contains. Checking the actual pixel dimensions tells you whether an image is large enough for what you need to do with it.

What to do if you cannot find the resolution

If the methods above do not show resolution, the file might be in a format your device does not recognize, or the file might be corrupted. Try opening the image in a different app — web browsers like Chrome or Firefox will display most image formats, and you can right-click the image in the browser and select Inspect or View Image Info to see the dimensions.

You can also use free online tools to check resolution. Upload your image to a site like Pixlr, Canva, or Photopea, and open it in the editor — the resolution will display in the image properties or at the bottom of the window. This method works on any device with internet access and handles almost any image format.

If the image file is extremely small (under 50 KB) or will not open in any app, it may be too corrupted to use. In that case, you will need to get a different version of the image or re-read it from wherever you originally found it.

Frequently Asked Questions

Is resolution the same as DPI or PPI?

No. Resolution is the total number of pixels in an image (like 1920×1080). DPI and PPI measure how many pixels fit in one inch, which matters for printing but not for screens. An image can have the same resolution but different DPI depending on how it was created. For screen use, only the pixel resolution matters.

Why does my image look blurry even though the resolution is high?

High resolution does not may provide quality. The image might be blurry because it was photographed out of focus, compressed heavily when saved, or enlarged beyond its original size. Resolution tells you the pixel count, not the sharpness or quality of those pixels.

Can I increase the resolution of an image after I take it?

No, not meaningfully. Enlarging an image in editing software does not add new detail — it just stretches the pixels you already have, making the image look blurry or pixelated. You can only get higher resolution by taking a new photo with a better camera or finding a higher-resolution version of the original image.

What resolution do I need for social media?

Most social media platforms work well with images between 1080×1080 and 1200×1200 pixels. Instagram, Facebook, and Twitter automatically resize images, so anything larger than 2000 pixels wide is usually unnecessary. Check the specific platform's image guidelines if you are uploading for a particular purpose.

Does checking resolution use any of my phone's storage or data?

No. Viewing image properties or resolution information does not read, upload, or modify the file in any way. It only reads information that is already stored with the image, so it uses no extra storage or data.