Check Image Dimensions
Check width, height, aspect ratio, file size and megapixels.
What does Image Dimension Checker do?
Drop in one or more images to see their exact pixel dimensions, aspect ratio in simplest form, megapixel count, file size and format. Useful for checking assets against a design spec or an upload limit.
How to Use Image Dimension Checker
- 1Add imagesDrop in as many as you like at once.
- 2Read the tableDimensions, ratio, megapixels and size appear per file.
- 3CompareSort by any column to find the odd one out.
Key Features
- Exact pixel width and height
- Aspect ratio reduced to its simplest form, plus the decimal ratio
- Megapixel count and file size
- Detected format and colour type
- Several images compared in one table
- Print size estimate at 300 and 72 DPI
Frequently Asked Questions
How do I find an image’s dimensions?
Drop it here and read the width and height. The browser decodes the header, so the answer is exact and appears instantly, even for very large files.
What does the aspect ratio mean?
The proportion of width to height, reduced by the greatest common divisor. A 1920 × 1080 image is 16:9; a 1200 × 1200 image is 1:1. Matching the ratio your platform expects avoids awkward automatic cropping.
What is a megapixel?
One million pixels — width × height ÷ 1,000,000. A 4000 × 3000 photo is 12 megapixels. It is a useful shorthand for how much detail an image holds and how much memory it needs.
How does DPI relate to pixel dimensions?
DPI only matters for print. Dividing pixel dimensions by 300 gives the size in inches at typical print quality, so a 3000 × 2000 image prints well at 10 × 6.7 inches. On screen, DPI is ignored entirely.
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Your image is read straight from your device by the browser and processed on a canvas in this page. It is never uploaded, stored or sent anywhere — you can disconnect from the internet after the page loads and the tool still works.
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