Image Dimension Checker
Check an image's exact width, height, aspect ratio, and megapixels, right in your browser. Check one image, or switch to Bulk mode to see a table of dimensions across many images at once.
Why aspect ratio matters
Knowing an image's aspect ratio (like 16:9 or 4:3) helps you pick the right crop or resize target so the image fits a specific placement — a social media post, a banner, or a print size — without distortion.
Megapixels vs file size
Megapixels measure resolution (total pixel count), not file size. A high-megapixel image can still have a small file size if compressed heavily, and vice versa — the two are independent.
Bulk mode
Bulk mode reads every selected image and shows a table of width, height, aspect ratio, megapixels, and file size for each one — useful for quickly auditing a whole folder of images at once instead of checking them one by one.
Common Mistakes to Avoid
Confusing megapixels with file size
Solution:
Megapixels describe resolution, not storage size. Use the Image Compressor or Optimizer if your goal is a smaller file, not just checking dimensions.
Assuming aspect ratio from file name or extension
Solution:
File type has no bearing on dimensions or aspect ratio — always check the actual pixel dimensions before assuming a size.
Frequently Asked Questions
It expresses width to height as a simplified ratio, e.g. 16:9 — useful for finding a crop or resize target that matches a specific format.
No — dimensions are read entirely in your browser.
Why aspect ratio matters
Knowing an image's aspect ratio (like 16:9 or 4:3) helps you pick the right crop or resize target so the image fits a specific placement — a social media post, a banner, or a print size — without distortion.
Megapixels vs file size
Megapixels measure resolution (total pixel count), not file size. A high-megapixel image can still have a small file size if compressed heavily, and vice versa — the two are independent.
Bulk mode
Bulk mode reads every selected image and shows a table of width, height, aspect ratio, megapixels, and file size for each one — useful for quickly auditing a whole folder of images at once instead of checking them one by one.