Understanding image technical data
Image metadata helps you make better publishing decisions. Dimensions tell you whether a file is too large for a layout, file size tells you how much bandwidth it will consume, and format tells you which browsers and email clients can display it. A brightness histogram shows whether an image is underexposed, overexposed, or well balanced.
What the fields mean
- MIME type identifies the file format used by browsers and servers.
- Dimensions describe the pixel width and height of the decoded image.
- Aspect ratio compares width to height, such as 16:9 or 4:3.
- Megapixels are the total number of pixels in the image and are often used to estimate resolution requirements.
- File size reflects how much data the browser must download.
- Histogram maps the distribution of brightness from black to white.
Using the histogram for better photos
A histogram that is clipped on the left means shadows are very dark, while clipping on the right means highlights are blown out. A broad, balanced histogram usually indicates a photo with good tonal range. For web content, a slightly bright histogram often looks better on small screens with less contrast.
Frequently asked questions
Does the viewer read EXIF data?
No. This tool shows file-level information and pixel statistics only. It intentionally does not read camera, location, or device metadata.
Why does the MIME type differ from the file extension?
The file extension is just a label. The viewer reads the file signature, which is more reliable for detecting the actual format.
What is a good megapixel count for web images?
Most web layouts only need 1-3 megapixels. A 1200 x 800 image is about 0.96 megapixels, which is enough for a wide blog image.
Related tools
After reviewing the details, use the compressor to reduce file size, the resizer to match layout dimensions, or the converter to switch to a more efficient format.