- Width and height in pixels, as the browser decodes the image (phone photos are reported the way they display, after any orientation tag is applied).
- File size in bytes, KB or MB, using 1 KB = 1024 bytes and two decimal places.
- Aspect ratio reduced to its simplest whole-number form: 4032 x 3024 becomes 4:3 and 1920 x 1080 becomes 16:9. Dimensions that do not share a common factor stay as they are, so 1001 x 667 is shown as 1001:667.
- Format as reported by your browser, such as jpeg, png or webp.
- Resolution category, a rough label based on width only: 3840 px and up is shown as 4K, 1920 px as Full HD, 1280 px as HD, anything narrower as standard definition. It describes width, not sharpness.
What the checker reports
Pixels and kilobytes are different measurements
Upload forms often state two limits, and they are easy to confuse. Dimensions (pixels) describe how big the picture is. File size (KB or MB) describes how much storage it takes. Two images with the same dimensions can differ hugely in file size depending on format, quality and content: a plain logo compresses far better than a detailed photo.
- Too many pixels? Use the Image Resizer.
- Too many kilobytes? Use Reduce Image Size, which lets you type the limit.
- Wrong shape? Use the Crop tool with the required ratio.
What it does not tell you
The checker does not read DPI, camera details or GPS data. For those, open the file in the Image Metadata Viewer, and to see or change print resolution use the DPI Converter. Accepted formats are JPG, PNG, WebP and AVIF (AVIF needs a browser that can display it).
Where the processing happens
The browser reads the file locally to measure it. The image is not uploaded or modified.
Questions about this tool
Why does Windows show a different size in MB?
Some software uses 1 MB = 1,000,000 bytes and some uses 1,048,576. This tool uses 1024-based units, which match what Windows File Explorer shows.
A form says my photo must be under 100 KB and 600 x 600 pixels. How do I check mine?
Open the photo here. You see its width and height in pixels and its file size in KB straight away, so you can compare both with what the form asks for. Nothing about the file is changed.
My photo has the right pixel size but is still too big in KB. What do I do?
Pixel size and file size are different things. Keep the dimensions and lower the file size with Reduce Image Size, where you type the KB limit.
The checker says 4K. Does that mean my photo is sharp?
No. The label only describes the width in pixels. A wide photo can still be blurry if it was out of focus or heavily compressed.
Can this show the DPI of my image?
No. Use the DPI Converter to see and change print resolution.