Tool
Image Resolution Checker
Upload an image to see its pixel dimensions, a real compression-quality estimate, and a quick read on whether it's usable for web, social media, or common print sizes. Nothing is uploaded -- it all runs in your browser.
Drop an image here, or click to choose one
JPG, PNG, WEBP · stays on your device
Upload an image to see its resolution, compression quality, and where it can be used.
Resolution and quality are two different things
It's easy to assume a high-megapixel photo is automatically a good file, but pixel count only measures one dimension of quality. A large image can still be heavily compressed, throwing away fine detail in blocky JPEG artifacts that no amount of extra pixels can fix.
This tool checks both independently: how many pixels the image actually has, and -- for JPEGs -- how much compression was applied when the file was saved, read directly from data stored inside the file itself.
FAQs
How is the quality score calculated?
It's a weighted average of two things: a resolution score based on megapixels relative to a 12MP reference point, and a compression score based on either a real JPEG quality estimate or a lossless bonus for formats like PNG. The exact weighting is 60% resolution and 40% compression, both shown separately so you can see what's driving the number.
How can you tell JPEG compression quality just from the file?
Every JPEG stores a quantization table that records how aggressively it compressed the image. This tool reads that table directly out of the file and compares it against the standard baseline table, which gives a genuine estimate of the save quality -- not a guess based on file size alone.
Why does a high-resolution image sometimes score lower than a smaller one?
Pixel count and compression quality are independent. A 20-megapixel photo saved at low JPEG quality can have more visible artifacts than a well-preserved 8-megapixel one, because heavy compression throws away detail regardless of how many pixels the file started with.
My image passes for 4×6 but fails for 8×10. What does that mean?
It means the pixel count is enough to hit 300 DPI at the smaller size but not the larger one -- printing at 8x10 would drop the effective resolution below a sharp threshold. Either print smaller, or source a higher-resolution original if the larger size matters.