Count total pixels and display image dimensions, aspect ratio, and file details.
Drop an image onto the page and this tool reads the pixel dimensions stored in the file, multiplies width by height to get the total pixel count, reduces the ratio to its simplest form, and reports format and file size. Everything happens locally in the browser, so the image never leaves your machine. The thing people most often get wrong: total pixels is a pure function of the dimensions, not of the file. A tightly compressed JPEG and a bulky TIFF can hold exactly the same 2,073,600 pixels; the count tells you nothing about quality, sharpness, or how much disk space the file occupies.
A concrete input and expected output from the current implementation.
Input
A 1920 x 1080 PNG file, dragged onto the page.
Expected output
Total pixels: 2,073,600. Dimensions: 1920 x 1080 px. Aspect ratio: 16:9. Format: PNG.
1920 x 1080 = 2,073,600, and dividing both dimensions by their greatest common divisor (120) gives 16:9, the standard full-HD ratio. The file size shown for the PNG is read from the file itself, since disk size cannot be derived from dimensions alone.
Raster formats such as PNG, JPEG, and GIF store width and height as integer fields in the file header. The tool parses those values and multiplies them, so the count is exact: a 1920 x 1080 image is always 2,073,600 pixels no matter how it was compressed. Decoding runs in the browser, and the file is never uploaded.
The aspect ratio is the width and height reduced by their greatest common divisor (1920:1080 becomes 16:9), which is why it is always shown as integers rather than a decimal. Format and file size are reported from the file itself, while the pixel count reflects stored dimensions, not physical print size or DPI.
Partially. Total pixels sets the largest clean print size: 1920 x 1080 pixels prints about 6.4 x 3.6 inches at 300 DPI (divide each dimension by 300), or 12.8 x 7.2 inches at 150 DPI. The count itself says nothing about sharpness, noise, or compression artifacts, so treat it as a resolution gate, not a quality verdict.
No. Total pixels depends only on the stored width and height, which stay the same when you re-encode a file: converting a PNG to JPEG keeps 1920 x 1080 at 2,073,600 pixels. Recompression changes file size, color handling, and quality, but not the count. Only cropping or resampling (resizing) changes it.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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