WEBP Size Finder

Upload forms, content management systems and advertising platforms all ask the same questions before they accept an image, and they tend to ask them in different units. One wants a maximum file weight in kilobytes, another demands an exact pixel width, a third cares about aspect ratio because it crops to a fixed shape. Guessing at any of these costs a round trip: the upload fails, you resize, you try again, and the page you were building waits. Reading the numbers first turns three attempts into one.

This tool answers all of those questions at once from the file itself. Pixel dimensions and file weight are read directly, and the aspect ratio is reduced to its simplest terms rather than left as raw figures, so a 1920 by 1080 image is reported as 16:9. That single value is often the one that decides whether a photo fits a social card, a story slot or a wide banner without being cropped into something you did not intend. Files are measured as they are, with no re-encoding and no resampling, so the figures describe the image you actually have.

Weight is reported in the unit you would naturally quote, switching from kilobytes to megabytes as the file grows, and a running summary across the whole batch adds up both the total megapixel count and the combined file weight. That summary is what makes the tool useful for page budgets rather than single files: if a batch of twenty WEBP images comes to 4.6MB, you know immediately whether the collection fits the weight you allowed for the page, and whether one oversized file is responsible.

Print introduces a measurement most image tools ignore. The Show print size option is on by default and converts pixels into physical inches, but it can only do so when the file states how densely its pixels are packed. That density is parsed out of the raw bytes, from the pHYs chunk inside PNG files and from the JFIF density field inside JPEG files, with no external library involved. Where a file carries no density at all, which includes WEBP, the print row is simply not shown rather than filled with a made up default, because a wrong inches figure is worse than no figure.

Deciding whether a size is right usually means comparing it against something, so the standard size matcher lines your image up against fifteen common targets and reports the closest one. The social group covers square, portrait and story formats alongside feed, post, share and thumbnail sizes. The display group covers HD, Full HD, 4K and square. The print group covers A4 at screen and print density plus two common photo sizes. Matching takes ratio into account as well as raw dimensions, so the suggestion is the nearest genuine target rather than merely the closest width.

Everything stays on your own machine. The files are read in the browser and nothing is uploaded, so measuring a batch of unpublished product photography costs no bandwidth and exposes nothing. When the numbers need to leave the browser, Export Report writes a CSV containing every figure for every image, which drops straight into a spreadsheet for auditing a media library or handing a list of dimensions to a designer.