Check image dimensions online
Find the exact pixel dimensions of an image — useful before an upload form asks for a specific size, or when a file simply does not say. Add your images and download a small report for each.
This reads the dimensions the browser actually decodes, not whatever a file name or a folder view claims. Those can be wrong or missing; the decoded pixels cannot.
Your images never leave your device. Reading them runs entirely in your browser, so nothing is uploaded, stored, or scanned, and a batch costs no more than a single file.
or drop them here — nothing is uploaded
How to image dimension checker
Add your images
Drop JPG, PNG, or WebP files into the box, or click to browse.
Check and download
Press Image Dimension Checker. A small text report downloads for each image, and the result also shows on screen.
Frequently asked questions
Are my images uploaded anywhere?
No. Dimensions are read in your browser using JavaScript, so your files stay on your device. You can confirm this by opening your browser devtools Network tab while working — there are no upload requests.
Why not just check my file manager or photo app?
Most do show this, but not all — some strip it from thumbnail views, and some phone galleries show a cropped preview size rather than the original. This reads the actual decoded pixel dimensions directly, which is the one number that cannot be wrong.
What counts as the "dimensions" of an image?
The width and height in pixels — 4032 × 3024, for example — which is what determines print size at a given resolution and what an upload form actually checks against, regardless of the file size in megabytes.
Does this also tell me the aspect ratio?
The report includes it, but Aspect Ratio Calculator is the dedicated tool if that is specifically what you need, including matching it to a recognisable name like 16:9 or 4:3.
Is there a limit on how many files?
Thirty at a time, which is a limit of your device rather than our policy — everything is held in memory while it works.