A form asking for an image “at least 600 by 600 pixels” or “no larger than 2000 pixels wide” is a common but genuinely confusing requirement if you are not sure how to actually check what your photo's pixel dimensions currently are. The good news is every device has a built-in way to check this, without needing any special tool.
Checking on a phone
- iPhone: open the photo in the Photos app, tap the “i” information icon (or swipe up on some versions), and the pixel dimensions are shown in the details panel.
- Android: open the photo, tap the details or info icon (often three dots, then “Details” or “File info”), which shows the resolution.
Checking on a computer
- Windows: right-click the image file, choose Properties, then the Details tab, where dimensions are listed.
- Mac: right-click (or Control-click) the file, choose Get Info, and the dimensions appear under “More Info.”
Checking directly in a browser without downloading anything extra
If the image is already open in a browser tab, some browsers show dimensions on hover or in the page's developer tools, though this varies by browser and is less consistent than checking through your device's own file properties. The device-level check above is more reliable across the board.
What to do once you know the current dimensions
If your image is already larger than required in both width and height, you can either upload it as-is (many forms accept anything at or above a stated minimum) or resize it down to the exact requirement using the Image Compressor, following the approach in our guide to resizing an image to exact pixel dimensions. If it is smaller than required, resizing up will not add genuine detail, so check whether a larger source photo is available before settling for an enlarged, softer version.
Understanding a minimum versus a maximum requirement
A stated minimum (“at least 600×600”) means your image needs to be that size or larger in both dimensions; a stated maximum (“no larger than 2000 pixels wide”) means the opposite. Some forms state both, giving you an acceptable range. Read the requirement carefully to confirm which kind you are dealing with before deciding whether to resize up, down, or leave the image as it is.
Why width and height both matter, not just one
A requirement like “at least 600 by 600 pixels” means both dimensions need to meet that minimum, not just one of them — a photo that is 1200 pixels wide but only 400 pixels tall does not meet a 600×600 minimum, even though its width comfortably exceeds it. Check both numbers against the requirement, not just whichever one is more convenient to glance at.
Checking dimensions for several images at once
If you need to check many images quickly, most file managers let you switch to a “details” or “list” view that shows dimensions as a column alongside file name and size, letting you scan several images' dimensions at once rather than opening each one's properties individually. This is worth setting up if you are regularly checking dimensions across a batch of photos.
What if the dimensions shown seem inconsistent with what you expected
Occasionally a photo's dimensions can look unexpected because of how a phone or app has processed it — a photo edited or exported through a particular app can sometimes end up at a different resolution than the original capture. If a dimension check gives a surprising result, it is worth checking the original, unedited version of the photo if one is available, rather than assuming the file property check itself is wrong.
Why this small habit prevents a common, avoidable rejection
A surprising number of form rejections come down to nothing more than an image that was never actually checked against the stated requirement before uploading — not because meeting the requirement was hard, but because the dimensions were simply assumed rather than confirmed. Building this thirty-second check into your routine before any upload with a stated size requirement removes one of the most common, entirely avoidable causes of a rejected submission.
Frequently asked questions
Does checking dimensions require installing anything?
No, every phone and computer has a built-in way to check this through its own file properties or photo details panel.
What is the difference between pixel dimensions and file size in KB or MB?
Pixel dimensions describe how many pixels wide and tall the image is; file size describes how much storage space it takes up. The two are related but not the same, and a form may specify either or both.
Can I resize an image to meet a minimum if mine is currently too small?
You can resize up, but this does not add real detail; if possible, find or retake a larger original rather than relying on an enlarged, softer version.
Do screenshots have different typical dimensions than photos?
Yes, a screenshot's dimensions match your screen or app window's resolution at the time it was taken, which is often different from a camera photo's dimensions.
Is there a quick way to check dimensions without opening the full properties panel?
Some file managers show dimensions as a tooltip on hover; otherwise, the properties or info panel is the most reliable universal method.
Does converting an image to a different format change its pixel dimensions?
No, converting formats (JPG to PNG, for instance) does not change the pixel dimensions unless you specifically resize as part of the conversion.
Is the tool free and private?
Yes. No sign-up, no watermark, and files are removed from the server automatically about an hour after processing.