Online pixel ruler

Step 1: Capture screen or window by pressing PrtScn or Alt+PrtScn

Step 2: Paste in this page by pressing Ctrl+V

Step 3: Click on 2 pixels to get length

Step 1: Capture screen or window by pressing ⌘ Command+⇧ Shift+3 or ⌘ Command+⇧ Shift+4

Step 2: Paste in this page by pressing ⌘ Command+V

Step 3: Click on 2 pixels to get length

Step 1: Capture screen by pressing Home +Hold / Power buttons

Step 2: Paste in this page by long tap and pressing Paste button.

Step 3: Click on 2 pixels to get length

Step 1: Capture screen by pressing Volume up + Power buttons

Step 2: Paste in this page by pressing Paste button.

Step 3: Click on 2 pixels to get length

image size

Need to measure distance on the screen? This online free pixel ruler tool will help you to measure the horizontal, vertical and even diagonal distance / length. Try it out now!

The best thing about this online ruler is the fact that you don't have to download it!

How to use online pixel ruler

You can find this tool useful when you have to upload a picture that's a specific measurement, such as a blog banner, or profile photo.

You can drag the ruler to any position on the screen, to line up the zero mark with the left edge of the object that you want to measure.

Then, point to the ruler where it lines up with the right edge of the object, to see the width in pixels.

What is pixel

A pixel is a unit of length that appears to be very roughly the same size on most devices. Typically, it's roughly 1/100th of an inch. It has nothing to do with the glowing dots on your screen, unless you happen to have an older computer that has very large dots on its screen.

To understand exactly what a pixel actually is, one needs to understand what happens when a computer renders a screen, because during that process, different kinds of pixels are involved:

  • Logical pixels
  • Rendered pixels
  • Physical pixels

Shortly: Logical pixels, set as component properties, are a unit of length roughly similar in size on different devices, and not an actual colored dot. Logical pixels are first translated into rendered pixels, and then scaled to actual device pixels, which then may be actual pixels with three different sub-pixels. In reality, this level of fine-grained detail is only provided for informational purposes: All you need to know is that what we call "a pixel" is actually not a physical pixel on a screen. Instead, it's a unit of length that is roughly the same size across different devices.


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