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.