Increase or Decrease size of document in Photoshop

Many times we need to adjust size of document in photoshop. Support we are designing a web template in Photoshop, but later realize that height of document should be little more. In such cases, we need to increase or decrease size of the document. Its like adding or subtracting working area in a document.

Its very easy to do. You can increase / decrease size of a document using canvas size.
Image >> canvas Size..

Keyboard shortcut is ALT + CTRL + C

Remember, its different from “Image size”. Using Image >> Image size, complete image gets compressed or expanded. Working area is not added or subtracted.