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Window resizeBy() Method

❮ Window Object


Open a new window, and resize the width and height 250px relative to its current position:

function openWin() {
  myWindow = window.open("", "", "width=100, height=100");  // Opens a new window

function resizeWin() {
  myWindow.resizeBy(250, 250);                             // Resizes the new window
  myWindow.focus();                                        // Sets focus to the new window
Try it Yourself »

More "Try it Yourself" examples below.

Definition and Usage

The resizeBy() method resizes a window by the specified amount, relative to its current size.

Note: This method moves the bottom right corner of the window by the specified number of pixels defined. The top left corner will not be moved (it stays in its original coordinates).

Related methods:

  • resizeTo() - Resizes the window to the specified width and height
  • moveBy() - Moves a window relative to its current position
  • moveTo() - Moves a window to the specified position

Browser Support

resizeBy() Yes Yes Yes Yes Yes


resizeBy(width, height)

Parameter Values

Parameter Type Description
width Number Required. A positive or a negative number that specifies how many pixels to resize the width by
height Number Required. A positive or a negative number that specifies how many pixels to resize the height by

Technical Details

Return Value: No return value

More Examples


Open a new window, and decrease the width by 50px and increase the height by 50px:

myWindow.resizeBy(-50, 50);
Try it Yourself »


Using the resizeBy() method together with resizeTo():

function resizeWinTo() {
  myWindow.resizeTo(800, 600);

function resizeWinBy() {
  myWindow.resizeBy(-100, -50);
Try it Yourself »


Resize the topmost browser window with 100px each way (works only in IE and Safari):

top.resizeBy(100, 100);
Try it Yourself »

❮ Window Object