Tool Review: Sizer

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Last Updated on: November 3, 2026

This will be my first tool review as part of Jane Hart’s 10 Tool Challenge. This tool is called Sizer.

Sizer resizes a computer window to the dimensions you specify. This is important if you are doing screencasts or screen captures, and you want all windows to be the same size.

Yesterday, I wrote about setting your screen for 16:9 dimensions. 16:9 is the aspect ratio that YouTube prefers.

You can download Sizer, a Windows program, from http://www.brianapps.net/sizer/. Once you install the program and run it, it will sit in your toolbar.

Sizer in toolbar

Sizer in toolbar

Configure Sizer

If you have specific screen sizes you wish to use, you will want to configure those dimensions into Sizer before using it. Adding dimensions is pretty straightforward. Here are the steps.

  1. Right-click on the Sizer icon in the toolbar.

  2. Select Configure Sizer…

Configure Sizer

Configure Sizer

  1. Click on the Add button, select the new configuration, and edit its parameters.
Sizer Configuration Window

Sizer Configuration Window

In this example, I will set the window to 200×300.

Sizer Configuration Window

Sizer Configuration Window

You have several options to set, and the Sizer User Guide can better explain these settings.

  1. After you add a new configuration, close the window by selecting the OK button.

You are now ready to use Sizer. If you want to set a screen size for screencasting, you will want to create a dimension for 960×540.

Using Sizer

Sizer is easy to use. First, it must be running. An icon can verify this in the toolbar. Here are the steps:

  1. Open a program, and right-click on the lower-right corner of the program when the cursor changes to a double arrow. Basically, you are in a position to resize your window manually.
Resizing a window

Resizing a window

  1. Select your desired dimensions.
Select Sizer Dimensions

Select Sizer Dimensions

The window will now resize to the dimensions that you have chosen, and you can begin your screencast or image capture. Important note: the program itself must allow for the specific dimensions. In the example above, the program Skitch will not allow for resizing to 200×300.

If you are looking for consistency, this is a useful program to add to your arsenal. Does anyone know about a good resizing tool for Macs?

This tool will do wonders for my screencasting in the future. I hope it is useful for you.

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