Choose Edit > Free transform and drag the blue corner indicators around until the image is about the right size.

You won’t have the same level of control over the specific size, but this is a quick and easy way to resize an image.

You can also use the free transform feature to resize layers. Here, for example, my image will end up in the bottom right hand corner of my newly sized canvas: Also note that you can choose where the image will be anchored when your canvas size changes. Note also that when you change your canvas size, there is no option to constrain proportions because you won’t be changing the image itself but the canvas upon which it rests. You can also rotate your canvas or flip it horizontally or vertically. It’s your working space, and you can make it as large as you like. The canvas is the “Background” layer that every new image opened in Pixlr rests on. You can also alter the size of your canvas. Note: Canvas size is different than image size Not using constrain proportions means your image may look “stretched” after resizing. In this option, you increase the height or length and Pixlr will compute the rest. If you want your image to have the same proportions after resizing (most likely yes if you are editing photographs you’ve taken) you’ll want to make sure the “constrain proportions” option is checked. With an open image, choose Image > Image Size and alter the image size by entering a desired size or using the built-in sliders. Changing the size of an image in Pixlr Editor is easy.

Pixlr editor online how to add layers