Samuel Wood (Otto)

Normally when you upload an image to a WordPress site, it creates several differently sized versions of the image automatically. Themes can define custom image sizes as well, increasing the amount of images generated on your server.
This plugin changes the way WordPress creates images to make it generate the images only when they are actually used somewhere, on the fly. Images created thusly will be saved in the normal upload directories, for later fast sending by the webserver. The result is that space is saved (since images are only created when needed), and uploading images is much faster (since it’s not generating the images on upload anymore).
“Pretty” permalinks must be enabled for this plugin to function.
Note: This plugin does not work on multisite setups, due to the way WordPress handles file serving in such situations (with ms-files.php).
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Dynamic Image Resizer

Make your images change sizes dynamically.

Brad Parbs

wpTextResize is an easy to use way to have Increase, Decrease, reset font size controls for body text on a WordPress site.
Just use the [wpResize] shortcode wherever you want the controls to show up. Or use the widget to place it in a sidebar.
Theme creators: You can also add wpTextResizeControls(0) to your template for the controls to be automatically styled, or wpTextResizeControls(1) to manually style. When manually styling, wpTextResizeControls is the container, and increaseFont, resetFont, and decreaseFont are all anchors you can target.
Go wild!

wpTextResize

wpTextResize is an easy to use way to have Increase, Decrease, reset font size controls for body text on a WordPress site.

Dynamic Image Resizer vs wpTextResize