Wordle is an online toy for generating word clouds using the text you provide. Text can be submitted by providing an URL or by pasting raw text into an input. The most frequent words from the text are then used as the source for the resulting visualization, where frequency is used to determine the size of each word.
You may customize the output by choosing from a variety of display options (layout, font, colours) or use the randomize feature to get a random visualization. Additionally, there is built-in stop word support for many common languages, and the option to change the word case.