Free tool
Change Text Case Online
Convert text between upper, lower, title and sentence case, or into the naming styles programmers use. Pick a style and the result updates as you type.
Everything runs inside your browser. Nothing you paste is uploaded or stored.
How to use it
Doing this more than once? Do it on your Mac.
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This page handles one paste at a time. Text Workflow runs 45+ text actions on your Mac, chains them into workflows you save once and reuse, and applies them to whole folders of files. Everything happens on-device, and it syncs to your iPhone.
Questions
What is the difference between title case and sentence case?
Title case capitalises the significant words in a line, the way a headline does. Sentence case capitalises only the first letter of each sentence and leaves the rest lowercase.
Why do small words stay lowercase?
Most style guides keep short joining words like "of", "and" and "the" lowercase inside a title unless they start or end it. Untick the option if you want every word capitalised.
What are camelCase and snake_case for?
They're naming conventions in programming. camelCase joins words with each later word capitalised, and snake_case joins them with underscores. Both are useful for turning a label into a variable or column name.
Does it work on many lines at once?
Yes. Each line is converted separately, so you can paste a whole list. To apply the same conversion to files on your Mac, or chain it with other steps, use Text Workflow.