Case Converter

Case Converter guide

Changing capitalisation alters the shape of a draft without rewriting its words. It is useful for headings, labels, lists and pasted text that arrived in the wrong case.

Choosing a format

• Use uppercase for short labels or headings where readability permits.
• Use lowercase for tags, commands, and compact interface text.
• Use title case for many headings.
• Use sentence case for ordinary prose and instructions.

A converter cannot choose the right style for your publisher. If a house style or assignment brief specifies one, follow that instead of this page.

What each mode changes

Each mode rewrites the whole box. There is no per-word undo, so keep the original somewhere else if you may need it.

• UPPERCASE and lowercase are direct: every letter is changed, and nothing else.
• Title Case lowercases the whole string first, then capitalises the first letter of every word. It also capitalises after a hyphen, slash, dash, bracket or opening quote, so well-known becomes Well-Known. It does not keep short articles or prepositions lowercase the way a book-title style guide might.
• Sentence case lowercases the whole string, then capitalises the first letter of the text, the first letter after a full stop, question mark or ellipsis, and the first letter of each new line.

Tidy spacing collapses repeated spaces and tabs. Trim line ends removes leading and trailing spaces from each line. Both are on by default and can be turned off before formatting.

Read this before you use it on anything technical

Because Title Case and Sentence case lowercase the text before re-capitalising it, acronyms and brand names lose their deliberate capitals. NASA becomes Nasa, PDF becomes Pdf, iPhone becomes Iphone, and JavaScript becomes Javascript.

The same applies to camelCase, snake_case, file paths, environment variables and any identifier. Convert prose, and leave code and identifiers alone.

Sentence case also treats any full stop as a sentence break. In see fig. 4 for detail it produces See Fig. 4 For Detail. That is correct for a sentence and wrong for a figure reference, and the tool has no way to tell the difference.

Privacy, speed and cancellation

Nothing is uploaded. The conversion runs in a Web Worker inside this browser tab, and the text is never sent over the network.

The worker processes the text in chunks, reports progress as each chunk finishes, and can be cancelled. If the browser cannot start a worker, the same task runs on the main thread in small chunks so the page still responds. A 30-second timeout stops a job that takes longer and says so instead of leaving you waiting.

What this tool does not do

It changes capitalisation and nothing else. It does not fix grammar, punctuation or spelling, it does not know your preferred style guide, and it cannot tell an acronym from a typo. Convert first, then read the result in the place it is going, because that is the only way to catch the cases above.

More on this in the guides

Most useful on an application form, which is covered in getting an internship in the Philippines. See the Student Guide index for the rest.