Case Converter Online – Convert Text to Uppercase, Lowercase & Title Case

A case converter rewrites text in a different capitalisation style, and a word counter tells you how much text you have. This tool does both at once: paste your text, press the style you want, and watch the character, word, sentence and paragraph counts update as you type.

Case conversion is the job of changing how the letters in a piece of text are capitalised without changing the words themselves. The simplest versions — all upper case, all lower case — are pure transformation. The interesting ones are the naming conventions programmers use, where the capitalisation carries meaning.

In camelCase the first word stays lower case and every following word starts with a capital, which makes a name readable without spaces. In snake_case the words are joined by underscores, and in kebab-case by hyphens. CONSTANT_CASE is upper case with underscores, and by long convention it marks a value that will never change.

Sentence case capitalises only the first letter of each sentence, which is what most style guides ask for in body text. Title case capitalises the important words in a heading, and it is where the arguments start: style guides disagree about whether short words like "and", "of" and "the" should be capitalised in the middle of a title.

A word counter sits alongside all of this because case work and length work are usually the same job. Writers trimming an article to fit a limit, students checking an assignment, and developers naming a variable all want to see the shape of their text while they edit it.

Thirteen conversions, one live statistics panel, and no formatting you did not ask for.

• All upper and all lower case. The two plain conversions, useful for shouting a heading or taming a block of text typed with caps lock on.
• Sentence case. Capitalises the first letter of every sentence and returns the rest to lower case — the standard shape for body copy.
• Title case. Capitalises the significant words in a heading while leaving short joining words alone.
• Programming conventions. camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE, applied consistently across words and existing separators.
• Alternating and inverted case. For mocking text, or for fixing a paragraph that arrived in the wrong case entirely.
• Cleanup conversions. Collapse runs of spaces, or strip line breaks to turn a column of text back into a paragraph.
• Live word count. Words, characters with and without spaces, sentences, paragraphs and lines, recalculated on every keystroke.
• Reading and speaking time. Estimated from the word count at ordinary reading and speaking speeds, so you know how long the text takes to deliver.
• Copy, clear and download. Take the result to your clipboard, empty the box, or save it as a plain text file.

• No reformatting: the output is plain text with no styling carried over, so it pastes cleanly into a CMS, a code editor or a message.
• No typos from retyping: converting is safer than retyping a heading by hand.
• Consistency at a glance: one pass turns a mixed-up block into a single convention.
• Nothing uploaded: the text is processed in your browser, so drafts and client copy stay on your machine.
• One page for two jobs: convert and measure without switching tools.

Writers use it to fix headings, meet a word limit, and see how long a piece takes to read aloud. Anyone pasting copy from a document into a website will find the space and line-break cleanup useful.

Developers use it to convert a label into a variable name, or a database column into a camelCase property. Students and office workers use the word count to keep within a limit, and the sentence and paragraph counts to keep an eye on structure.

Paste the text, press the convention you need, and check the counts before you send it on. What used to be a careful retype is now one click and a copy.

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