Free Online Case Converter

About this case converter

Pasted text arrives in the wrong case all the time: headings shouted in ALL CAPS from a PDF, titles typed entirely in lowercase, or a paragraph that needs proper sentence capitalization before publishing. Fixing it by hand is tedious and easy to get wrong. This free case converter changes the capitalization of any text instantly, with six modes covering every common need — from document headings to social media styling.

The details are handled properly, not approximately. Title Case capitalises the first letter of each word while treating apostrophes inside words sensibly, so "don't" becomes "Don't" and "o'clock" becomes "O'clock" — avoiding the "Don'T" error that cruder converters produce. Sentence case lowercases everything first, then capitalises the first letter after each sentence-ending mark, which is ideal for normalising pasted paragraphs. Capitalized Case uppercases only the very first letter of the whole text, and aLtErNaTiNg case gives you the stylised alternating look in one click.

Conversion happens instantly on your device, and you can copy the result or download it as a .txt file — handy for moving cleaned-up text into documents, emails or content management systems.

Worked examples

Here is what each mode does to real text, so you know exactly what to expect before you click. Take the sentence hello world: UPPERCASE gives HELLO WORLD, lowercase gives hello world, and aLtErNaTiNg gives hElLo wOrLd — letters at even positions are lowercased and letters at odd positions are uppercased, with spaces still counting as positions. Title Case turns the quick-brown fox into The Quick-Brown Fox, and it treats apostrophes inside words sensibly: don't stop o'clock becomes Don't Stop O'clock, not "Don'T". Sentence case normalises a messy paragraph: HELLO. THIS IS A TEST! works? yes. becomes Hello. This is a test! Works? Yes. And Capitalized Case reduces hELLO WORLD to Hello world.

Who uses a case converter

Writers and editors rescue headings and pasted quotes: a title copied from a PDF in ALL CAPS becomes proper Title Case in one click, and a paragraph pasted from an email thread gets natural sentence capitalisation. Developers reformat string literals, log output and configuration values — shouted constants from a config file become readable lowercase or title case for documentation. Students fix the accidental caps-lock paragraph before submitting an essay. Marketers and social media managers match each platform's conventions: sentence case for a LinkedIn post, Title Case for a headline, aLtErNaTiNg for a playful caption. Data-entry workers cleaning spreadsheets normalise inconsistent name columns — SMITH, Smith, smith — to one style before import. Because nothing leaves the browser, even confidential drafts and client copy are safe to paste.

How to use

1. Paste or type your text into the input box.
2. Click a case button — UPPERCASE, lowercase, Title Case, Sentence case, Capitalized case or aLtErNaTiNg.
3. The converted result appears immediately below.
4. Use Copy to copy it, Download .txt to save it as a file, or Clear to start over.

Limitations

• Title Case follows standard word-boundary rules; style guides differ on small words (a, the, of) and this tool capitalises them like any other word.
• Sentence case relies on . ! ? … to find sentence ends — abbreviations like "e.g." may trigger unwanted capitals.
• Locale-specific casing (e.g. Turkish dotted İ) follows standard Unicode rules, not locale-specific ones.
• Very large pastes (megabytes of text) may take a moment; the tool is designed for documents, not bulk data processing.
• aLtErNaTiNg case counts every position, including spaces and punctuation — removing or adding one character shifts the whole pattern.