Case Converter

How to use the Case Converter

1. Paste the text you want to convert into the Original text box.
2. Choose a writing style such as Sentence case or Title Case, or a programming style such as snake_case.
3. Check the result in the Converted text box. Your original is not changed, so you can try other styles.
4. Copy or download the result. To apply another change on top, select Use result as original.

Example: one phrase, every style

Starting from the QUICK guide to html emails:

Title Case keeps “to” in lower case because it is a short preposition, and writes “HTML” in capitals because it is a recognised initialism. Sentence case cannot know that “html” is an abbreviation, so check proper nouns and acronyms afterwards.

Why convert case instead of retyping

Text arrives in the wrong case more often than you would expect: a heading typed with caps lock on, a spreadsheet column exported in capitals, a product list that needs consistent title case, or a set of labels that a developer needs as constant names. Retyping is slow and introduces typos. A converter changes the case while leaving every letter, number and punctuation mark exactly as it was.

The rules each style follows

• Sentence case lower-cases the text, then capitalises the first letter of each sentence and the standalone word “I”.
• Title Case capitalises principal words and keeps short articles, conjunctions and prepositions (such as a, and, of, to, in, on) in lower case unless they start or end the title. Common initialisms such as HTML, SEO, USA and PDF stay in capitals. This follows the general approach of major style guides, which differ in details.
• Capitalise Each Word capitalises the first letter of every word with no exceptions.
• Programming styles split each line into words at spaces, punctuation and existing case changes — so userID, user_id and User ID all become the same words — and then join them in the chosen style. Accents are kept.

Case changes use your browser’s Unicode-aware functions, so accented and non-Latin letters such as é, ß and Ω are converted correctly.

Who it is for

Writers and editors tidying headings, marketers standardising product names, data analysts cleaning exported columns, and developers turning human-readable labels into variable, constant or CSS class names.

Limitations to keep in mind

• Sentence case cannot recognise proper nouns, brand names or acronyms, so “paris” and “nasa” stay lower case. Review names after converting.
• Title-case rules vary between style guides (AP, Chicago, APA). The tool uses a common middle ground; adjust individual words if your guide differs.
• Some languages have special casing rules — Turkish dotted and dotless i, for example. The converter uses general Unicode rules, which may not match local conventions.

How your data is handled

Conversion happens instantly in your browser. The text is never transmitted or stored.

Frequently asked questions