Capitalization Tool
A free online capitalization tool with three modes: Title Case, Sentence Case, and Capitalize Each Word. Paste your text, select a mode, and the correctly capitalised result appears instantly — all in your browser, nothing sent to a server.
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The three capitalisation modes explained
Title Case
Title Case capitalises the first letter of each significant word and leaves minor words (articles, short prepositions, and coordinating conjunctions) in lowercase — unless they appear as the first or last word of the title. This follows the most widely used standard in publishing, journalism, and editorial writing, based on the AP Stylebook and Chicago Manual of Style guidelines.
Words left lowercase in title case include: a, an, the, and, but, or, for, nor, yet, so, on, at, to, by, in, of, up, as, via, vs. All other words — including verbs, nouns, adjectives, adverbs, and longer prepositions — are capitalised.
Example: the art of war: a short guide to strategy → The Art of War: A Short Guide to Strategy
Sentence Case
Sentence Case capitalises only the first letter of each sentence — just as you would in normal prose. Everything else stays lowercase. This is the natural capitalisation for body text, email messages, social media posts, and any writing that follows standard grammatical conventions.
The tool detects sentence boundaries by looking for full stops, exclamation marks, and question marks followed by a space. It then capitalises the next letter.
Example: THE QUICK BROWN FOX. IT JUMPED OVER THE DOG. → The quick brown fox. It jumped over the dog.
Capitalize Each Word
Capitalize Each Word makes the first letter of every word uppercase without exception — including articles and prepositions that title case would leave lowercase. This is sometimes called "Start Case" or "Word Case" in text editors and programming libraries. Use it when you need every word capped regardless of standard editorial rules, or when working with proper names and headings that should capitalise every word.
Example: the cat sat on a mat → The Cat Sat On A Mat
When to use each mode
- Title Case: book titles, article headlines, film and song titles, blog post titles, course names, product names, chapter headings. Any title that will appear in a publication or listing.
- Sentence Case: body paragraphs, email subjects, social media captions, product descriptions, UI labels, and anywhere standard prose conventions apply. Sentence case is increasingly preferred in web interfaces because it reads as more natural and approachable.
- Each Word: branded names, column headers in tables, label text in forms, and situations where you want predictable capitalisation regardless of what the word is.
A quick rule of thumb: if it looks like prose, use Sentence Case. If it's a title, use Title Case. If you're not sure, or if it's a proper noun or brand name, use Each Word and then review manually.
Frequently asked questions
What is the difference between title case and sentence case?
Title Case capitalises the first letter of each significant word: "The Quick Brown Fox Jumped." Sentence Case capitalises only the first letter of each sentence: "The quick brown fox jumped." The rest of the sentence stays lowercase.
Which words are not capitalised in title case?
Articles (a, an, the), coordinating conjunctions (and, but, or, for, nor, yet, so), and short prepositions (in, on, at, to, by, of, up, as, via, vs) stay lowercase — unless they appear as the first or last word of the title. Longer prepositions like about, above, across, after, against, between, without are generally capitalised.
What's the difference between Capitalize Each Word and Title Case?
Each Word capitalises every single word without exception, including "a", "the", "and", etc. Title Case follows editorial conventions and leaves those minor words lowercase. "The Cat Sat on a Mat" (Title Case) vs. "The Cat Sat On A Mat" (Each Word).
Can this tool correctly capitalise proper nouns in Sentence Case?
Not automatically. The tool applies mechanical rules and cannot identify proper nouns (like names of people, places, or brands) without understanding the meaning of the text. Sentence Case will only capitalise the first letter of each sentence — proper nouns in the middle of a sentence will need to be fixed manually.
Is the tool remembering my mode choice?
Yes. The tool saves both your last-used mode and your input text in your browser's localStorage. When you return to this page, both are restored automatically. This data stays on your device and is never shared.
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