Smart Capitalization Tool

Paste any block of text and pick from seven capitalisation modes — the result updates as you type. The live preview strip below the editor shows all seven outputs at once, so you can compare modes before committing to one. Clicking any row in the strip switches the active mode.

Title Case is the most involved of the seven. It capitalises major words and skips a built-in list of 19 small words — articles (a, an, the), common prepositions (at, by, in, of, on, to, up, via), and coordinating conjunctions (and, but, or, nor, for, so, yet). The first word of each line is always capitalised regardless of what it is.

The Load Sample button fills the input with a three-sentence passage drawn from two classic novels — the quick brown fox, the opening of A Tale of Two Cities, and Hamlet's soliloquy. That passage shows how Title Case handles articles and prepositions mid-sentence while always capitalising the first word.

What Each Mode Does to Your Text

• Title Case: skips the 19 small words; capitalises everything else. The first and last word of each line are always capitalised. Best for article headlines, chapter titles, and page headings.
• Sentence case: lowercases the full input first, then capitalises after every ., !, or ?. Use this to fix text pasted from a source that was in ALL CAPS.
• First word only: capitalises the very first word and lowercases everything else. Useful for single labels or call-to-action buttons.
• Capitalise all words: runs \b\w over the text and uppercases the first letter of every whitespace-separated token. Does not skip small words.
• aLtErNaTiNg: letter 1 lowercase, letter 2 upper, repeating. Non-letter characters skip the counter, so a1b2c becomes a1B2c.
• iNVERT cASE: every uppercase character becomes lowercase and vice versa. Useful for reversing accidental Caps Lock.
• Each line: treats each newline-separated line as independent and capitalises only its first letter. Useful for bullet lists and poetry.

Tricky Inputs: Small Words and Line Breaks

• Title Case forces the first word of every line to uppercase even when it is a small word. So the quick brown fox on its own line becomes The Quick Brown Fox.
• Sentence case splits on . ! ? only. An abbreviation like Dr. triggers a capitalised word after the period — no abbreviation list is maintained.
• Alternating mode skips digits and punctuation in the flip count. The input a1b2c produces a1B2c because 1 and 2 do not advance the alternator.
• Each Line and First Word Only both lowercase the remainder of the affected text. To preserve mixed case in the rest of the line, use Capitalise All Words or Title Case instead.
• An empty input produces an empty output immediately. The live preview strip only appears once at least one character is present.