About

Incorrect capitalization degrades readability, breaks code conventions, and signals unprofessionalism in published content. Title Case alone has multiple competing standards (AP, APA, Chicago) that disagree on whether words like "with" or "between" should be lowercased. This tool applies rule-based capitalization across 10 distinct modes, including developer-oriented transforms like camelCase, PascalCase, snake_case, and kebab-case. The Title Case algorithm lowercases English minor words (articles, short prepositions, coordinating conjunctions) unless they appear at the start of the string, following a simplified AP Stylebook heuristic.

Limitations: the tool operates on Unicode Basic Latin and common extended characters. It does not perform natural-language parsing, so proper nouns inside sentences are not auto-detected in Sentence Case mode. For programmatic identifiers, non-alphanumeric characters are stripped during conversion to camelCase and PascalCase. Pro tip: paste your headline, cycle through Title Case and Sentence Case, then compare which reads better for your audience before committing.

Formulas

Each mode applies a deterministic character-level transformation. The core operation for basic capitalization is a character code shift:

C_upper = fromCharCode(charCodeAt(c) − 32) if 97 ≤ charCodeAt(c) ≤ 122

Where c is the input character. The offset 32 is the distance between lowercase and uppercase ASCII Latin letters (97 for "a", 65 for 'A'). For Smart Title Case, a set M of minor words is defined:

M = {a, an, the, and, but, or, nor, for, in, on, at, to, by, of, up, as, is, it, so, if, vs}

A word w_i is lowercased when w_i ∈ M ∧ i ≠ 0. For developer cases, words are first extracted by splitting on non-alphanumeric boundaries, then joined with the target delimiter (_ for snake, - for kebab, empty string for camel/Pascal).

Reference Data

Mode	Input Example	Output Example	Use Case
Title Case	the quick brown fox	The Quick Brown Fox	Headlines, Book Titles
Sentence case	hello world. goodbye world.	Hello world. Goodbye world.	Body text, Paragraphs
UPPER CASE	hello world	HELLO WORLD	Acronyms, Emphasis
lower case	Hello World	hello world	Normalization, Search keys
camelCase	get user name	getUserName	JavaScript variables
PascalCase	get user name	GetUserName	Class names, C# methods
snake_case	Get User Name	get_user_name	Python, Ruby, SQL columns
kebab-case	Get User Name	get-user-name	CSS classes, URL slugs
tOGGLE cASE	Hello World	hELLO wORLD	Stylistic, Memes
aLtErNaTiNg	hello world	hElLo WoRlD	Sarcasm text, Mocking
CONSTANT_CASE	max retry count	MAX_RETRY_COUNT	Constants in code
dot.case	Get User Name	get.user.name	Object paths, Config keys
Capitalize First	hello world	Hello world	Form fields, Labels
Smart Title Case	war of the worlds	War of the Worlds	AP/Chicago-style titles

Frequently Asked Questions

Basic Title Case capitalizes the first letter of every word indiscriminately. Smart Title Case lowercases minor English words - articles (a, an, the), short prepositions (in, on, at, to, by, of), and coordinating conjunctions (and, but, or, nor, for) - unless they appear as the first word. This follows a simplified AP Stylebook convention. Words longer than 3 characters are always capitalized.

The tool uses JavaScript's native toUpperCase() and toLowerCase() methods, which support Unicode beyond Basic Latin. Characters like ñ, ü, ø, and é are correctly transformed. However, developer modes (camelCase, snake_case, etc.) strip non-alphanumeric characters during word boundary detection, which may remove diacritics in identifier output.

The algorithm splits input on any sequence of non-alphanumeric characters (spaces, hyphens, underscores, dots, etc.) using a regex pattern. Each resulting token is lowercased, then the first character is uppercased (for PascalCase, all tokens; for camelCase, all except the first). Empty tokens from consecutive delimiters are discarded.

No. Sentence Case operates syntactically, not semantically. It lowercases all characters, then capitalizes the first letter after each sentence terminator (., !, ?) followed by whitespace, plus the very first character. Proper nouns like country names or personal names will be lowercased unless you manually correct them after conversion.

Yes. The tool preserves all whitespace, including line breaks and multiple spaces. Sentence Case recognizes terminators across lines. Developer modes (camelCase, snake_case) treat line breaks as word boundaries, so multi-line input produces a single concatenated identifier - paste one phrase per conversion for best results.

The tool processes text in-browser with no server round-trip. Practical limits depend on your device's memory. Strings up to 500,000 characters convert in under 100 ms on modern hardware. LocalStorage persistence is capped at approximately 5 MB per origin, roughly 2.5 million UTF-16 characters.