When each case style is used
UPPERCASE and Title Case are common in headings; Sentence case matches normal prose and is generally recommended for UI text and headings in modern style guides; camelCase and PascalCase are used for variable, function and class names in most programming languages; snake_case is the convention in Python and most database column names; kebab-case is common in URLs, CSS class names and command-line flags. Converting by hand is slow and error-prone, especially across a long document.
camelCase vs PascalCase vs snake_case vs kebab-case
These four all solve the same problem - joining words together without spaces - using different conventions. camelCase and PascalCase use capital letters to mark word boundaries (the only difference is whether the very first letter is capitalized); snake_case and kebab-case instead use an underscore or hyphen as a separator and keep every letter lowercase. Which one to use isn't a matter of preference once you're working inside an existing codebase or style guide - it's usually dictated by the language or system you're working in, since mixing conventions within one project reads as inconsistent.
Why this tool's kebab-case differs slightly from its Text to Slug tool
kebab-case here is a general-purpose case style for any text. For an actual URL slug specifically, the Text to Slug tool additionally converts accented letters to their plain-ASCII equivalent and is built around that one use case - worth using instead when the output needs to become part of a real URL.
Why Sentence case is increasingly preferred for UI text
Modern design style guides (including many major tech companies') increasingly recommend Sentence case over Title Case for buttons, headings, and UI labels, since it reads as more natural and less visually "shouty" than capitalizing every word - Title Case still has its place in formal headlines and print-style contexts, but the trend in interface design has shifted toward the more conversational Sentence case.
A caveat worth knowing about this tool's Title Case
This tool capitalizes the first letter of every word; proper title-case style guides sometimes keep short words like "a," "of," and "the" lowercase (following rules like AP or Chicago style) - always double-check an important headline manually against your specific style guide if that distinction matters for your context.
Where camelCase actually comes from
camelCase gets its name from the visual pattern of alternating lowercase-then-capital letters resembling a camel's humps - it's the convention for variable and function names in JavaScript and many other programming languages specifically because spaces aren't allowed in identifiers, so capitalization is used instead to mark word boundaries.