Case Converter

About the Case Converter

Case conventions are silent quality signals. A headline in the wrong case looks amateur to an editor; a variable in the wrong case fails a code review. This tool converts between the conventions writers and programmers actually use, without you retyping anything.

For writers: title case is not "capitalize everything"

Proper title case follows style-guide rules: capitalize the first and last word, all nouns, verbs, adjectives and adverbs — but lowercase short prepositions, articles, and conjunctions ("of", "the", "and"). AP style lowercases prepositions under four letters; Chicago lowercases them all regardless of length. Sentence case, preferred by most European publications and increasingly by tech companies (Google, Apple docs), capitalizes only the first word and proper nouns.

For programmers: each ecosystem has a dialect

camelCase dominates JavaScript and Java variables; PascalCase marks classes and React components; snake_case is Python's standard for functions and variables (PEP 8); kebab-case appears in URLs, CSS classes, and CLI flags; SCREAMING_SNAKE_CASE signals constants almost everywhere. Converting a list of identifiers between conventions — say, mapping a Python API's snake_case fields to a JavaScript client's camelCase — is exactly the tedious, error-prone job this tool automates.

Local and instant

Conversion happens in your browser on every keystroke. Paste a hundred headlines or a thousand identifiers; nothing is sent anywhere, and there's nothing to wait for.