Case Conversion: UPPER, lower, camelCase

Quick answer: Convert text between UPPERCASE, lowercase, Title Case, Sentence case, and code-style camelCase. Open 大小写转换 — everything runs locally in your browser, and files never leave your device.

Steps

1. Paste text into the Case Converter.
2. Pick the target style.
3. Copy the converted output.

Important notes

• Only letters are affected — mixed Chinese/English text is safe to process in full.
• Title Case skips articles like "a" and "of" per English convention; if you want every word capitalized, use Start Case instead.
• camelCase and snake_case are for code identifiers and produce odd results on plain sentences.

Common questions

It lowercased my brand name! Sentence case will do that — spot-check proper nouns or pick a different mode.

Can I convert a whole document? Yes, paste it all at once; there is no practical size limit.

Pro tips

Case conversion interacts with locale in ways worth respecting: Turkish dotted/dotless i means uppercase("i") is not always "I" depending on locale rules, and German ß uppercases to SS. For identifiers (camelCase, snake_case), decide the splitting rule for acronyms first — parsing "parseXMLDocument" to snake_case gives different results depending on whether XML is treated as one word. For datasets, convert case only at the boundary (display or matching), never in stored source data: the original case is information, and lowercasing everything destroys it.

Why did Title Case capitalize my hyphenated words? Title-case rules treat hyphenated compounds as separate words ("Mother-In-Law") — style guides differ; adjust manually if your house style says otherwise.