Practical guide and verification
Choose a capitalization rule that matches the destination
Capitalizing every token is different from editorial title case. Headings, names, product labels and sentence text can follow different conventions, so select an explicit rule rather than assuming every word should always begin with an uppercase letter.
Protect acronyms and intentional casing
Acronyms, chemical symbols, camelCase identifiers and brand names may already contain meaningful capitalization. Review output that will be published or used as an identifier, because an automatic case transform cannot know every domain-specific exception.
Watch punctuation and word boundaries
Hyphens, apostrophes, slashes and Unicode punctuation affect where a word begins. A rule that looks correct for simple English words may need manual review for names, contractions, non-Latin scripts or mixed technical text.
Use locale-aware behavior when it matters
Uppercase and lowercase mappings are not identical across every language. Turkish dotted and dotless I are a common example. Use the locale option when the source language requires it and avoid applying an English-only expectation to multilingual data.
Compare transformed text before replacing the source
Case conversion changes presentation, and sometimes meaning, without preserving an automatic undo history. Keep the original text until you have sampled the transformed output, especially when processing lists that will be pasted into code, spreadsheets or publishing systems.