Title case creates visual emphasis
Major words are capitalized while many short articles, conjunctions, and prepositions remain lowercase unless first or last.
Sentence case reads like prose
Only the first word and known proper nouns or acronyms require capitalization.
Automation cannot know every proper noun
A converter can preserve supplied acronyms but cannot reliably infer brands, personal names, or discipline-specific conventions.
Pick one product convention
Interface labels feel more coherent when the same style is used at the same hierarchy. Record exceptions instead of switching ad hoc.
Supply acronyms instead of asking the converter to guess
A sequence such as api can be a normal word fragment in one context and the acronym API in another. Add known acronyms as a comma-separated list so title and sentence modes can restore them consistently, including a simple plural such as APIs. Proper names, branded capitalization, and discipline-specific terms still require review. Keep the list scoped to the batch: a global exception can create surprising capitalization when the same letters have a different meaning elsewhere.
Review by hierarchy, not only by spelling
Apply the chosen style separately to page titles, section headings, buttons, menu labels, and full sentences. Title case can create useful emphasis in a short heading but look busy across dense settings; sentence case often reads more naturally in instructions. Preserve lines when each line is an independent label or filename. After conversion, scan punctuation, apostrophes, hyphenated terms, proper nouns, and the first and last word of every title before publishing.