Changing letter case is one of those tiny editing tasks that comes up constantly: converting titles to Title Case, normalizing all-caps copy, fixing sentence case that got lost during copy/paste, or toggling text case for stylistic experiments. Convert Case from Text Mini Tools is a lightweight, private utility that runs entirely in your browser and supports a range of conversions — uppercase, lowercase, simple title case, sentence case, toggle case, and a Smart Title Case option that follows common headline rules to preserve small words and acronyms.
Many content workflows expect consistent casing — SEO-friendly headlines, uniform product titles, or properly formatted metadata. If you copy content from spreadsheets, PDFs, or scraped sources, casing can be inconsistent. This tool helps you fix casing quickly without manual editing. It’s also handy for developers cleaning test data, editors preparing headlines, or anyone who needs a quick format transform on-the-fly.
Title casing has rules: major words are capitalized while small words (conjunctions, prepositions, articles) are kept lowercase unless they appear at the start or end of the title. Our Smart Title Case implements a compact rule set that capitalizes principal words while keeping small words lowercased in the middle of a title. It also preserves all-caps acronyms (like HTML, NASA) when the Preserve Acronyms option is on, and respects punctuation and hyphenation.
Like other Text Mini Tools utilities, Convert Case runs entirely in the browser. Nothing is uploaded to servers, keeping your content private. Conversions are instantaneous for normal documents; the tool is mobile-friendly and works offline after the page loads.
Whether you're editing headlines, cleaning product names, or formatting content for publication, Convert Case is a simple, reliable helper. Paste your text, choose the conversion, and copy or download the result — fast, private, and built for everyday content cleanups.
No — all processing is client-side in your browser.
Smart Title Case capitalizes main words while keeping short connector words lowercased unless they are the first or last word. It also preserves acronyms when enabled.
Yes — check "Preserve ALL-CAPS acronyms" to avoid changing acronyms like NASA or HTML.
Toggle switches each character's case: uppercase letters become lowercase and vice versa.
It uses a simple sentence boundary approach and may not handle complex abbreviations perfectly — review outputs if your text contains many abbreviations.
Yes — click Undo to restore the previous output state during the session.
Yes — Convert Case is free and requires no registration.
No — the tool only changes letter case; punctuation and numbers remain unchanged.
Yes — Unicode letters are supported, though title-casing rules may vary by language; Smart Title Case uses a language-agnostic approach.
Yes — it handles long text, though extremely large files may be limited by browser/device memory.
Yes — diacritical marks are preserved when casing is applied using built-in Unicode functions.
Yes — use the Download (.txt) button to save the converted result.
Yes — the UI is responsive and works on phones and tablets.
The smart algorithm handles common cases but may not always detect specific name casing (McDonald vs Mcdonald). For proper nouns, double-check and edit after conversion.
Yes — use Remove Extra Spaces, Remove Special Characters, or Remove Numbers before or after converting case as part of your cleaning workflow.