Capitalization · Free · In your browser
Convert any text to UPPER CASE, lower case, Sentence case, or Title Case - with real, style-guide-accurate capitalization for AP, Chicago, APA and MLA, plus developer cases like camelCase and snake_case.
A case converter changes the letter case of your text - switching uppercase to lowercase, capitalizing each word, or applying proper Title Case - in one click.
Type or paste text - or try an example:
0 words · 0 chars
🔒 Runs entirely in your browser - open DevTools → Network and you'll see zero requests. Works offline.
The short version
There is no server and no upload. Everything runs with plain JavaScript on your device, so you can safely work with confidential or unpublished text. Open your browser's DevTools Network tab while you use it and you'll see zero requests - and it keeps working with your connection turned off.
In the margin
Title Case capitalizes the major words of a heading (and lowercases small words like “the”, “of” and “and”). Sentence case capitalizes only the first word of each sentence plus proper nouns - the way normal prose is written.
Mostly prepositions. AP capitalizes prepositions of four or more letters (From, With, Into) and lowercases short ones. Chicago lowercases all prepositions regardless of length. This converter applies each guide’s real small-word rules.
No. Everything runs in your browser with plain JavaScript - your text is never uploaded, stored, or logged. Open your browser’s DevTools Network tab while you use it and you’ll see zero requests. The tool also works offline.
Margin note
Every tool here runs 100% in your browser. Open DevTools → Network while you use one and you'll see zero requests - your text never leaves your device. Prefer the deep dives? Read the writing on Penluma.