Convert text to UPPERCASE, lowercase, Title Case (AP, APA, Chicago) or Brazilian Portuguese titles, and code names to camelCase, snake_case, kebab-case and more. All in your browser.
Changing the case of a text looks trivial until Unicode gets involved: the German ß becomes SS in capitals, the Turkish i has a dotted (İ) and a dotless (ı) form, and the correct title of a work changes with the style guide. This tool has four modes. Text gives you UPPERCASE, lowercase, Brazilian Portuguese titles (articles, prepositions and short conjunctions in lowercase), English Title Case in AP, APA and Chicago styles, Sentence case, Capitalize Each Word, alternating, inverse and tOGGLE. Identifier splits a name into words and rewrites it as camelCase, PascalCase, snake_case, SCREAMING_SNAKE_CASE, kebab-case, Train-Case, dot.case, path/case, COBOL-CASE, flatcase or Pascal_Snake_Case, handling acronyms (XMLHttpRequest becomes xml_http_request), digits, accents and leading or trailing underscores. Code converts every compound identifier in a snippet without touching strings, comments or reserved words. All shows every conversion at once so you can copy the one you need.
The style guides agree on the basics: first and last word capitalized, articles (a, an, the) in lowercase. They differ on prepositions and conjunctions. APA 7th edition lowercases words of three letters or fewer (and, as, but, for, if, nor, or, so, yet, at, by, in, of, off, on, per, to, up, via) and capitalizes words of four letters or more, such as With, From and Between. AP uses the same four-letter threshold for prepositions and conjunctions. Chicago works differently: prepositions stay lowercase whatever their length (over, between, through), and so do to and as in any function.
Brazilian Portuguese has no mandatory rule for titles. The 1990 Orthographic Agreement allows capital or lowercase initials on unstressed words in book titles, with the first word and proper nouns always capitalized. The tool applies the most common editorial convention: articles, prepositions, contractions (do, da, no, pelo) and short conjunctions in lowercase. Note that e (conjunction) stays lowercase while é (the verb, stressed) is capitalized. No word list can recognize proper nouns or grammatical function, so review the result.
Converting between formats starts by finding the word boundaries. The tool splits on separators (space, underscore, hyphen, dot, slash), on the step from lowercase to uppercase (fooBar becomes foo and Bar), and inside a run of capitals when the last capital opens a new word: XMLHttpRequest splits into XML, Http, Request, which is why the snake_case form is xml_http_request. The same rule turns iOS into i_os, which is how well-known libraries behave; turn on Keep acronyms if you want to preserve OS.
Digits stay attached to their word by default (user_id2 becomes userId2 and base64Encode becomes base64_encode), with an option to split them. Leading and trailing underscores and dollar signs (__private, _id, $el) are kept in the formats where that makes sense. Accents and letters from other scripts (açaí, 日本語, γειά) are preserved, or transliterated to ASCII if you turn Keep accents off.
Paste the code into your HTML and the tool shows up on your page, without J-Kit's navigation and ads. It still runs in the browser of whoever visits your site.
<iframe
src="https://jkit.tools/embed/en-US/case-converter"
width="100%"
height="600"
style="border:0"
loading="lazy"
title="Case Converter"
></iframe>These references help contextualize formulas, standards, APIs and limitations used on this page. They do not replace professional validation when a result has legal, financial, medical or operational impact.
Sentence case capitalizes only the first letter of each sentence. Title Case applies a style guide: content words capitalized, short articles, prepositions and conjunctions lowercase. Capitalize Each Word just capitalizes the first letter of every word and leaves the rest alone, like CSS capitalize.
Every letter in capitals. Some letters grow: ß becomes SS.
The result shows up here.