Case Converter

Free, no sign-up: paste your text and pick a mode — UPPERCASE, lowercase, Sentence case, Capitalized Case, Title Case with English rules, iNVERSE, aLtErNaTiNg, and for developers camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case. It also transliterates Russian and Ukrainian into Latin letters (official passport systems) and makes URL slugs. Everything runs in your browser — your text never leaves it.

Your text

Case

For code

Latin script

Transliteration system

Result

Your text never leaves your browser: the conversion runs on your device and nothing is sent to a server.

Key facts

Price: Free
Sign-up: Not required
Processing: In your browser — nothing is sent to our server
Input: Any text or list of lines, typed or pasted
Limits: No limits
Output: Text in 13 case styles, transliteration (GOST 7.79-2000 B, Russian passport, Ukrainian KMU 2010) or a slug; character, word and line counts; copy and .txt
Last updated: 2026-10-13

Alternatives

Other tools for the same job, and what each one does well:

Convert Case — A well-known English converter with lower, UPPER, Sentence, Capitalized, aLtErNaTiNg, Title and InVeRsE case plus many other text utilities; the site shows ads.

When to choose this tool: When you need more than upper and lower case — code styles, official transliteration and slugs in one place, without ads and without sending your text to a server.

Descriptions checked against each tool's own site in October 2026.

Free Online Case Converter

A case converter fixes text typed with Caps Lock on, makes headings consistent and turns phrases into variable and file names. Modes: UPPERCASE, lowercase, Sentence case (a capital only at the start of each sentence), Capitalized Case, Title Case following English headline rules, inverse and alternating case, plus camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and dot.case — line by line, so a whole list converts at once. It also transliterates Russian and Ukrainian into Latin letters using official systems and builds URL slugs. Everything runs in your browser; the text is not sent to a server.

UPPERCASE, lowercase, Sentence case, Capitalized Case

Title Case with lowercase articles, conjunctions and short prepositions

camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case

Transliteration: GOST 7.79-2000, Russian passport (ICAO), Ukrainian KMU 2010

URL slug from any text

Character, word and line counts; text stays in your browser

How to Use

Paste your text into the top field
Click a mode — the result appears below and updates as you edit
Copy the result, download a .txt or send it back to the input

FAQ

Paste the text and click Sentence case: everything becomes lowercase with capitals kept at the start of sentences. Proper names then need a manual fix — they cannot be guessed automatically. If the text looks like “hELLO”, use iNVERSE.

Capitalized Case capitalises the first letter of every word. Title Case follows English headline rules: articles (a, an, the), coordinating conjunctions and short prepositions (in, on, of, to…) stay lowercase unless they are the first or last word or follow a colon.

For Ukrainian use the official passport system of Cabinet Resolution No. 55 of 27 January 2010 (Київ → Kyiv). For a Russian name as in a passport use ICAO Doc 9303 (Юлия → Iuliia); for bibliographies, GOST 7.79-2000 system B. For page addresses choose URL slug — it has no apostrophes or GOST marks.

Paste a phrase or a list (one per line) and click a style: “user profile id” becomes userProfileId, UserProfileId, user_profile_id, user-profile-id or USER_PROFILE_ID. Existing names are split too: userProfileID → user_profile_id.

Yes: in Word select the text and press Shift+F3 to cycle through UPPERCASE, lowercase and Capitalize Each Word; in Google Docs use Format → Text → Capitalization. This tool adds Sentence case, rule-based Title Case, code styles, transliteration and slugs.

Every mode on one example

Mode	“the quick brown fox”	Use it for
Sentence case	The quick brown fox	text typed with Caps Lock on
Title Case	The Quick Brown Fox	English headlines and titles
camelCase / PascalCase	theQuickBrownFox / TheQuickBrownFox	JavaScript and Java variables, class names
snake_case / CONSTANT_CASE	the_quick_brown_fox / THE_QUICK_BROWN_FOX	Python, database columns, constants
kebab-case / dot.case	the-quick-brown-fox / the.quick.brown.fox	CSS classes, file names, config keys

Code styles are applied line by line: paste a list and you get a list back.

How Title Case works here

Every word is capitalised except articles (a, an, the), coordinating conjunctions (and, but, or, nor, for, so, yet) and short prepositions of up to three letters (at, by, in, of, on, to, up, via…). The first and last words and any word after a colon are always capitalised. Words that already contain inner capitals — iPhone, McDonald, NASA — are left as they are when your text has lowercase letters.

Transliterating Russian and Ukrainian

Example	System	Result
Юлия Щукина	Russian passport (ICAO Doc 9303) / GOST 7.79-2000 B	Iuliia Shchukina / Yuliya Shhukina
Знам’янка, Згорани	Ukrainian official (KMU Resolution 55, 2010)	Znamianka, Zghorany
Юлия Щукина	URL slug	yuliya-shchukina

Auto mode detects Ukrainian by the letters і, ї, є and ґ.

Honest limitations

After Sentence case, proper nouns and acronyms become lowercase — software cannot know that “paris” is a city. Check them by hand.
Style guides differ: AP capitalises prepositions of four or more letters (with, from), Chicago lowercases all prepositions. We follow the AP-style rule above.
There is no reverse transliteration (Latin → Cyrillic). Scripts other than Cyrillic and Latin with diacritics are dropped from slugs.
To change case inside a document, built-in tools are faster: Shift+F3 in Word, Format → Text → Capitalization in Google Docs.