What is Sentence case?

Sentence case capitalizes only the first letter of each sentence and lowercases the rest — the way normal sentences are written. "hello world. HOW ARE YOU?" becomes "Hello world. How are you?"

What is the difference between Title Case and Capitalize Each Word?

Capitalize Each Word capitalizes every single word. Title Case is similar but keeps small connector words like "a", "the", "of" and "and" lowercase in the middle of a title, which matches how titles are usually styled.

What are camelCase and snake_case used for?

These are naming styles used in programming. camelCase and PascalCase are common for variable and class names in languages like JavaScript and Java. snake_case is common in Python and in database column names. kebab-case is common in URLs and file names.

Does converting change my original text?

No. Your typed text stays in the input box exactly as you wrote it. Every conversion appears in a separate output box, so you can try different formats without losing what you started with.

Text Case Converter

Convert text to UPPERCASE, Title Case, camelCase and more.

Local Processing

Your input is processed in your browser.

Input

Choose a format

For everyday writing

For code and file names

Output

Your input above is never changed.

Private by design

Your data is processed directly in your browser. It is not sent to Stay Local Tools servers for processing. Because the work happens on your device, nothing you type here leaves your browser unless you choose to copy or share it yourself.

Note: the website itself still loads normal web files, and may use analytics or ads later. The promise here is about the files and text you put into these tools.

How to Use

Type or paste your text into the input box.
Choose a format, such as UPPERCASE or Title Case.
The result appears in the output box below — your original input is not changed.
Press Copy to copy the result.

Formats for everyday writing

Sentence case matches how normal sentences are written: only the first letter of each sentence is capitalized. Title Case is used for headings and titles — it capitalizes most words but keeps small words like "a", "of" and "the" lowercase unless they start the title. Capitalize Each Word is simpler still: every word gets a capital letter, with no exceptions.

camelCase, PascalCase, snake_case and kebab-case

These formats remove spaces and join words together, which is why they are used for things like variable names, file names and URLs that cannot contain spaces. camelCase starts with a lowercase letter and capitalizes the start of each following word (myVariableName). PascalCase capitalizes every word, including the first (MyClassName). snake_case joins words with underscores (my_variable_name), and kebab-case joins them with hyphens (my-file-name).

Questions and Answers

: Sentence case capitalizes only the first letter of each sentence and lowercases the rest — the way normal sentences are written. "hello world. HOW ARE YOU?" becomes "Hello world. How are you?"
: Capitalize Each Word capitalizes every single word. Title Case is similar but keeps small connector words like "a", "the", "of" and "and" lowercase in the middle of a title, which matches how titles are usually styled.
: These are naming styles used in programming. camelCase and PascalCase are common for variable and class names in languages like JavaScript and Java. snake_case is common in Python and in database column names. kebab-case is common in URLs and file names.
: No. Your typed text stays in the input box exactly as you wrote it. Every conversion appears in a separate output box, so you can try different formats without losing what you started with.

Other Languages

Español

Cambiar mayúsculas y minúsculas

Convierte tu texto a MAYÚSCULAS, minúsculas, Title Case, camelCase y otros formatos. El texto se procesa directamente en tu navegador y no se sube a los servidores de Stay Local Tools para el procesamiento.

Preguntas frecuentes

: Pone en mayúscula solo la primera letra de cada oración y el resto en minúscula, como se escribe normalmente.
: Capitalize Each Word pone en mayúscula cada palabra. Title Case es parecido pero deja en minúscula palabras cortas como "a", "el" o "de" en medio del título.
: Son estilos de nomenclatura usados en programación. camelCase se usa mucho en JavaScript y Java; snake_case es común en Python.

Português (Brasil)

Mudar maiúsculas e minúsculas

Converta seu texto para MAIÚSCULAS, minúsculas, Title Case, camelCase e outros formatos. O texto é processado diretamente no navegador e não é enviado aos servidores do Stay Local Tools para processamento.

Perguntas frequentes

: Deixa em maiúscula só a primeira letra de cada frase e o resto em minúscula, como se escreve normalmente.
: Capitalize Each Word deixa cada palavra em maiúscula. Title Case é parecido, mas mantém em minúscula palavras curtas como "a", "de" ou "e" no meio do título.
: São estilos de nomenclatura usados em programação. camelCase é comum em JavaScript e Java; snake_case é comum em Python.

한국어

대소문자 변환

텍스트를 대문자, 소문자, Title Case, camelCase 등 다양한 형식으로 바꿀 수 있습니다. 텍스트는 브라우저에서 직접 처리되며 Stay Local Tools 서버에 업로드되지 않습니다.

자주 묻는 질문

: 각 문장의 첫 글자만 대문자로 하고 나머지는 소문자로 바꿉니다.
: Capitalize Each Word는 모든 단어를 대문자로 시작합니다. Title Case는 비슷하지만 "a", "the", "of" 같은 짧은 연결어는 소문자로 유지합니다.
: 프로그래밍에서 사용하는 이름 표기법입니다. camelCase는 JavaScript나 Java의 변수명에, snake_case는 Python에 흔히 쓰입니다.