Free Text Case Converter — Convert to UPPERCASE, lowercase, Title Case

Introduction

Writing code, formatting documents, fixing copied text, or preparing content for a specific system — you constantly need text in a specific case format, and it's rarely in the right one when you start. Retyping or manually fixing case on long strings is error-prone and slow.

This Text Case Converter handles all the major case formats instantly. Paste your text, click a case format, and the converted result is ready to copy. All conversion happens in your browser — nothing is sent anywhere.

Technical & Concept Breakdown

Each case conversion applies a specific transformation rule to the input text:

UPPERCASE: Every character converted to its capital form.

text.toUpperCase() // "hello world" → "HELLO WORLD"

lowercase: Every character converted to its small form.

text.toLowerCase() // "Hello World" → "hello world"

Title Case: First letter of each meaningful word capitalized.

text.replace(/\w\S*/g, w => w.charAt(0).toUpperCase() + w.slice(1).toLowerCase())
// "hello world" → "Hello World"

Sentence case: First letter of each sentence capitalized, rest lowercase.

text.toLowerCase().replace(/(^\s*\w|[.!?]\s*\w)/g, c => c.toUpperCase())
// "hello world. good morning" → "Hello world. Good morning"

camelCase: No spaces, each word after the first starts uppercase.

// "hello world" → "helloWorld"

PascalCase: Like camelCase, but first word also capitalized.

// "hello world" → "HelloWorld"

snake_case: All lowercase, spaces replaced with underscores.

// "hello world" → "hello_world"

kebab-case: All lowercase, spaces replaced with hyphens.

// "hello world" → "hello-world"

CONSTANT_CASE: All uppercase, spaces replaced with underscores.

// "hello world" → "HELLO_WORLD"

Real-World Use Cases

Developers: Convert variable and function names to the correct naming convention for each language — camelCase for JavaScript, snake_case for Python, PascalCase for C#/TypeScript classes.

Content Writers: Fix ALL CAPS text pasted from a PDF or Word document. Convert it to Sentence case or Title Case for use in articles.

CSS/HTML Development: Convert human-readable labels to kebab-case CSS class names or camelCase JavaScript property names.

Database Administrators: Convert column names between snake_case (SQL convention) and camelCase (API convention) when mapping database schemas to API responses.

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