Case Converter
Convert between uppercase and lowercase
Tool Guide
Introduction
The online English case converter quickly transforms text between uppercase, lowercase, title case, and sentence case. Only English letters are affected — numbers, symbols, and non-Latin characters remain unchanged.
Conversion Modes
- UPPERCASE: Converts all letters to uppercase. Commonly used for code constants, headings, or emphasis.
- lowercase: Converts all letters to lowercase. Useful for normalizing text or fixing accidental caps lock.
- Title Case: Capitalizes the first letter of each word. Ideal for English article or book titles.
- Sentence case: Capitalizes only the first letter of each sentence, following standard writing conventions.
How to Use
Step 1: Paste or type the English text you want to convert into the input box.
Step 2: Click the desired conversion mode button (UPPERCASE / lowercase / Title Case / Sentence case).
Step 3: View the converted text in the result area and copy it for use.
Use Cases
Code development: Quickly format variable or constant names (e.g., UPPER_CASE, camel Case).
Article titles: Standardize English titles following APA, Chicago, or other style guides.
Email editing: Fix accidentally typed ALL-CAPS text caused by caps lock.
Content operations: Batch-normalize English casing in marketing copy or documents.
FAQ
Q: Will Chinese or other non-Latin characters be affected?
A: No. Only English letters are converted. Chinese characters, digits, and other symbols remain unchanged.
Q: What is the difference between Title Case and Sentence case?
A: Title Case capitalizes the first letter of every word (used for titles). Sentence case only capitalizes the first letter of each sentence, matching normal writing conventions.
Q: Is the original text preserved after conversion?
A: Yes. The input box retains the original text, and the converted result is shown separately below for easy comparison.