Inverse Case Converter - Swap Upper/Lowercase
What is an inverse case converter?
An inverse case converter flips each letter’s case: uppercase becomes lowercase and lowercase becomes uppercase. Use it to correct caps-lock errors, create stylized text, or test case sensitivity. Processing stays in your browser for privacy.
How to use the inverse case converter
- Enter text: Paste sentences, labels, or code snippets.
- Convert: Click Inverse case to swap casing.
- Copy or download: Copy the result or save it as a text file.
Why use this tool?
- Fix caps-lock slips: Repair accidentally shouted text fast.
- Testing: Check how case-sensitive systems respond to inverted inputs.
- Styling: Add a quick twist to social captions.
Use case 1: Caps-lock recovery
Turn THIS EMAIL into this email with a single click.
Use case 2: Case sensitivity checks
Invert sample usernames or IDs to test validation rules.
Use case 3: Lighthearted posts
Swap case for a playful look in chats.
Examples
Basic example
Input: Launch Today at Noon
Output: lAUNCH tODAY AT nOON
Advanced example
Input: apiKey=SecretToken123
Output: APIkEY=sECRETtOKEN123
Common errors
Mixed acronyms
Acronyms get lowercased; adjust manually if they should stay uppercase.
Non-letter characters
Numbers and symbols stay unchanged, which is expected.
Tips and proven approaches
- If you need only the first letter capitalized, use the sentence case converter.
- For full lowercase, try the lowercase converter.
- Combine with the reverse text generator for mirrored, swapped text.
Related tools
- Create alternating patterns with the alternating case converter.
- Standardize variables with the camelCase converter.
Privacy and security
Conversion runs locally in your browser. No text is uploaded or stored.