Inverse Case Converter
Flip the case of every letter in your text online. Free inverse case converter — uppercase becomes lowercase and vice versa.
Three steps to get started
Paste your text
Type or paste text in any case into the input field.
Case is inverted
Every uppercase letter becomes lowercase and vice versa — instantly.
Copy or download
Click Copy to clipboard or download as a .txt file.
Flip the case of every letter instantly
Inverse case (or toggle case) is the simplest possible case transformation: every uppercase letter goes to lowercase, and every lowercase letter goes to uppercase. The original casing of each character determines the output.
One practical use: you've been typing with Caps Lock accidentally inverted — "hELLO, mY nAME iS jOHN" — and you need to fix it fast. Run it through the inverse case converter and get "Hello, My Name Is John" back (well, the mirror of the mistake).
Applying inverse case twice returns you to the original. This idempotent property makes it useful as a quick visual toggle — great for generating contrast or emphasis in creative writing, social media posts, or playful typography.
The conversion uses JavaScript's built-in character comparison and handles Unicode characters, accented letters, and international alphabets correctly. All processing happens entirely in your browser.