What is toggle/swap case?

Toggle case, swap case, and inverse case all refer to the same operation: flipping every letter's case individually.

If I run it twice, do I get back the original?

Yes. Inverse case is its own inverse — applying it twice always returns the original text exactly.

Basic Case Tool

Flip the case of every character — uppercase becomes lowercase and vice versa.

Every single character's case is flipped — no letters are left unchanged.

Applying inverse case twice returns the original text exactly.

Handles international characters with case pairs, like é↔É and ü↔Ü.

1
Paste your text
Enter text with any casing — it works from any starting state.
2
View the inverted output
Every uppercase letter becomes lowercase and vice versa, shown instantly.
3
Copy the result
Click Copy or Ctrl+Shift+C to save the result to clipboard.

Mixed input

Input

Hello World

Output

hELLO wORLD

From CAPS LOCK

Input

I ACCIDENTALLY HIT CAPS LOCK.

Output

i accidentally hit caps lock.

: Toggle case, swap case, and inverse case all refer to the same operation: flipping every letter's case individually.
: Yes. Inverse case is its own inverse — applying it twice always returns the original text exactly.