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Inverse Case Converter
Flip every letter: capitals become lowercase and lowercase becomes capitals.
Every capital becomes lowercase and every lowercase letter becomes a capital. Running it twice returns your original text exactly.
Quick Tool Overview
The Inverse Case Converter swaps every letter to its other case: capitals become lowercase and lowercase becomes capitals. It is the only conversion that fully repairs a caps lock accident, because the capitals you meant to type are still in the text — just inverted.
- What it does
- Swaps the case of every letter in one pass
- You give it
- Text typed with caps lock on, or any mixed-case text
- You get back
- The exact inverse, with intended capitals restored
- Best for
- Fixing caps lock mistakes without retyping
About the Inverse Case Converter
The classic use for this is the caps lock accident. Typing a paragraph with caps lock on and shift held for the capitals produces text that is exactly inverted — "hELLO tHERE" — and inverting it again restores precisely what you meant to write, capitals and all. No other case conversion can recover that, because the information is still there, just flipped.
Every letter is swapped individually: uppercase becomes lowercase and lowercase becomes uppercase, in one pass. Accented letters, Greek and Cyrillic all invert correctly. Digits, punctuation, spacing and line breaks are untouched, and the operation is perfectly reversible — running it twice returns the original text.
Key features of the Inverse Case Converter
Repairs caps lock exactly
Because the mistake is itself an inversion, inverting again restores the text including the capitals you meant.
Perfectly reversible
Run it twice and you have your original back — nothing is lost in the round trip.
Unicode-aware
Accented Latin, Greek and Cyrillic letters all swap correctly rather than being skipped.
Everything else untouched
Digits, punctuation, spacing and line breaks have no case and pass straight through.
Live as you type
The inverted version updates on every keystroke, so you can see immediately whether it reads right.
How to use the Inverse Case Converter
-
1
Paste the mis-cased text
Typically a paragraph typed with caps lock on by mistake.
-
2
Read the inverted result
Every capital becomes lowercase and every lowercase letter becomes a capital.
-
3
Check it reads correctly
For a caps lock accident this restores the text exactly, including the capitals you intended.
-
4
Copy it back
One click copies the corrected text to your clipboard.
Frequently asked questions
Because typing with caps lock on inverts your intent exactly: the letters you meant as lowercase came out capital, and the ones you shifted for came out lowercase. Inverting again undoes both at once, which no other case conversion can do.
Yes, perfectly. Running the text through twice returns the original exactly, because each letter is simply swapped to its other case and back.
Yes. É becomes é, ß is left alone because it has no single-character uppercase form, and Greek and Cyrillic letters swap correctly using standard Unicode case mapping.
Nothing — they have no case, so they pass through untouched along with all spacing and line breaks.
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