Inverse Case Converter
Flip the case of every letter — uppercase becomes lowercase and vice versa.
This tool runs entirely in your browser. Your files are never uploaded to a server.
Paste your text to swap the case of each letter individually, turning every uppercase letter lowercase and every lowercase letter uppercase, based on the original casing of your input.
Frequently Asked Questions
- How is this different from Alternating Case?
- Alternating case applies a fixed toggle pattern regardless of input, while inverse case flips each letter based on its own original case — so the result depends entirely on how your text was capitalized to begin with.
- What happens to numbers and punctuation?
- They're left completely unchanged — only letters have their case flipped; digits, spaces, and symbols pass through as-is.
- If I apply Inverse Case twice, do I get my original text back?
- Usually for ordinary one-to-one cased letters. Some Unicode characters expand or normalize during upper/lower conversion, so text containing cases such as ß is not guaranteed to round-trip exactly.
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