Text Case Swapper

The Text Case Swapper flips the case of every letter in your text at once, changing each uppercase letter to lowercase and each lowercase letter to uppercase. It is the fastest way to invert text that was typed with the wrong Caps Lock state or to create a deliberately mixed-up version of a string for testing or styling.

It is handy for anyone who has accidentally typed a sentence in the wrong case, for developers building test data that mixes cases, and for writers who want to quickly see how a heading looks with its capitalisation reversed. Rather than retyping the whole thing or fixing letters one by one, you paste the text and get the swapped version immediately.

The tool works entirely inside your browser using JavaScript, so your text is never uploaded or stored anywhere. Numbers, punctuation, spaces, and symbols are left exactly as they are, and only cased letters are affected, so the structure of your text stays intact while its capitalisation is inverted in a single step.

Features

• Swaps uppercase letters to lowercase and lowercase letters to uppercase in one pass.
• Leaves digits, punctuation, spaces, and symbols untouched so only letters change.
• Works with accented and many non-Latin letters using proper case mapping.
• Updates the result live as you type or paste, with no button to press.
• Reports how many letters were changed in each direction for quick verification.
• Handles text of any length instantly because all work is done on your device.
• Requires no account, no upload, and adds no watermark to your output.

How to use Text Case Swapper

1. Paste or type the text whose case you want to swap into the input box.
2. The swapped-case result appears instantly in the output area.
3. Check the statistics panel to see how many letters changed in each direction.
4. Edit the input further if needed and watch the output update live.
5. Copy the swapped text to your clipboard or export it as a TXT file.

Benefits

• Fixes text typed with Caps Lock on without retyping a single word.
• Creates mixed-case test strings for developers checking case-insensitive logic.
• Lets writers preview how a heading reads with its capitalisation reversed.
• Preserves numbers and punctuation so only the letter casing is affected.
• Keeps private text secure because everything runs locally in your browser.
• Delivers instant results with a clear count of how many letters were flipped.

Case swapping is a purely mechanical transformation, so it is most useful for quick fixes and for generating varied test data rather than for producing polished, correctly capitalised prose. If your goal is proper capitalisation instead of a straight flip, the Sentence Case Converter and the Capitalize Each Sentence tools apply grammatical rules, while the Alternating Case Generator produces the playful aLtErNaTiNg style.

Because the swapper relies on standard Unicode case mapping, it handles accented Latin letters and many other scripts correctly, though a small number of characters have no distinct uppercase or lowercase form and are simply left unchanged. Symbols, emoji, digits, and whitespace are never altered, which means the overall layout and spacing of your text always survive the transformation.