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Letter Case Converter

Convert text between six common cases without retyping. Includes Sentence case, Title Case, alternating, and inverse, useful for headlines, social posts and casual obfuscation.

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How it works

Each mode applies a deterministic transformation: title-case capitalises the first letter of every word, sentence-case capitalises the start and after .!?¡¿, alternating flips by index, and inverse swaps each character's case.

How to use it

  1. Paste the text

    Drop in a headline, a screaming all-caps ticket, a list of names, or any text that needs a different case.

  2. Pick the target case

    Six modes: UPPERCASE, lowercase, Title Case, Sentence case, aLtErNaTiNg, or iNVERSE. Each runs deterministically.

  3. Apply the transform

    Title-case capitalises every word, sentence-case capitalises after .!?¡¿, alternating flips by index, inverse swaps each char.

  4. Copy the converted text

    Take the result into your CMS, your social post, or your taxonomy. Unicode-safe so accents and ñ stay intact.

Use cases

Re-case a headline pasted from a CMS.

Normalise screaming all-caps tickets to sentence case.

Generate aLtErNaTiNg mocking text for memes.

Title-case a list of book or product names.

Your data never leaves your browser

Every utility runs entirely on your device. Nothing is uploaded, nothing is stored on a server. You can disconnect from the internet and they keep working.

Frequently asked questions

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