CasePilot od ClearanceClarence

CasePilot adds a “Change case” item to the right-click menu for any selected text. Convert instantly—without copying or breaking page layout.

Core: UPPERCASE, lowercase, Capitalise Each Word, Title Case (strict small-word rules), Sentence case
Extras: invert case, AlTeRnAtInG (start upper/lower), sluggify (URL-friendly with language-aware transliteration, e.g. Å→aa, Ø→oe, Æ→ae, ß→ss), kebab-case, snake_case, camelCase, PascalCase, CONSTANT_CASE.

Works in: inputs, textareas, contentEditable, standard page selections, and iframes.
Safe: only text nodes are changed—no classes, ids, or attributes are modified.
Privacy: no data collection, no network requests; everything runs locally.