Text Tools
Case Converter
Convert text between nine case styles in one click — UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE. Useful for renaming code identifiers, formatting headings and tidying copy.
Your input is processed locally in your browser. It is not uploaded to Dueneo.
Loading Case Converter…
How to use
- 1
Paste your text
Drop identifiers, headings or any text into the input box.
- 2
Pick a case style
Click any of the nine buttons. The output updates immediately and shows the same style applied to a sample.
- 3
Copy or save
Use Copy to put the result on your clipboard, or Save to download converted.txt.
- 4
Try another style
Click another button to re-convert the same input — no need to retype.
Common use cases
- Rename JavaScript identifiers between camelCase and snake_case when porting code between languages.
- Turn a heading into CONSTANT_CASE for an environment variable name.
- Convert ALL CAPS text pasted from a PDF back to readable Sentence case.
- Generate kebab-case slugs from Title Case blog post titles.
Limitations
- Title Case capitalises the first letter of every word, including short words like \"a\" and \"the\".
- Sentence case uses a heuristic for sentence boundaries; abbreviations like \"e.g.\" may stay lower-cased.
- camelCase and PascalCase strip non-alphanumeric characters, which can lose information from the source text.
- Inputs larger than 1 MB are flagged but still processed on the main thread.