Text case converter
Convert text to UPPER, lower, Title or Sentence case, or to snake_case and kebab-case for code, using the language’s own rules.
- Runs in your browser
- No upload
- Instant result
Privacy & limitsRuns in your browser. Nothing is uploaded.
Input content stays in this tab; Refentra does not upload or store it. Optional aggregate action counts are sent only with your usage consent. Clear the workspace when finished.
Supported profile: Locale-aware case conversion; acronyms and naming conventions may change.
Maximum text: 200,000 UTF-16 units; parser limits can be smaller. Worker time limit: 15 seconds (regex 1.5 seconds).
Check the input and the result
- Prepare and choose the operation
Choose upper, lower, title, sentence, snake or kebab mode. Keep an original copy if the casing carries meaning.
- Check a concrete example
Use this sample and compare the indicated result: Hello World → snake → hello_world; Hello World → kebab → hello-world
- Check the output before you reuse it
Review acronyms and proper names by hand. Case mappings that follow the locale can expand or change characters.
Answers for this task
Does snake mode split camelCase?
It splits on existing whitespace, underscores and hyphens. Don't expect it to detect the words inside camelCase.
What should I check if the input fails?
Check the selected locale for letters such as the Turkish i. The wrong mode can change identifiers where the case is intentional.
Where does this tool stop?
Mechanical casing doesn't follow a publisher’s title style guide, translate text or safely rename references in code.