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Free Online Case Converter

Switch between sentence, title, upper and lower case.

Your input stays on this device. Processing is bounded; regex runs in a worker with a two-second timeout.

Result



How to use Case Converter
Switch between sentence, title, upper and lower case. Sentence mode capitalizes after terminal punctuation; title mode capitalizes whitespace-delimited words. Proper nouns are not inferred.
  1. Set Input.
  2. Set Case.
  3. Run the tool, review the result and its stated limitations, then copy or download if needed.
Example & practical use
Switch between sentence, title, upper and lower case. The example below demonstrates Input; Case.
Example input:
{
  "text": "hello WORLD",
  "mode": "title"
}
Expected result (relevant fields):
"Hello World"
Features & result limitations
Sentence mode capitalizes after terminal punctuation; title mode capitalizes whitespace-delimited words. Proper nouns are not inferred.
Frequently asked questions
What inputs does Case Converter accept?
Input; Case
How should I interpret the Case Converter result?
Sentence mode capitalizes after terminal punctuation; title mode capitalizes whitespace-delimited words. Proper nouns are not inferred.
Where does Case Converter process my data?
Inputs are processed locally in your browser. Submitted text is not sent to external services. A successful-run event increments an aggregate tool counter without your input.