Free toolRuns on your device
Case Converter
Convert text to upper, lower, title or sentence case with locale-aware rules.
Case conversion workspace
Title case capitalizes each word-like token. Sentence case capitalizes the first letter and letters after a period, question mark or exclamation mark.
01 · Guide
How to use it
Enter text and choose a case style. Conversion uses locale-aware upper and lower casing; title and sentence modes preserve whitespace while changing letter case.
- Paste or type your text.
- Choose a case conversion.
- Review and copy the converted text.
02 · Answers
Frequently asked questions
Does conversion change punctuation?+
No. The tool changes letter case and preserves the original punctuation and spacing.
Does my input leave this device?+
No. The operation runs locally in this browser and MrTools does not receive the entered data.
03 · Next
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