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English case converter
Convert ASCII English letters to upper, lower, title or sentence case.
Runs in your browser · No file or text uploads
Preparing your tool…
What English case converter helps you do
Standardize English capitalization while leaving other scripts, numbers and punctuation unchanged.
How to use it
- Enter the text to convert.
- Choose a case rule.
- Review proper names and acronyms in the result.
Input and output example
INPUT
hello WORLDOUTPUT
HELLO WORLD
Supported formats and limits
- Only ASCII A–Z and a–z are changed. Other Unicode characters are preserved.
- This is a mechanical case converter, not grammar correction or an editorial title-style engine.
How the result is calculated
Title case capitalizes English letters at JavaScript word boundaries. Sentence case capitalizes the first English letter at the start or after . ! ? followed by whitespace. Other English letters become lowercase.
Frequently asked questions
Will accented or non-Latin letters change?
No. This tool deliberately changes only ASCII English letters.
Will acronyms such as API be preserved?
Title and sentence modes lowercase the remaining English letters. Review acronyms after conversion.