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ToUpperCase[string]

yields a string in which all letters have been converted to uppercase.

Details
Details and Options Details and Options
Examples  
Basic Examples  
Scope  
Possible Issues  
Neat Examples  
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ToUpperCase

ToUpperCase[string]

yields a string in which all letters have been converted to uppercase.

Details

  • ToUpperCase handles both ordinary and special characters.
  • Variant lowercase characters such as \[CurlyPhi] are converted to their non‐variant uppercase forms.

Examples

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Basic Examples  (1)

Convert characters in a string to uppercase:

Scope  (5)

Everything other than lowercase letters is left unchanged:

ToUpperCase threads itself elementwise over lists:

Accented characters:

Greek letters:

Script letters:

Possible Issues  (2)

The uppercase form of the German ß character is a pair of characters:

ToLowerCase does not give back the original character:

For a few characters, ToLowerCase is not the inverse of ToUpperCase:

Neat Examples  (2)

Check that the German ß character is the only one to have a multicharacter uppercase form:

Find the names of characters for which ToLowerCase is not the inverse of ToUpperCase:

Wolfram Research (1991), ToUpperCase, Wolfram Language function, https://reference.wolfram.com/language/ref/ToUpperCase.html (updated 1996).

Text

Wolfram Research (1991), ToUpperCase, Wolfram Language function, https://reference.wolfram.com/language/ref/ToUpperCase.html (updated 1996).

CMS

Wolfram Language. 1991. "ToUpperCase." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 1996. https://reference.wolfram.com/language/ref/ToUpperCase.html.

APA

Wolfram Language. (1991). ToUpperCase. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ToUpperCase.html

BibTeX

@misc{reference.wolfram_2025_touppercase, author="Wolfram Research", title="{ToUpperCase}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/ToUpperCase.html}", note=[Accessed: 08-August-2025]}

BibLaTeX

@online{reference.wolfram_2025_touppercase, organization={Wolfram Research}, title={ToUpperCase}, year={1996}, url={https://reference.wolfram.com/language/ref/ToUpperCase.html}, note=[Accessed: 08-August-2025]}