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ToLowerCase
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ToLowerCase

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ToLowerCase[string]

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

Details

Examples

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Basic Examples  (1)Summary of the most common use cases

Convert characters in a string to lowercase:

In[1]:=1
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https://wolfram.com/xid/0n4lxderpgi-q4
Out[1]=1

Scope  (5)Survey of the scope of standard use cases

Everything other than uppercase letters is left unchanged:

In[1]:=1
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https://wolfram.com/xid/0n4lxderpgi-ddt
Out[1]=1

ToLowerCase threads itself element-wise over lists:

In[1]:=1
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https://wolfram.com/xid/0n4lxderpgi-jjl
Out[1]=1

Accented characters:

In[1]:=1
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https://wolfram.com/xid/0n4lxderpgi-fio
Out[1]=1

Greek letters:

In[1]:=1
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https://wolfram.com/xid/0n4lxderpgi-day
Out[1]=1

Script letters:

In[1]:=1
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https://wolfram.com/xid/0n4lxderpgi-fq9
Out[1]=1

Possible Issues  (2)Common pitfalls and unexpected behavior

For the character ϒ, ToUpperCase is not the inverse of ToLowerCase:

In[1]:=1
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https://wolfram.com/xid/0n4lxderpgi-v2g
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0n4lxderpgi-ggj

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

In[1]:=1
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https://wolfram.com/xid/0n4lxderpgi-hxv
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0n4lxderpgi-vvv
Out[2]=2

Neat Examples  (1)Surprising or curious use cases

Find the set of characters that are considered uppercase but have no lowercase form available:

In[1]:=1
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https://wolfram.com/xid/0n4lxderpgi-puhqcs
Out[1]=1
In[2]:=2
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https://wolfram.com/xid/0n4lxderpgi-xyrs1i
Out[2]=2
Wolfram Research (1991), ToLowerCase, Wolfram Language function, https://reference.wolfram.com/language/ref/ToLowerCase.html (updated 1996).
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Wolfram Research (1991), ToLowerCase, Wolfram Language function, https://reference.wolfram.com/language/ref/ToLowerCase.html (updated 1996).

Text

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

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

CMS

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

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

APA

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

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

BibTeX

@misc{reference.wolfram_2025_tolowercase, author="Wolfram Research", title="{ToLowerCase}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/ToLowerCase.html}", note=[Accessed: 03-May-2025 ]}

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@misc{reference.wolfram_2025_tolowercase, author="Wolfram Research", title="{ToLowerCase}", year="1996", howpublished="\url{https://reference.wolfram.com/language/ref/ToLowerCase.html}", note=[Accessed: 03-May-2025 ]}

BibLaTeX

@online{reference.wolfram_2025_tolowercase, organization={Wolfram Research}, title={ToLowerCase}, year={1996}, url={https://reference.wolfram.com/language/ref/ToLowerCase.html}, note=[Accessed: 03-May-2025 ]}

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@online{reference.wolfram_2025_tolowercase, organization={Wolfram Research}, title={ToLowerCase}, year={1996}, url={https://reference.wolfram.com/language/ref/ToLowerCase.html}, note=[Accessed: 03-May-2025 ]}