Lowercase / small letters / minuscule text
All lowercase text is mostly used for artistic purposes (like poetry) and when it's inconvenient to use capitals (like SMS). All lowercase text is usually better readable than all caps text.
Conversion tool
Programming conversion to lowercase
JavaScript
var str = 'Test';
var result = str.toLowerCase();
Microsoft Excel
=LOWER(A2)
You can also use Flash Fill to convert your fields.
MySQL
SELECT LOWER(firstname) FROM Clients
Perl
my $str = 'Test';
print lc($str);
PHP
$str = 'Test';
print strtolower($str);
Python
s = 'Test'
print s.lower()
For non-Latin characters:
print s.decode('utf-8').lower()