Free Online Text Conversion Tool
Using the lowercase converter tool is very simple:
Lowercase conversion is used in the following cases:
In many programming languages, variable and function names are written in camelCase or snake_case, but in some cases they are unified with only lowercase letters. For example, converting "UserName" to "username" or "GET_USER_DATA" to "get_user_data".
It is common to unify filenames and URL slugs on websites with lowercase letters. It is also recommended from an SEO perspective. For example, converting "MyPhoto.JPG" to "myphoto.jpg" or "About-Us.html" to "about-us.html".
Email addresses do not distinguish between uppercase and lowercase letters as standard, but it is common to unify them with lowercase when storing in a database. You can unify "User@Example.COM" to "user@example.com".
In data analysis and database operations, unifying text data with lowercase letters improves search and matching accuracy. For example, unifying "Apple", "APPLE", and "apple" to "apple" can remove duplicates.
In HTML5, it is recommended to write tag and property names in lowercase letters. It can be used to convert old HTML tags with uppercase letters (<DIV>, <TABLE>) to lowercase (<div>, <table>).
Before performing string comparison, you can convert both texts to lowercase for case-insensitive comparison. Useful for implementing search functions.
Lowercase refers to the small forms of alphabet letters (a, b, c...z). In English, they are called "lower case" and are a concept opposite to uppercase (uppercase / capital letters).
Lowercase originated from the Carolingian minuscule of the ancient Roman era. In the printing era, lowercase letters were placed in the lower part (lower case) of the type storage box, and uppercase letters in the upper part (upper case), hence the name.
a b c d e f g h i j k l m n o p q r s t u v w x y z (26 letters)
Lowercase a to z are assigned 97 to 122 in ASCII, U+0061 to U+007A in Unicode. In programming, conversion between uppercase and lowercase is performed by manipulating character codes.
In most programming languages, the toLowerCase method or lower method is used to convert strings to lowercase. Internally, the Unicode code points of each character are converted to the lowercase range.
Even large amounts of text can be instantly converted to lowercase with a single click. There is no need to manually correct each character, and work efficiency is greatly improved.
In databases and programs, unifying text data with lowercase letters facilitates search, sort, and comparison operations and enables consistent data management.
Unifying URLs, filenames, and slugs with lowercase letters is an SEO best practice. Search engines may distinguish between uppercase and lowercase, so unifying with lowercase avoids duplicate content issues.
In coding standards of many programming languages, it is recommended to write variable, function, and package names in lowercase (or camelCase, snake_case). This improves code readability and maintainability.
The conversion process is completed entirely in the browser, so there is no need to send data to the server. Texts containing confidential information can be converted safely.
This tool converts only English letters (A-Z) to lowercase (a-z). Other languages such as Japanese, Chinese, Korean, as well as numbers and symbols remain unchanged.
Letters with diacritical marks (é, ñ, ü, etc.), numbers (0-9), and symbols (!@#$%, etc.) are not subject to conversion. Adjust them manually if necessary.
Some special Unicode characters do not have the concept of uppercase and lowercase letters. Also, some languages have their own uppercase and lowercase rules (such as İ/i in Turkish).
When converting to lowercase, the original uppercase information is lost. When converting important documents, always keep a backup of the original text.
This online tool supports up to 10,000 characters. For converting larger files, use string processing functions in programming languages or batch replacement functions in text editors.
No, languages such as Japanese, Chinese, and Korean do not have the concept of uppercase and lowercase letters, so they are not converted and remain unchanged. Only English letters are converted (A-Z → a-z).
Numbers (0-9), symbols (!@#$%, etc.), spaces, and newlines all remain unchanged. Only English uppercase letters (A-Z) are converted.
This tool cannot return the text. When converting to lowercase, information about which characters were originally uppercase is lost. Always save a copy of the original text before conversion.
In programming, in addition to conversion to lowercase, there are naming conventions such as camelCase, snake_case, and kebab-case. Use specialized tools for these conversions.
This tool performs processing entirely in the browser and does not send data to the server. However, for extremely confidential data, it is recommended to use local tools or programming language functions (e.g., toLowerCase() in JavaScript).
Unifying URLs and filenames with lowercase prevents duplicates and errors due to letter differences. Also, some servers and systems distinguish between uppercase and lowercase, so unifying with lowercase improves cross-platform compatibility.
Yes, it is possible. When pasting old HTML tags with uppercase letters (<DIV>, <TABLE>, etc.), they will be converted to lowercase (<div>, <table>, etc.). In HTML5, lowercase tags are recommended.
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