Convert text to snake_case

This tool converts any given text into snake_case. It provides flexible options so you can choose the conversion method that best fits your needs. Whether you need a strict conversion (removing punctuation and collapsing non‑alphanumeric characters), a version that only replaces whitespace while preserving punctuation, a conversion for CamelCase strings, or one that uses a custom delimiter, this tool has you covered.

Input

snake_case Output

Conversion Options:

Basic Conversion
Converts the entire text to lower case, replaces any sequence of non‑alphanumeric characters with a single underscore, and trims underscores from the ends.

Preserve Punctuation
Converts the text to lower case and replaces whitespace with underscores while preserving punctuation and other symbols.

CamelCase Conversion
Inserts underscores between lower and uppercase boundaries in CamelCase strings and converts the result to lower case.

Custom Delimiter
Replaces whitespace with a custom delimiter of your choice (instead of the standard underscore). Enter the delimiter text below.

Examples:

Basic Conversion

Converts "Hello, World! This is a Test." to snake_case.

Before:

Hello, World! This is a Test.

After:

hello_world_this_is_a_test

Preserve Punctuation

Converts "Hello, World! This is a Test." by replacing spaces with underscores while keeping punctuation intact.

Before:

Hello, World! This is a Test.

After:

hello,_world!_this_is_a_test.

CamelCase Conversion

Converts "ThisIsATestString" to snake_case.

Before:

ThisIsATestString

After:

this_is_a_test_string

Custom Delimiter

Converts "Hello World" to snake_case using a custom delimiter (e.g., "->").

Before:

Hello World

After (using "->"):

hello->world