How does this snake case converter change the text?

Words become lowercase and an underscore separates each pair. For example, helloWorld becomes hello_world.

How does this compare with other case styles?

snake_case separates words with underscores. CONSTANT_CASE uses the same separator with capitals; choose that result if you are naming a constant.

Does it understand names, acronyms or programming syntax?

It splits on spaces, underscores, hyphens, dots, slashes and lowercase-to-uppercase boundaries. It does not parse source code or infer acronym boundaries: XMLParser is treated as one word. Review identifiers before using them in a program.

No. Conversion and copying happen in this browser. Nothing is sent to a conversion server.

Snake Case Converter

Words become lowercase and an underscore separates each pair. This page opens with helloWorld and its hello_world result first. Replace the example with your own text, then copy the highlighted conversion. The other case styles stay available for comparison.

Your text10 characters

snake_casethis page’s casePython, SQL columns
hello_world
Sentence caseFirst word capitalised
Helloworld
Title CaseEditorial rules: small words stay lower
Helloworld
UPPER CASE
HELLOWORLD
lower case
helloworld
camelCaseVariables in JS, Java
helloWorld
PascalCaseClasses, components
HelloWorld
CONSTANT_CASEEnvironment variables
HELLO_WORLD
kebab-caseURLs, CSS classes, filenames
hello-world
dot.caseConfig keys, namespaces
hello.world
aLtErNaTiNg
hElLoWoRlD
iNVERSESwaps each letter's case
HELLOwORLD

Common questions

How does this snake case converter change the text?: Words become lowercase and an underscore separates each pair. For example, helloWorld becomes hello_world.
How does this compare with other case styles?: snake_case separates words with underscores. CONSTANT_CASE uses the same separator with capitals; choose that result if you are naming a constant.
Does it understand names, acronyms or programming syntax?: It splits on spaces, underscores, hyphens, dots, slashes and lowercase-to-uppercase boundaries. It does not parse source code or infer acronym boundaries: XMLParser is treated as one word. Review identifiers before using them in a program.
Is my text uploaded?: No. Conversion and copying happen in this browser. Nothing is sent to a conversion server.

Exact, and Unicode-aware: casing follows the Unicode rules rather than ASCII, so accented letters, Greek final sigma and the Turkish dotless i convert correctly. Title case applies English conventions for small words, which is a style choice rather than a standard.