snake_case Converter — Convert Text to snake_case Online
Convert phrases, titles, or sentences to snake_case format. Replaces spaces and punctuation with underscores and lowercases all characters. Standard for Python variables and SQL columns.
Key Features
Converts camelCase, PascalCase, kebab-case, or titles to clean snake_case
Replaces spaces, hyphens, and punctuation symbols with single underscores
Transforms all characters to lowercase
Option for UPPER_SNAKE_CASE (screaming snake case) for constants and config flags
How to Use
Paste your variable names, sentence, or column headers into the box.
Select snake_case or SCREAMING_SNAKE_CASE mode.
Click "Convert to snake_case" to generate the identifiers.
Inspect the formatted identifiers in the output area.
Copy the resulting text directly to your clipboard.
Example
Sample input
UserProfileId
Sample output
user_profile_id
Edge Cases
Consecutive capitals (HTTPResponse)
Hyphens and spaces as word breaks
Trailing underscores trimmed
Frequently Asked Questions
Where is snake_case commonly used in programming?
Snake case is the official naming convention for Python variables and functions (PEP 8), Ruby methods, SQL database column names, and C variables.
Can this convert camelCase words with numbers (e.g. item2Count)?
Yes. Word transitions and number boundaries are detected cleanly, turning "item2Count" into "item_2_count" or "item2_count".
How does this tool handle multiple consecutive spaces or symbols?
Consecutive spaces, dashes, or punctuation marks are collapsed into a single underscore to prevent double underscores like "__".
Privacy notice: when you run this tool, your input is sent over HTTPS to our server, processed in memory and returned. It is not stored or logged. Avoid pasting live secrets such as private keys or passwords.