Snake Case Converter
Convert text or camelCase to snake_case instantly.
How to use this tool
- Enter text in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your snake_case and the full breakdown beneath it.
Convert text or camelCase to snake_case instantly.
How it works
Snake case is a naming convention where words are separated by underscores and all letters are lowercase, like user_first_name or max_retry_count. It is widely used in Python variable names, database column names, JSON keys, and file names across many projects.
This converter accepts plain text phrases, camelCase identifiers, PascalCase identifiers, and kebab-case strings, then transforms them into properly formatted snake_case. It splits on spaces, hyphens, and existing camel-case word boundaries before joining everything with underscores.
Paste or type your identifier into the input field. The tool produces the snake_case version instantly. You can then copy it directly into your code, schema, or config file without risk of typing errors.
Use this tool when renaming API response fields before storing them in a database, refactoring code from a different naming convention, or following a style guide that mandates snake_case throughout a project.
Worked examples
Convert a camelCase variable to snake_case
- Type or paste the identifier: 'getUserFirstName'
- The tool detects camelCase word boundaries (get, User, First, Name).
- It lowercases every segment and joins them with underscores.
- Output: 'get_user_first_name'
get_user_first_name -- ready to paste into Python or SQL.
Convert a plain English phrase
- Enter: 'Maximum Retry Count'
- Words are split on spaces and lowercased.
- Output: 'maximum_retry_count'
maximum_retry_count
Common mistakes to avoid
- Pasting a full sentence with punctuation -- commas and periods may appear in the output. Strip punctuation first or use only the specific identifier.
- Expecting the tool to preserve intentional all-caps acronyms -- 'URL' becomes 'url' since snake_case is all-lowercase by convention.
- Forgetting to remove leading or trailing spaces before pasting, which can produce a leading underscore in the result.
Key terms
- Snake case
- A naming style that uses lowercase letters and underscores to separate words, e.g. first_name.
- CamelCase
- A naming style where each word starts with a capital letter with no separators, e.g. firstName or FirstName.
- Identifier
- A name given to a variable, function, column, or other code element.
Frequently asked questions
- Does it handle camelCase input?
- Yes — camelCase is split on uppercase letters before conversion.