Case Converter — Uppercase, Title Case & camelCase

How to use this tool

1. Paste the text you want to convert, or load the example.
2. Choose one of the seven letter-case styles.
3. Choose Transform text, review names and abbreviations, then copy or download the result.

Convert a label to snake_case: example

Input

HTTPResponse Label

Result

http_response_label

Choose a case for the destination

Paste a heading, sentence or label, select a letter case and choose Transform text. Uppercase and lowercase keep punctuation and whitespace while changing the case of letters. Title Case capitalizes the beginning of each recognized word and lowercases the rest. Sentence case lowercases the text, then capitalizes the first letter at the beginning and after a period, question mark or exclamation mark followed by whitespace. These are mechanical transformations for drafts and labels. They do not interpret meaning, enforce a publication style guide or reliably preserve proper names and abbreviations. Check the result before using it in a title or finished document.

How identifier-style output is built

camelCase, snake_case and kebab-case first split the input into letter-and-number groups. Spaces and punctuation become boundaries; existing underscores and hyphens are replaced by the chosen output style. Lowercase-to-uppercase transitions split words, while an uppercase acronym followed by a mixed-case word gets its own boundary. For example, HTTPResponse becomes httpResponse, http_response or http-response. Numbers are retained, and a lowercase-or-number to uppercase transition creates a boundary, so request2D becomes request2_d in snake case. Identifier styles remove punctuation and emoji rather than encoding them. They can produce an empty result when the input contains no letters or numbers.

Unicode support and language limits

The implementation recognizes Unicode letter, number and combining-mark categories. Romanian letters such as ș and ț, accented words such as café and many non-Latin scripts are retained. Ordinary case conversion uses JavaScript’s locale-independent Unicode mappings. This is not Turkish-specific casing, transliteration or accent removal, and a case change can expand one character into several. Combining marks stay with their word, but the tool does not normalize composed and decomposed spellings. Word boundaries are based on character groups rather than a language dictionary: text without spaces is not segmented into linguistic words. Title Case keeps interior apostrophes within a word, so DON’T becomes Don’t.

Review, copy and reuse the result

Title Case capitalizes all recognized words rather than applying editorial exceptions for articles, conjunctions or prepositions. Sentence case uses punctuation as a heuristic, so abbreviations, initials, names and code can require manual corrections. Identifier output may start with a digit or contain non-ASCII letters; it is not a validator for any programming language, database identifier, URL slug or filename policy. Input is limited to 200,000 UTF-16 characters. A new selection or edit clears the old result, and the source remains in its field until you clear it. Copy result uses the clipboard on request; Download result creates a UTF-8 text file. No account, API call or text upload is needed.