Paste your text and switch to the case you need with one click. The result stays in the editor, ready for any final adjustments.
Inconsistent capitalization appears easily when material comes from spreadsheets, several source documents, or an accidentally enabled Caps Lock key. A case converter gives that text a consistent shape without correcting every word by hand.
Beyond paragraphs, the tool can prepare headings, lists, filenames, and technical identifiers. The first six modes preserve spacing and punctuation. The developer formats instead break content into words and rebuild it with a defined separator or no spaces at all.
If you need to measure length instead of changing capitalization, use the word and character counter.
Each mode solves a different formatting problem. In the examples, the source is shown on the left and its result on the right.
First makes everything lowercase, then capitalizes the first letter at the beginning, after sentence-ending punctuation, and after a line break.
hELLO WORLD. A NEW SENTENCE! → Hello world. A new sentence!
Changes every letter to lowercase while leaving numbers, spaces, and punctuation untouched.
Hello ZÜRICH → hello zürich
Capitalizes every letter, which is useful for short labels or lines that deliberately need strong emphasis.
Hello Zürich → HELLO ZÜRICH
Capitalizes the first letter of each word and changes the remaining letters in every word to lowercase.
a NEW heading → A New Heading
Alternates lowercase and uppercase across all letters. Numbers and punctuation are skipped without restarting the pattern.
Online Toolkit → oNlInE tOoLkIt
Swaps the current case of every letter: uppercase becomes lowercase, and lowercase becomes uppercase.
Hello ZÜRICH → hELLO zürich
Starts with a lowercase word and attaches later words with an uppercase initial and no separator. It is common for variable names.
my new value → myNewValue
Joins words without separators and begins every one with an uppercase letter. Class and type names often use this style.
my new value → MyNewValue
Lowercases each word and connects them with underscores. The result works well for technical keys and filenames.
My new value → my_new_value
Lowercases each word and separates them with hyphens. This style is widely used for URL paths and CSS classes.
My new value → my-new-value
No. Conversion, statistics, copying, and file creation all run on your device. The text is neither transmitted to OnlineToolkit.ch nor saved in browser storage.
Sentence case first makes the text lowercase and then capitalizes the first letter of each recognized sentence. A sentence starts at the beginning, after a period, exclamation mark, or question mark followed by whitespace, and on every new line.
Both styles remove separators and capitalize later words. camelCase keeps the beginning of the first word lowercase, while PascalCase starts the first word with an uppercase letter too.
The tool imposes no fixed limit. In practice, only your device’s available memory matters. Ordinary long documents should convert immediately, although exceptionally large input may take a moment on older hardware.
Sentence, lowercase, uppercase, capitalized, alternating, and inverse modes keep them in place. camelCase, PascalCase, snake_case, and kebab-case treat punctuation and whitespace as word boundaries and build a new identifier.