Convert text case
Paste your text and switch it to UPPERCASE, lowercase, Title Case, Sentence case or programming styles like camelCase, snake_case and kebab-case in one click. Everything runs in your browser, and you can copy the result instantly.
How to use Case Converter
- 1
Paste your text
Type or paste the text you want to reformat into the input box.
- 2
Choose a case
Click UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case or kebab-case.
- 3
See the result
The converted text appears instantly, with your original meaning preserved.
- 4
Copy it
Copy the result with one click and paste it wherever you need it.
Every case style in one place
Changing the capitalization of text by hand is slow and error-prone, especially for anything longer than a sentence. A case converter does it instantly. In1 brings the most useful styles together so you never have to retype a word: UPPERCASE for emphasis and headings, lowercase for normalizing messy input, Title Case for headlines and titles, and Sentence case for turning a shouty block of text back into something readable. On top of those everyday styles it also handles the conventions programmers rely on — camelCase, snake_case and kebab-case — which are tedious to produce manually. You paste your text once and switch between styles with a single click, seeing the result immediately. Whether you accidentally left Caps Lock on, pasted a heading that came through in all capitals, or need to reformat a list of labels, the right transformation is one tap away instead of a frustrating manual rewrite.
Fix text that came out wrong
So much text arrives in the wrong case. You paste a title from a PDF and it is in ALL CAPS. You copy a sentence and the formatting mangles the capitalization. Someone sends a message typed entirely in lowercase that needs tidying before you forward it. Retyping is a waste of time, and manual editing introduces typos. A case converter fixes all of this in seconds: drop the text in, choose the case you want, and copy the corrected version straight back out. Sentence case is particularly handy for rescuing a wall of capitals into normal prose, while Title Case instantly smartens up a heading that came through flat. Because the conversion is deterministic and instant, you can clean up anything from a single label to a long document without touching the keyboard, and the original meaning is preserved — only the capitalization changes. That makes it a reliable cleanup step you can trust before publishing or sharing.
Built for writers and developers alike
The tool serves two audiences at once. Writers, editors, students and marketers lean on UPPERCASE, lowercase, Title Case and Sentence case to format headlines, clean up pasted text, normalize data and follow a style guide consistently. Developers and technical users reach for camelCase, snake_case and kebab-case constantly: variable and function names, database columns, JSON keys, CSS classes, file names, URL slugs and environment variables all follow one of these conventions. Producing them by hand — capitalizing the right letters, swapping spaces for underscores or hyphens — is fiddly and easy to get wrong. Here you type or paste a phrase in plain words and instantly get the exact identifier style you need. Having both the human styles and the code styles side by side means the same tool works whether you are polishing a blog headline or renaming a batch of variables to match your project's conventions — no context-switching to a second utility just to change capitalization.
Private and instant — nothing is uploaded
Your text can be sensitive: an unpublished draft, internal naming, a private message, or data you would rather not share. In1 converts everything locally in your browser using plain JavaScript, so not a single character is sent to a server. There is no upload, no storage and no account to create. The conversion happens the instant you click, even on a long document, because there is no network round trip — and it works exactly the same whether you are online or offline. This local-only approach is both a privacy feature and a speed feature: you can safely paste real content, transform it however you like, and copy the result, confident that the text never left your device. When you close the tab, nothing remains, which makes it a safe place to reformat anything from a confidential paragraph to a list of internal identifiers.
How the case styles work
Each style follows a clear rule. UPPERCASE makes every letter capital; lowercase makes every letter small. Title Case capitalizes the first letter of each word, which suits headings and names. Sentence case capitalizes only the first letter of each sentence and lowercases the rest, turning shouted text back into normal prose. The programming styles remove the spaces between words and join them: camelCase lowercases the first word and capitalizes each following word with no separators (myVariableName); snake_case lowercases everything and joins words with underscores (my_variable_name); and kebab-case does the same but joins with hyphens (my-variable-name), which is the standard for URL slugs and CSS classes. Because you can flip between all of them on the same input, it is easy to compare and grab exactly the format a particular destination expects — a headline, a sentence, or a code identifier — without memorizing any of the rules yourself. A handy workflow is to type a name in plain words once and then sample each style in turn: the same phrase can become a Title Case heading, a snake_case database column and a kebab-case URL slug in a few clicks, with no risk of a mistyped capital or a missed separator along the way.
Higher limits, batch processing and an API are on the way. Want early access?