String Operations Tool
What It Does
Converts your text to the selected case style instantly.
How to Use
- Paste or type your text in the input area.
- Select the desired case from the sidebar (UPPERCASE, lowercase, Title Case, Sentence case, Capitalize Each Word).
- Click the convert button.
- The converted text appears in the output area.
- Click “Copy” to copy the result to your clipboard.
Options Explained
| Option | Description |
|---|---|
| UPPERCASE | Every letter becomes uppercase (A–Z) |
| lowercase | Every letter becomes lowercase (a–z) |
| Title Case | First letter of each major word is capitalized |
| Sentence case | First letter of each sentence is capitalized |
| Capitalize Each Word | First letter of every word is capitalized |
Example
Input: hello world. how are you? i am fine! → Sentence case → Hello world. How are you? I am fine!
About Converting Text to Sentence case
Sentence case capitalizes only the first letter of each sentence and leaves the rest of the words lowercase, exactly the way you write ordinary prose. It is the most natural, readable style for body text, UI labels, notifications, and modern headings that favor a calm, non-shouty tone. The converter detects sentence boundaries after periods, question marks, and exclamation points.
Before and After
Input: hello world. how are you? i am fine!
Output: Hello world. How are you? I am fine!
Common Use Cases
- Body copy and prose — Fix text that was accidentally typed in caps lock back into readable sentences.
- UI labels and buttons — Match the sentence-case style recommended by many modern design systems for interface text.
- Notifications and messages — Format alerts and toast messages in a friendly, conversational tone.
Frequently Asked Questions
How does the tool detect a new sentence?
It capitalizes the first letter after sentence-ending punctuation — a period, question mark, or exclamation point — as well as the very first character of the text.
Does Sentence case fix proper nouns?
No. It only adjusts the first letter of each sentence. Names and other proper nouns in the middle of a sentence keep whatever casing you typed.
What happens to text with no punctuation?
The whole input is treated as one sentence, so only the first letter is capitalized and everything else becomes lowercase.
Privacy
This tool processes your text entirely in your browser using JavaScript. No data is sent to any server, stored, or logged. Your text remains on your device at all times.