Text Case Converter
This text case converter changes the letter case of any text in real time. Paste or type your words and instantly get four versions at once: all UPPERCASE, all lowercase, Title Case (the first letter of each word capitalized) and Sentence case (only the first letter of each sentence capitalized). Every result has its own copy button, so you can grab exactly the format you need for a heading, a filename, a spreadsheet cell or a social post without retyping anything.
UPPERCASE
lowercase
Title Case
Sentence case
The conversion is instant and happens in your browser: your text is never sent to any server.
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How it works
UPPERCASE turns every letter into a capital letter, while lowercase does the opposite. Title Case capitalizes the first letter of every word and lowercases the rest, which is handy for titles and headings. Sentence case capitalizes only the first letter of each sentence — the first character of the text and the first letter after every period, question mark or exclamation mark — leaving the rest as lowercase, just like normal prose. All of the work happens in your browser as you type, so nothing is uploaded and the conversion is immediate.
Conversion modes with examples
Each mode transforms the same text in a different way. This table shows what happens to the phrase "hello world" depending on the format you pick:
| Mode | What it does | Example: "hello world" |
|---|---|---|
| UPPERCASE | Turns every letter into a capital | HELLO WORLD |
| lowercase | Turns every letter into a small letter | hello world |
| Title Case | Capitalizes the first letter of each word | Hello World |
| Sentence case | Capitalizes only the first letter of the sentence | Hello world |
Common uses for the case converter
Changing the case of a text by hand is tedious and error-prone. This converter is handy for cleaning up text pasted from a PDF or an email that arrived all in UPPERCASE, normalizing names and email addresses before loading them into a spreadsheet or database, formatting titles and headings with Title Case, or fixing in one go a paragraph you typed by accident with Caps Lock on. Because it runs in your browser in real time, you can try all four formats and keep the one that fits best without retyping anything.
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Preguntas frecuentes
- What is the difference between Title Case and Sentence case?
- Title Case capitalizes the first letter of every word ("The Quick Brown Fox"), which is typical for titles and headings. Sentence case capitalizes only the first letter of each sentence and leaves everything else lowercase ("The quick brown fox"), just like ordinary writing.
- Is my text sent to a server?
- No. All four conversions run entirely in your browser using JavaScript. Your text never leaves your device and nothing is stored or uploaded, so it is safe to use with private or sensitive content.
- Does it work with accents and non-English characters?
- Yes. The converter uses Unicode-aware casing, so accented letters and characters from many languages (á, ñ, ü, ç, ß and more) are converted correctly to their upper or lower forms.
- How do I copy a result?
- Each of the four versions has its own Copy button. Click it and that version is placed on your clipboard; the button briefly shows a confirmation so you know the copy succeeded. Then paste it wherever you need.
- Why does Sentence case sometimes capitalize a letter mid-line?
- Sentence case capitalizes the first letter after every sentence-ending mark — a period, question mark or exclamation mark. If your text contains those punctuation marks, the next letter is treated as the start of a new sentence and capitalized.