Convert text to UPPERCASE
Paste or type your text and convert it to UPPERCASE with one click. It runs entirely in your browser, so nothing is uploaded — just copy the result when you're done.
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How to convert text to UPPERCASE
- Paste or type your text into the box above — it stays in your browser and is never sent anywhere.
- Press the UPPERCASE button to transform the text instantly.
- Copy the result, or keep transforming with the other case buttons.
About UPPERCASE
Converting text to UPPERCASE reformats your words without changing their meaning — handy for headings, code, data and tidying up pasted text.
Everything runs locally in your browser, with no upload, no limit and no sign-up, and you can chain conversions on the same text.
UPPERCASE forces every letter to its capital form, which is why it's the go-to for code constants like MAX_SIZE and TIMEOUT_MS, acronyms such as HTTP and JSON, and tightly-scoped emphasis like a warning label or a CTA button. Reach for it when you need a value to read as a fixed token or a single word to stand out, but avoid running whole sentences or paragraphs through it: all-caps body text is measurably slower to read and online it tends to come across as shouting.
Frequently asked questions
How do I convert text to UPPERCASE?
Paste your text into the box and press the UPPERCASE button. The text is converted instantly and you can copy it — all in your browser.
Is my text uploaded anywhere?
No. The conversion happens entirely in your browser, so your text never leaves your device and nothing is stored online.
Can I switch to another case?
Yes. The other options (UPPERCASE, lowercase, Title Case, Sentence case and more) are right there, so you can transform the same text again.
Is there a limit on how much text I can convert?
No. You can convert as much text as you like — it runs locally and instantly, with no sign-up.
Does UPPERCASE change anything besides the letters, like spaces or underscores?
No — it only raises letters to their capital form and leaves spaces, digits, underscores and punctuation untouched, so an identifier like max_size becomes MAX_SIZE rather than collapsing the underscore. If you also need words joined with underscores, use the snake_case tool instead.