Convert lowercase to UPPERCASE
Turn lowercase text into ALL CAPS instantly — free, as you type, nothing uploaded. Headlines, constant names, shipping labels and form requirements.
This converter turns every small letter into its capital form while leaving everything else untouched. It is the tool for house styles that demand caps: newspaper headlines, mailing-address blocks, engraved plaques, form fields that require uppercase, or code constants written in SCREAMING_SNAKE_CASE.
Conversion happens as you type, entirely in your browser — nothing is uploaded, so confidential text stays on your device. The style menu also gives you the reverse (uppercase to lowercase), Title Case for headlines that should not be fully shouted, and every other case style in one place.
If the target is code constants rather than prose, snake_case and kebab-case sit in the same menu: "http status code" becomes HTTP_STATUS_CODE or http-status-code with one click, using the same word splitter that powers the rest of the converter.
Frequently asked questions
- Will it uppercase text after quotation marks or parentheses?
- Uppercase mode capitalises every letter uniformly — it is a pure case flip, not a grammar pass. For capitalising only the first letter of each word or sentence, use Title Case or Sentence case from the menu.
- Does it work with accented characters?
- Yes — letters beyond A–Z (é, ü, ñ and the rest of Latin-1 and beyond) uppercase too, using the browser's own Unicode case rules.
- Is there a length limit?
- Only your browser's memory. The conversion is instant for typical documents and runs locally, so long text costs nothing but a moment of typing latency.