Uppercase / Lowercase

Convert text to uppercase, lowercase, title case or sentence case

What is it and how does it work?

A case converter rewrites text by changing which letters are capitalised, without altering the words themselves. The four cases people need most are different in subtle ways: UPPERCASE makes every letter a capital, lowercase removes all capitals, Sentence case capitalises only the first letter of each sentence, and Title Case capitalises the first letter of each significant word. They look trivial until you try to do them by hand on a long block of text — fixing a heading you accidentally typed with Caps Lock on, or normalising a list of names that arrived in inconsistent casing.

What makes this harder than it appears is that title and sentence case depend on language rules, not just position. Real title case keeps short words like "of", "and" or "the" lowercase unless they start the phrase, and sentence case has to find sentence boundaries — the period after "Dr." is not the end of a sentence. This tool applies sensible defaults so you get a clean result in one click, then lets you copy it straight back into your document, code or spreadsheet.

Common use cases

• Cleaning up imported data: a CSV of customer names arrives as "JOHN SMITH" and "mary jones" — convert the whole column to Title Case so it reads consistently.
• Fixing a Caps Lock accident: you typed a whole paragraph with Caps Lock on; switch it to Sentence case instead of retyping it.
• Formatting headings and titles: paste a draft headline and apply Title Case to match a style guide before publishing.

Frequently asked questions

What is the difference between title case and sentence case?

Title case capitalises the first letter of every important word (Common Use Cases), used for headlines and titles. Sentence case capitalises only the first word and proper nouns (Common use cases), used for normal prose. Title case is for labels; sentence case is for reading.

Does converting to uppercase lose any information?

For most text, yes — capitalisation is discarded, so converting "iPhone" to "IPHONE" and back will not restore the original mixed case. Keep a copy of the original if the exact casing matters. Lowercasing has the same one-way effect.

Why does CSS text-transform not do the same thing?

CSS text-transform: uppercase only changes how text is displayed; the underlying characters are unchanged, so copying the text gives you the original casing. This tool transforms the actual characters, so the new casing travels with the text wherever you paste it.

How does title case handle small words like "of" and "the"?

It keeps common articles, conjunctions and short prepositions lowercase when they fall in the middle of the title, but capitalises them when they are the first word. This follows the convention used by most English style guides for clean, readable headings.

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