Quick answer: paste your text into the converter above and press lowercase. Every capital letter becomes lowercase and everything else, including numbers, punctuation and line breaks, stays exactly where it was. The other buttons switch the same text to UPPERCASE, Title Case or Sentence case.
Most case problems come from one of three places: a paragraph typed with Caps Lock on, text pasted from a system that stores everything in capitals (old databases, legal documents, shipping labels), or headings written by several people who each capitalized differently. Retyping is the slow fix. Converting takes one click, as long as you know what each mode will and will not do.
What each button does
lowercase and UPPERCASE
These change letters only. Order #A-1042 SHIPPED becomes order #a-1042 shipped. They work on accented letters and on other alphabets that have capitals, such as Greek and Cyrillic, using your browser's built-in rules.
Lowercase is the right first step when cleaning up data for comparison. Email addresses, usernames and tags often arrive with inconsistent capitals, and lowercasing them before you remove duplicates or sort the list stops Anna@Example.com and anna@example.com being treated as different entries.
Sentence case
Lowercases everything, then capitalizes the first letter of the text and the first letter after each full stop, question mark or exclamation mark. The word "I" on its own is capitalized as well. This is the mode to use on text typed with Caps Lock on.
It cannot know which words are names. WE MET ANNA IN PARIS. becomes We met anna in paris., so read the result and fix proper nouns, acronyms and brand names by hand. Abbreviations with full stops, like "e.g.", will also capitalize the word after them.
Title Case
Capitalizes every word except short articles, conjunctions and prepositions (a, an, the, and, but, or, for, at, by, in, of, on, to and a few others). Those stay lowercase unless they are the first or last word, or follow a colon. a guide to the best tools for writers becomes A Guide to the Best Tools for Writers.
Style guides disagree on the details, so check which one you are following. The APA rule is to capitalize every word of four letters or more, so "Over", "With" and "From" get capitals. Chicago style lowercases prepositions of any length, so "over", "with" and "from" do not. This converter capitalizes longer prepositions, which matches APA. For Chicago, lowercase them by hand afterwards.
camelCase, snake_case, kebab-case and PascalCase
These turn text into names for code: first name becomes firstName, first_name, first-name or FirstName. They remove spaces and punctuation and convert each line separately. The camelCase to snake_case guide explains how word boundaries are detected and which languages use which style.
Things to check after converting
- Proper nouns and acronyms. Lowercase and Sentence case turn NASA into nasa and London into london.
- Code, URLs and passwords. These are often case-sensitive, so
README.mdandreadme.mdcan be different files. Convert the prose around them, not the values themselves. - Headings in a title style. If a publisher specifies AP, Chicago or APA, spot-check prepositions and words after hyphens.
Doing it in other programs
- Microsoft Word: select the text and press Shift+F3 to cycle through lowercase, UPPERCASE and capitalize-each-word. Home > Change Case has more options, including Sentence case.
- Google Docs: Format > Text > Capitalization offers lowercase, UPPERCASE and Title Case.
- Excel and Google Sheets:
=LOWER(A1),=UPPER(A1)and=PROPER(A1). PROPER capitalizes every word, including "and" and "the". - Code:
text.toLowerCase()in JavaScript,text.lower()in Python.
Convert your text
lowercase, UPPERCASE, Title Case, Sentence case and code styles. Nothing is uploaded.
↑ Back to the converterFrequently asked questions
Does converting to lowercase change anything else?
No. Only capital letters change. Numbers, punctuation, spaces and line breaks are left exactly as they were.
How do I fix text typed with Caps Lock on?
Paste it in and press Sentence case. Each sentence gets a capital first letter and everything else becomes lowercase. Then restore capitals on names and acronyms by hand.
What is the difference between Title Case and Sentence case?
Title Case capitalizes most words and suits headlines and book titles. Sentence case capitalizes only the first word of each sentence and suits body text, captions and many website headings.
Which words stay lowercase in Title Case?
Short articles, conjunctions and prepositions such as a, the, and, of, in and to, unless they start or end the title or follow a colon. Longer prepositions like over and with are capitalized, which matches APA style.
Is my text uploaded anywhere?
No. Conversion happens in your browser, so the text never leaves your device.