Case Converter

About this Case Converter

The Case Converter changes capitalization without altering the basic wording of your text. It can normalize pasted text, prepare headings, fix all-caps content or quickly convert a draft into a more readable capitalization style.

Correcting text case is one of the most frequently needed small text edits, and doing it manually by retyping is both slow and prone to introducing new typos.

For related tasks, try Text Reverser, Slug Generator or Find & Replace Text.

How to use it

1. Paste or type the text.
2. Choose the capitalization style you want.
3. Copy the converted text from the same box.

Practical example

“hello from DEKUZ” becomes “HELLO FROM DEKUZ” in uppercase, “hello from dekuz” in lowercase and “Hello From Dekuz” in title case.

Converting the QUICK brown Fox to sentence case produces The quick brown fox, capitalizing only the first letter of the sentence and lowercasing everything else, regardless of the original text's inconsistent capitalization.

Things to double-check

Title case rules for capitalizing headings vary between different style guides, with some capitalizing every word and others leaving certain short words in lowercase unless they start the title, so an automatic title-case conversion may not perfectly match every publication's house style.

The four cases

The converter changes text to uppercase, lowercase, title case or sentence case. Uppercase and lowercase change every letter. Title case capitalises the first letter of each word, and sentence case capitalises only the first letter of each sentence. For example, the quick brown fox becomes The Quick Brown Fox in title case and The quick brown fox in sentence case. It is the quickest way to fix text typed with Caps Lock on.

Title case rules

Style guides disagree on title case. Many leave short words such as a, an, the, of, in and to in lowercase unless they begin or end the title, while others capitalise every word. A simple converter capitalises every word, so check small words and your preferred style afterwards. Capitalise the first and last word, nouns, verbs and adjectives. Headlines in news often use sentence case instead, which many readers find easier to scan.

Names, acronyms and special words

Automatic conversion cannot know which words have special capitalisation. Names such as McDonald, brand names like iPhone, and acronyms such as NASA can be changed when you convert to lowercase or title case. After converting, review proper nouns and restore them. Some languages have their own rules: in Turkish, the lowercase of I is a dotless i, and in German the uppercase of the letter ß is SS.

Practical uses

Use the tool to clean data imported from spreadsheets, standardise lists of names, fix headings, prepare titles for web pages and convert text pasted from PDFs. Be careful when you change case in email addresses, file names on case-sensitive systems and code, where capitalisation can change the meaning. For web addresses, lowercase is the safe convention, and for filenames pick one style and keep to it.

Choosing a style

Different places call for different styles. Interface text and article headlines often use sentence case, which reads naturally. Book and film titles often use title case. Long passages in capital letters are hard to read, since the shapes of words are less distinct, and they may be spoken letter by letter by some screen readers, so keep them to short labels. Choose one style for each kind of text on your site and apply it consistently, so that readers see a uniform pattern.

Cases used in programming

In programming, names follow case conventions. CamelCase joins words and capitalises each new word after the first, snake case uses lowercase words joined by underscores, kebab case uses hyphens, and Pascal case capitalises every word. Web addresses and file names usually use lowercase with hyphens. This tool covers uppercase, lowercase, title and sentence case for ordinary text, so for code identifiers you may need to adjust separators by hand. Pick one convention per project and keep to it.

Worked example: one sentence in four cases

Take the text the QUICK brown fox JUMPS over iPhone. In uppercase it becomes THE QUICK BROWN FOX JUMPS OVER IPHONE, and in lowercase the quick brown fox jumps over iphone. Title case gives The Quick Brown Fox Jumps Over Iphone, and sentence case gives The quick brown fox jumps over iphone. Notice that the brand name iPhone lost its special capital P in all four versions, which shows why you should review proper nouns and brand names after any automatic conversion and correct them by hand.

Headline styles and small words

Style guides disagree about title case. Most agree on capitalising the first and last words and all the main words, and many leave short articles, conjunctions and prepositions in lowercase unless they begin the title. For example, a title such as how to convert tola to grams: a simple guide is written How to Convert Tola to Grams: A Simple Guide in the common styles, with the word after the colon capitalised. News sites often prefer sentence case for headlines, which is easier to read and requires fewer decisions. Choose one style and use it across your site.

Cleaning names and data

When you clean lists of names or addresses, a case change is only the first step. Names such as McDonald, O'Neil and van der Berg have internal capitals or lowercase particles that a simple title case will break. Acronyms such as NASA or PDF should stay uppercase. In spreadsheets, a proper-case function has the same limits. For matching and deduplication, convert both sides to lowercase before you compare, but keep the original for display. Email addresses are normally treated as case-insensitive, so lowercase is a sensible way to store them.

Readability and accessibility

Long passages in capitals are hard to read, because the shapes of words are all similar, and some screen readers pronounce them letter by letter. Use capitals for short labels and acronyms. If you need capitals only for design, apply them with the CSS text-transform property so that the underlying text stays in normal case and works for search engines and assistive tools. In email subject lines, all capitals look like shouting and can trigger spam filters. Keep the original text so you can change your mind later.

Key terms explained

Uppercase means all capital letters and lowercase means none. Title case capitalises the main words of a heading, and sentence case capitalises only the first word and proper nouns. A proper noun is the name of a particular person, place or thing. An acronym is formed from the first letters of words and is usually written in capitals. Camel case, snake case and kebab case are naming styles used in programming. A style guide sets the rules for capitalisation in a publication.

Rules of thumb and quick checks

Capitalise the first and last word of a title and all the important words between. Short words such as a, an, the, and, of and in are often lowercase unless they come first or last. Keep acronyms in capitals and check proper nouns after any conversion. Use sentence case for interface text and many headlines. For matching or comparison, convert both sides to lowercase first.

Frequently asked questions