How to Change Text Case: Uppercase, Lowercase, Title Case and More

A case converter changes the capitalization of text from one format to another. Instead of manually editing every word or letter, you can convert an entire block of text in seconds.

Case conversion is useful when cleaning copied text, preparing documents, formatting headings, writing code, or making text consistent across a document.

Uppercase converts letters to capital letters. For example, a phrase such as "hello world" becomes "HELLO WORLD".

Lowercase converts letters to small letters. For example, "HELLO WORLD" becomes "hello world".

Title Case capitalizes words according to title-style capitalization. It is commonly used for headings and titles.

Sentence case uses normal sentence capitalization, with the first letter of a sentence capitalized and the remaining letters generally lowercase.

A case converter can save time when text has inconsistent capitalization. This often happens when copying text from websites, spreadsheets, documents, emails, or other applications.

It can also help when preparing headings, standardizing labels, cleaning imported data, or converting text into a format required by another application.

Paste or enter your text into a case converter and select the uppercase option. The converter changes the letters to capital letters while keeping the text itself intact.

Uppercase is useful for labels, short headings, abbreviations, and situations where a system specifically requires capital letters.

To convert text to lowercase, enter the text and choose the lowercase option. The converter changes the letters to lowercase without requiring you to edit each word manually.

Lowercase conversion is useful when standardizing text, preparing certain data fields, or correcting text that was accidentally typed in uppercase.

Title case changes text so that important words begin with capital letters. It is commonly useful for article titles, headings, names of sections, and other displayed text.

Because capitalization conventions differ between writing styles, title-case conversion should be treated as a formatting convenience rather than a replacement for editorial review.

Sentence case is useful when text needs to look like normal prose rather than a title or heading. A case converter can quickly transform text into a consistent sentence-style format.

After conversion, review the result if the text contains names, acronyms, technical terms, or other words that require special capitalization.

Changing capitalization manually becomes tedious when working with long passages. It is also easy to miss individual words or create inconsistent formatting.

A case converter applies the selected transformation to the text consistently, making it useful for repetitive formatting tasks.

MartTools includes a Case Converter as part of its Text Utilities tool. Enter or paste your text, choose the case transformation you need, and use the converted result.

For larger text-cleaning tasks, the Text Utilities tool also includes other operations that can help prepare text before or after changing its capitalization.

Review converted text when it contains proper names, acronyms, abbreviations, programming syntax, or specialized terminology. Automatic case conversion cannot always know which words have intentionally unusual capitalization.

If the text also contains unnecessary spaces, duplicate lines, or unwanted line breaks, clean those issues separately so the final text is easier to use.

Changing text case is mainly a formatting task. It can make text more consistent and save time, but the correct capitalization still depends on the purpose and context of the writing.

For polished documents, review the converted text before publishing or submitting it, especially when names, acronyms, or specialized terms are involved.