Case Converter

How to convert text case

1. Type or paste text into the first box.
2. Choose sentence, title, lower or upper case.
3. Review names, abbreviations and language-specific letters in the live result.
4. Copy or download the plain-text result. Use result as input if a second deliberate conversion is needed.

What each style does

Sentence case

Lowercases the text and capitalizes the first letter after a full stop, question mark, exclamation mark or line break.

Title Case

Capitalizes every word. It intentionally uses a simple style rather than language-specific publishing rules for small words.

lowercase and UPPERCASE

Use the browser's locale-aware case rules, including Unicode letters.

Choose a style for the task

Repair text typed with Caps Lock

Sentence case is a quick starting point for prose. It lowercases first, then capitalizes the first letter after supported sentence marks and line breaks.

Prepare a simple heading

Title Case capitalizes each word predictably. Compare the result with your publication's style guide before using it in a final headline.

Normalize identifiers for comparison

lowercase can make visual comparison easier, but do not change passwords, case-sensitive codes or IDs unless their specification allows it.

Create a short label

UPPERCASE can suit compact labels and test data. Long uppercase passages are harder to scan, so keep ordinary prose readable.

Run two transformations

Choose Use result as input only after checking the first output. This replaces the source box and cannot reconstruct the original capitalization.

How Sentence case decides where to capitalize

Sentence case first converts all letters to lowercase. It then capitalizes the first letter at the start of the text, after a full stop, question mark or exclamation mark, and after a line break. It does not understand abbreviations, quoted dialogue or proper nouns.

For example, “DR. MAY VISITS THE U.K.” becomes a predictable mechanical result, not an editorially verified sentence. Restore names, initialisms and special capitalization during review.

Why Title Case may differ from a style guide

Editorial title case often keeps short articles, conjunctions and prepositions lowercase unless they begin or end the heading. Those rules vary by publisher and language. This tool instead capitalizes every word-like segment, which is consistent but intentionally simple.

Unicode and locale-aware casing

The browser applies Unicode-aware case rules using the page locale. Some lowercase and uppercase forms do not have the same length, and a letter's correct casing can depend on language. Emoji, punctuation, spaces and line breaks are left in place.

The visible-character counter groups joined emoji and combining accents as grapheme characters. That makes the count closer to what a person sees, although fonts and applications can render complex sequences differently.

Preserving structure

Conversion changes letter casing only. It does not trim spaces, merge lines, remove formatting marks or rewrite punctuation. Downloaded results are plain UTF-8 text, so rich-text styles from the source are not included.

Review important text

Case conversion is helpful for drafts, labels, classroom examples and test data. It should not silently alter legal names, scientific notation, trademarks, URLs, passwords or case-sensitive identifiers. Keep the original until the result has been checked.

Limits and privacy

The converter accepts up to 100,000 characters and runs entirely in this browser. It does not upload or save your input. Case conversion can change the number of encoded characters for some languages, and it does not correct spelling, grammar or meaning.

Common questions