Case Converter
Transform text between Sentence case, Title Case, UPPERCASE, lowercase, and 3 more modes.
Free browser-based tool. Files are processed locally in your browser.
Open the Case ConverterInteractive Case Converter workspace loads in your browser.
How to Use the Case Converter
Transform text across seven letter-casing modes instantly while keeping original line breaks, spacing, numbers, and Unicode/Khmer scripts intact.
- 1
Enter or paste your source text into Input Text
Type or paste your text (up to 5 MB) into the left Input Text panel, or click Load Sample Text when the editor is empty to test all seven conversion modes.
- 2
Select one of the 7 conversion mode buttons
Click UPPERCASE, lowercase, Title Case, Sentence case, Capitalize Each Word, Toggle Case, or Invert Case. The Converted Output panel updates immediately as you switch modes or edit your input.
- 3
Use Swap Output to Input for multi-step workflows (optional)
Click Swap Output to Input in the Converted Output header if you want to move the transformed result back into the Input Text box for further editing.
- 4
Copy or download the converted result
Click Copy Output to copy the converted text to your clipboard, or click Download .txt to save the result as a UTF-8 `.txt` file Named after your active mode (e.g., `alltoolsfree-title-case.txt`).
Understanding the 7 Text Case Conversion Modes
Reformatting headlines, accidentally caps-locked paragraphs, imported spreadsheet columns, or bibliography titles by hand is tedious and error-prone. The AllToolsFree Case Converter provides seven distinct, deterministic casing algorithms that operate strictly on letter casing without stripping your indentation, multiple spaces, or paragraph breaks.
Because theInput Text and Converted Output panels sit side by side (with live character, word, and line counts above each panel), you can compare your original text against each casing style and switch modes non-destructively at any time.
Common Practical Use Cases
- Converting blog post titles, video headlines, and section headers into clean Title Case where minor short words (like "and", "of", "in", "for", "to") stay lowercase unless they start or end the title.
- Fixing paragraphs typed with Caps Lock turned on by converting them to Sentence case or using Invert Case.
- Standardizing customer names, city lists, or product SKUs into Capitalize Each Word or UPPERCASE before importing into a database or spreadsheet.
- Formatting mixed English and Khmer (`ភាសាខ្មែរ`) documents where English terms need case standardization without corrupting surrounding Khmer Unicode characters.
Title Case vs. Capitalize Each Word vs. Sentence Case
Many users wonder how Title Case, Capitalize Each Word, and Sentence case differ. In **Capitalize Each Word**, every single word—regardless of whether it is a preposition or article—has its first cased letter capitalized and remaining letters lowercased (e.g., `The Quick Brown Fox In The Forest`). In **Title Case**, the converter follows editorial headline rules on each line: the first word, the last word, and any word immediately following `:`, `;`, `—`, `–`, or `-` are always capitalized, while standard minor words (`a`, `an`, `and`, `as`, `at`, `but`, `by`, `for`, `from`, `in`, `into`, `nor`, `of`, `on`, `onto`, `or`, `over`, `per`, `so`, `the`, `to`, `up`, `via`, `with`, `yet`) are lowercased in the middle of a title.
In **Sentence case**, the entire text is first lowercased, and then only the very first cased letter of the text and the first cased letter following sentence-ending punctuation (`.`, `!`, `?`, or a newline `\n`) are capitalized. Meanwhile, **Toggle Case** alternates `UPPER`/`lower` on every consecutive cased letter (`hElLo`), whereas **Invert Case** flips the existing case of every letter (`Hello` becomes `hELLO`).
Helpful Tips to Avoid Common Mistakes
- Choose Title Case for article headings and book titles; choose Capitalize Each Word for proper nouns, people’s names, and street addresses.
- Note that Sentence case lowercases all words except the first word of each sentence—so check any proper nouns or acronyms (like "NASA" or "PDF") after converting an all-caps paragraph to Sentence case.
- If you typed a sentence with Caps Lock on (so the first letter of each word is lowercase and the rest are uppercase, like `hELLO wORLD`), click Invert Case to flip every letter back immediately.
- If you also need to remove extra spaces or blank lines from your text, copy your converted output into the Duplicate Line & Whitespace Cleaner.
Case Converter Frequently Asked Questions
What is the difference between Title Case and Capitalize Each Word?
Capitalize Each Word capitalizes the first letter of every word without exception. Title Case applies headline rules per line: it capitalizes major words as well as the first and last word of each title and words after colons or dashes, while keeping short articles, conjunctions, and prepositions (such as "the", "of", "in", "and", "for") lowercase when they appear in the middle.
What is the difference between Toggle Case and Invert Case?
Invert Case reverses the current case of each letter (uppercase becomes lowercase, and lowercase becomes uppercase). Toggle Case ignores the original case and strictly alternates Uppercase, lowercase, Uppercase, lowercase across every cased letter in sequence.
Does the Case Converter remove extra spaces or empty lines?
No. By design, the Case Converter changes only letter casing and preserves all spaces, tabs, and line breaks 1:1. To strip extra spaces or duplicate lines, use the Duplicate Line & Whitespace Cleaner.
What happens to Khmer script, emojis, and numbers during case conversion?
Scripts without uppercase/lowercase distinctions (such as Khmer ភាសាខ្មែរ), numbers, symbols, and emojis are passed through untouched without corruption.
Related Browser Utilities for Case Converter
Explore complementary AllToolsFree utilities that pair directly with Case Converter:
Word Counter – Check Headline & Essay Character Limits
Measure exact word counts, character counts, and reading time for your formatted text.
Duplicate Line & Whitespace Cleaner – Trim & Sort Text Lists
Remove duplicate rows, collapse double spaces, and sort your case-converted lines A–Z.
Text Diff Checker – Compare Original and Formatted Text
Compare two versions of a text block line by line to inspect changes.