Online Case Converter
Convert text to uppercase, lowercase, title case, sentence case, alternating case or inverse case instantly. Your content stays inside your browser.
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Convert text case instantly
This free case converter helps you quickly change capitalization without retyping text. It works for headings, article titles, social media captions, code comments, names, product listings and documents.
Available text case formats
- Uppercase: converts every letter to capital letters.
- Lowercase: converts every letter to small letters.
- Title case: capitalizes the main words in a title.
- Sentence case: capitalizes the beginning of sentences.
- Alternating case: switches between lower and uppercase characters.
- Inverse case: flips uppercase letters to lowercase and vice versa.
Frequently asked questions
Can I convert long documents?
Yes. The conversion happens in your browser and works with long blocks of text.
Is my text stored?
No. The tool does not send your text to a server.
What is title case?
Title case capitalizes important words while keeping short connecting words lowercase in most situations.
Choose the case style that matches where the text will be used
Case conversion is useful when text has been copied from spreadsheets, documents, code or forms with inconsistent capitalization. The right output depends on context: sentence case suits normal prose, title case is useful for headings, and uppercase is best reserved for short labels where emphasis is intentional.
Case conversion does not rewrite grammar
The tool changes letter casing; it does not decide whether a proper noun, acronym or brand name needs special capitalization. After converting a long passage, quickly review names such as iPhone, GitHub, YouTube or country and company names.
For code and structured text
Be careful when changing case in source code, filenames, URLs or identifiers. Some systems are case-sensitive, so converting them can change meaning or break a reference. Use the tool mainly for human-readable text unless you know the target format rules.
When automatic case conversion needs a manual review
Case conversion is mechanical. It can change uppercase and lowercase characters quickly, but it cannot reliably know whether a word is a brand, acronym, code symbol or proper noun. Review names such as GitHub, iPhone, API, SQL and product model numbers after converting a long passage.
Title case differs between style guides
Publishers do not all use the same title-capitalisation rules. This tool provides a practical conversion for quick editing, not a replacement for a specific editorial style such as APA, AP or Chicago.
Code and passwords
Do not run source code, passwords, API keys or other case-sensitive identifiers through a case converter unless you intentionally want to change them. Changing letter case can make those values invalid.
Local processing
The text is transformed in your browser. ITFixLab does not need to upload the text to perform the conversion.