Online Case Converter

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Advanced Free Online Case Converter

Convert text between Uppercase, Lowercase, Title Case, Sentence Case, and more. Optimized for English, Turkish, German, French, and Spanish. 100% free and secure.

Why Do You Need a Case Converter?

Formatting text manually is tedious and prone to errors. Whether you accidentally left the Caps Lock key on, copied a list of names from a messy Excel sheet, or need to format a YouTube video title to get more clicks, doing it character-by-character is a waste of time.

GungorKaya.com's Case Converter solves this problem instantly. It is a smart utility that cleans up your text, fixes capitalization errors, and prepares your content for publishing in milliseconds.

Understanding the 5 Conversion Modes

Our tool offers five distinct modes, each designed for a specific purpose:

1. UPPER CASE (Transform to Capitals)

This mode converts every letter to its capital form.
Best for: Legal disclaimers, acronyms (NASA, HTML), warnings, and header designs.

Input: "hello world" → Output: "HELLO WORLD"

2. lower case (Data Normalization)

This mode transforms all text into small letters.
Best for: Email addresses, tags, coding variables, and cleaning up shouting text (ALL CAPS).

Input: "USER@Example.COM" → Output: "user@example.com"

3. Title Case (The Headline Maker)

Also known as "Proper Case." It capitalizes the first letter of every word.
Best for: Blog post titles, Book names, Movie titles, and Proper Nouns (names of people/places).

Input: "war and peace" → Output: "War And Peace"

4. Sentence case (Grammar Fixer)

This mode mimics standard writing rules. It only capitalizes the first letter of a sentence. It intelligently detects periods (.), question marks (?), and exclamation points (!).
Best for: Standard paragraphs, articles, and social media posts.

Input: "hi. how are you?" → Output: "Hi. How are you?"

5. aLtErNaTiNg cAsE (Social Media Mode)

This switches between lowercase and uppercase for every character.
Best for: Memes (Mocking SpongeBob), gaming usernames, and playful text.

Global Language Support 🌍

Most online tools only work for English. GungorKaya.com is engineered to handle the complexities of global languages. We support the entire Latin alphabet, including special characters and accents.

🇹🇷 Turkish Support

We correctly handle the dotted and dotless 'i'. Unlike other tools that convert "istanbul" to "ISTANBUL" (wrong), we convert it to "İSTANBUL" (correct). Similarly, "IĞDIR" becomes "ığdır".

🇩🇪 German (Deutsch) Support

We preserve Umlauts (Ä, Ö, Ü). For example, "über" correctly converts to "ÜBER". Our tool respects the linguistic rules of German text processing.

🇫🇷 French & 🇪🇸 Spanish

Accents are crucial. We ensure characters like é, à, ç, ñ are preserved during conversion. "Garçon" becomes "GARÇON", and "Mañana" becomes "MAÑANA".

🇵🇹 Portuguese Support

Full support for tilde and acute accents (ã, ó, ê). Perfect for formatting Brazilian or European Portuguese texts effortlessly.

Privacy & Security: 100% Client-Side

Many "free" tools upload your text to their servers to process it. This is a security risk, especially if you are working with confidential business emails or private data.

GungorKaya.com is different. Our Case Converter runs locally in your browser using JavaScript.

❌ No server uploads.
❌ No database storage.
✅ Your text stays on your device.
✅ Works even if you go offline.

Frequently Asked Questions

Everything you need to know about text case conversion.

Is this Case Converter free to use?

Yes, GungorKaya.com provides this tool 100% free of charge. You can use it as often as you like for emails, documents, or social media posts without any cost or registration.

Is my text private and secure?

Absolutely. Your privacy is our priority. This tool runs entirely in your web browser (client-side). We do not store, record, or transmit your text to any server. Once you close the tab, your text is gone.

What is "Title Case" used for?

Title Case capitalizes the first letter of every word (e.g., "The Quick Brown Fox"). It is commonly used for headlines, book titles, movie names, and blog post subjects to make them stand out.

What is the difference between "Sentence Case" and "Lower Case"?

Lower Case converts every single letter to small letters (e.g., "hello world"). Sentence Case acts like a proper sentence: it capitalizes the very first letter and leaves the rest lowercase (e.g., "Hello world").

Does this tool affect numbers or special characters?

No. Numbers (1, 2, 3), punctuation (!, ?, .), and special symbols (@, #, $) remain exactly the same. The tool only changes the capitalization of letters (A-Z).

Is there a limit to how much text I can convert?

There is no strict character limit. You can paste lengthy essays, articles, or code comments. Since it processes locally on your computer, the speed depends on your device, but it handles thousands of words instantly.

Does it work on mobile phones?

Yes, our design is fully responsive. You can easily access GungorKaya.com on your iPhone, Android, or tablet to fix text capitalization on the go.

Will I lose my text formatting (bold, italic)?

This tool is a "Plain Text" converter. When you paste text from a Word document or website, it will strip out styling like bold, italic, or colors, leaving you with clean text. This is often useful for removing unwanted formatting.

What is "Alternating Case"?

Alternating Case switches between lowercase and uppercase for every letter (e.g., "tExT lIkE tHiS"). It is popularly used in internet memes, gaming usernames, and casual social media conversations.

Does it support languages other than English?

Yes, the converter works with most languages that use the Latin alphabet, including Spanish, French, German, Turkish, Portuguese, and Italian.