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Online text case converter supporting multiple modes including uppercase, lowercase, and title case.
When you need to standardize document formatting, meet coding conventions, or process imported data, inconsistent text case can create extra proofreading work. This tool quickly processes the "case" of English text (Uppercase or Lowercase), outputting uniformly formatted text based on your specified rules. It supports converting any English text into five modes: uppercase, lowercase, Title Case, Sentence case, or first letter lowercase. Non-English characters (such as numbers, punctuation, and Chinese characters) will remain unchanged.
Q: What is the difference between Title Case and Sentence case?
This is the most common point of confusion. "Title Case" capitalizes the first letter of every word in the text and makes the rest lowercase, which is ideal for headings (e.g., This Is A Test Word!). "Sentence case" only capitalizes the very first letter of the entire text string, leaving the rest unchanged, which is suitable for the beginning of a sentence (e.g., This is a test word!).
Q: Will punctuation change after converting "Hello, World!"?
No. The tool only changes the case of English letters. All non-alphabetical characters (including commas, exclamation marks, spaces, and numbers) remain exactly the same before and after conversion.
Please note that this tool primarily handles case conversion for English (Latin) letters. It has no effect on non-alphabetical languages like Chinese or Japanese. When processing text that contains proper nouns or acronyms (such as "iPhone" or "NASA"), the converted result might not meet specific contextual requirements, so a manual secondary check is recommended. All conversion operations are performed locally in your browser; your text is never uploaded to our servers, ensuring your privacy.
For developers, when handling user input or database strings, it is often necessary to standardize case for comparison or storage. For example, converting user email addresses to lowercase before validation can prevent duplicate registrations caused by case inconsistencies. The five modes provided by this tool correspond to different programming scenarios: defining constants often uses "UPPERCASE", naming variables often uses "first letter lowercase" (camelCase), and formatting output might use "Title Case". A typical example: inputting "json Data From API" and selecting "Title Case" will output "Json Data From Api". However, this might not meet the expectation that the acronym "API" should remain fully capitalized. Therefore, manual review after automated processing is still necessary in professional contexts.
