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Case Converter is a completely free, instant-use online tool for handling English letter case. It switches any text into the writing format you need within seconds, making it an efficient assistant for English writing, code naming, copy layout and data normalization. The tool offers seven conversion modes: ALL UPPERCASE, all lowercase, capitalize first letter, capitalize the first letter of every word (title case), sentence case, camelCase and snake_case — covering most needs in daily writing and coding conventions. Simply paste your text and pick the target format, and the tool instantly outputs the result with real-time what-you-see-is-what-you-get preview. Whether you are unifying an English article into title case, converting database field names into camelCase or snake_case, quickly restoring all-uppercase content to normal case, or batch-normalizing messy pasted copy, it handles everything accurately. The converted result can be copied or downloaded in one click for immediate use. All processing happens locally in your browser — your text is never uploaded to any server, so your privacy is protected. The interface is clean and simple, available in Simplified Chinese, Traditional Chinese and English, automatically follows the website language, theme color and corner-radius style, and works on both desktop and mobile. No registration, no installation — just open and use. Case Converter is a high-frequency practical tool for programmers, editors, translators and students.