A batch text case converter is a tool that transforms the letter case of multiple lines or entire files at once. Instead of manually retyping or editing each item, you can paste lists, upload files, or type text and convert everything instantly to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and many other formats — saving hours of tedious manual editing.

We support 12 modes: UPPERCASE, lowercase, Title Case, Sentence case, tOGGLE cASE (inverts each letter), aLtErNaTiNg cAsE, Capitalize First letter only, camelCase, PascalCase, snake_case, kebab-case, and CONSTANT_CASE. Each mode serves a different purpose — from everyday writing to programming identifier naming conventions.

Title Case capitalizes the first letter of every word (e.g., "The Quick Brown Fox"). Sentence case only capitalizes the first letter of the first word in each sentence (e.g., "The quick brown fox jumps over the lazy dog"). Title Case is commonly used for headings and book titles, while Sentence case is standard for body text and articles.

Yes! You can upload .txt, .csv, .json, .md, .log, .xml, .html and other plain-text files up to 5 MB. Simply drag and drop a file onto the upload zone or click to browse. The file content will be loaded into the input area, and if auto-convert is enabled, the conversion happens immediately. You can then download the converted result.

Line-by-line treats each line as an independent unit — perfect for lists of names, product titles, or code identifiers where each line needs individual conversion (e.g., a list of names all converted to Title Case). Whole-text processing treats everything as one continuous block, which is better for sentences and paragraphs where context flows across lines.

Select camelCase, PascalCase, snake_case, kebab-case, or CONSTANT_CASE from the conversion modes. These are designed for developers: camelCase (e.g., myVariable) for JavaScript/Java, PascalCase (MyClass) for class names, snake_case (my_column) for Python/SQL, kebab-case (my-component) for CSS/URLs, and CONSTANT_CASE (MAX_SIZE) for constants. Enable Line by line mode when converting a list of identifiers.

Yes. Non-alphabetic characters — including numbers, punctuation, emojis 😊, symbols, and whitespace — are preserved as-is during conversion. Only letters (A-Z, a-z) are modified based on the selected case mode. This ensures your formatting, special characters, and data structures remain intact throughout the conversion process.