• UPPER - ALL UPPERCASE (e.g. HELLO WORLD)
• lower - all lowercase (e.g. hello world)
• Title - Title Case (e.g. Hello World)
• Sentence - Sentence case (e.g. Hello world)
• camelCase - Lower camelCase (e.g. helloWorld)
• snake_case - Snake case (e.g. hello_world)
• kebab-case - Kebab case (e.g. hello-world)
Automatically trim leading/trailing whitespace and collapse multiple consecutive spaces into a single space.
Live display of character count (with spaces) and word count (split by whitespace), including Chinese character detection.
This tool supports seven common case formats, space trimming, and live word/character counting—ideal for developers, editors, and writers who need to format text quickly. Here is the detailed guide:
Step 1: Enter the text. Paste or type the content you want to convert into the "Input Text" textarea. The tool supports mixed Chinese and English text; Chinese characters are recognized as independent semantic tokens. Live stats show character count, word count, and Chinese character count dynamically.
Step 2: Choose a conversion format. Click any format button to convert instantly. The effects are: UPPER converts all text to uppercase; lower to lowercase; Title capitalizes the first letter of each word; Sentence capitalizes only the first letter of each sentence; camelCase removes separators and capitalizes the first letter of each word except the first; snake_case lowercases everything and joins with underscores; kebab-case lowercases and joins with hyphens.
Step 3: Trim spaces and chain conversions. If the original text has extra spaces, click "Trim Spaces" to remove leading/trailing whitespace and collapse multiple consecutive spaces into one. To apply another format to the result, click "↑ Result to Input" to feed it back into the input field, then choose another format.
Step 4: Copy the result. Once converted, the result appears in the output area below. Click "📋 Copy Result" to copy it to the clipboard for pasting into code editors, documents, or other apps.
Programming variable naming standardization: When writing code, variable, function, and file names must follow project conventions. For example, JavaScript typically uses camelCase, Python uses snake_case, CSS classes use kebab-case, and constants use UPPER_CASE. If you copy naming from an external source that does not match your convention, this tool can batch-convert it to the required format, improving code consistency.
Document title formatting: When editing technical documents, blog posts, or marketing copy, title capitalization styles may need to match the publishing platform. APA style often uses Title Case, while sentence case works better for list headings. Use this tool to quickly standardize a batch of titles instead of manually editing each one.
Data cleaning and preprocessing: Raw text exported from Excel, databases, or log files often has inconsistent capitalization and redundant spaces. This tool’s batch conversion and space-trimming features quickly normalize data so it meets the format requirements for further analysis or import, making it a handy helper for data analysts and DevOps engineers.
History and evolution of naming conventions: camelCase originated in the Pascal community and is named for its resemblance to a camel’s humps; snake_case is widely adopted in Python and C for its readability; kebab-case appears frequently in Lisp and CSS, named because hyphens look like skewers on a kebab. Understanding the cultural background of these conventions helps maintain consistency and professionalism across different tech stacks.
Internationalization and case handling: Different languages have significantly different case rules. For example, the German ß (eszett) uppercases to SS; Turkish has separate dotted (İ/i) and dotless (I/ı) i pairs; and Greek has multiple case-conversion rules. This tool is built on JavaScript’s toUpperCase() and toLowerCase(), which follow Unicode’s case-folding standard and provide good support for common languages.
Case conversion and accessibility: In web design, using CSS text-transform: uppercase to display uppercase text is generally better for screen-reader users than hardcoding uppercase letters in HTML. Screen readers often adjust pronunciation based on actual letter case (for example, "USA" in all caps may be read letter-by-letter). Therefore, when visual uppercase is needed, keep the original text casing and control the display via styles.
camelCase (lower camel case) starts with a lowercase letter and capitalizes the first letter of each subsequent word without separators, e.g. userName. snake_case uses all lowercase with underscores between words, e.g. user_name. kebab-case uses hyphens as separators, e.g. user-name.
Absolutely. This tool is fully client-side. All conversion operations happen locally in your browser and no data is ever sent to any server.
Yes. The tool supports mixed-language text including Chinese characters. Chinese characters are treated as separate tokens when converting to camelCase, snake_case, or kebab-case.