Case Converter: kebab-case

Convert text to kebab-case. Example: Hello World → hello-world

Input

Output (kebab-case)

What It Does

Convert text to kebab-case format, where spaces are replaced with hyphens and all letters are lowercase. This format is commonly used in URLs, CSS class names, and HTML attributes.

How It Works

The Case Converter: kebab-case applies its selected transformation logic to your input and produces output based on the options you choose.

It applies a fixed set of transformation rules to your input, so the output is stable and easy to verify.

All processing happens in your browser, so your input stays on your device during the transformation.

Common Use Cases

Creating URL slugs for web pages
Formatting CSS class names
Generating HTML element IDs
Creating readable file names

How to Use

Enter your text (words separated by spaces)
The text is converted to kebab-case format
Copy the result for URLs or CSS

Features

Replaces spaces with hyphens
Converts to lowercase
URL-safe format

Edge Cases

Very large inputs may take a few seconds to process in the browser. If performance slows, split the input into smaller batches.
Mixed formatting (tabs, line breaks, or inconsistent delimiters) can affect output. Normalize spacing first if needed.
Case Converter: kebab-case follows the selected options strictly. If the output looks unexpected, re-check option settings and input format.

Troubleshooting

Output looks unchanged: confirm the input contains the pattern this tool modifies and that the correct options are selected.
Output differs from a previous run: confirm that the input and every option match, because deterministic tools should repeat when the settings are identical.
Unexpected characters: check for hidden whitespace or encoding issues in the input and try normalizing first.
Slow processing: reduce input size or try a modern browser with more available memory.

Tips

kebab-case is preferred for URLs because hyphens are treated as word separators by search engines.

Introduction: SEO-Friendly URL and CSS Naming

The kebab-case converter transforms text into the naming format where words are lowercase and separated by hyphens, creating identifiers like user-profile, blog-post-title, or nav-menu-item. This naming convention is the standard for URLs, CSS class names, HTML IDs, and other web-facing identifiers. The name comes from the visual resemblance to words skewered on a kebab stick, connected by hyphens.

Kebab-case is particularly important for SEO (Search Engine Optimization) because search engines like Google treat hyphens as word separators, correctly interpreting "blog-post-title" as three separate words. In contrast, underscores or lack of separators can cause search engines to treat multi-word phrases as single terms, potentially harming discoverability. This makes kebab-case the universally preferred format for URL slugs and web resource names.

Beyond URLs, kebab-case is the recommended convention for CSS class names in methodologies like BEM (Block Element Modifier) and is widely used for HTML element IDs. Its lowercase-with-hyphens format creates readable, URL-safe, and universally compatible identifiers that work consistently across all browsers, operating systems, and web technologies.

Who Uses Kebab Case?

Web developers and frontend engineers use kebab-case extensively for CSS class names and HTML IDs, creating selectors like .user-profile or #main-navigation. SEO specialists and content managers use it for URL slugs, converting article titles into SEO-friendly URLs like /blog/how-to-optimize-images. Package and library names in npm (Node Package Manager) often use kebab-case, such as express-validator or body-parser.

Web designers working with CSS frameworks like Bootstrap and Tailwind CSS use kebab-case for custom class names that integrate with existing utility classes. DevOps engineers use kebab-case for Docker container names, Kubernetes resource names, and configuration file names where hyphens are preferred over underscores or spaces. Static site generators like Jekyll and Hugo use kebab-case for file names and URL structures.

How Kebab Case Conversion Works

The tool processes text by identifying word boundaries (spaces, underscores, or capital letters in mixed-case text), converting all letters to lowercase, and joining words with hyphen characters. For example, "User Profile Page" becomes "user-profile-page". The algorithm removes special characters that aren't URL-safe and replaces all separators with hyphens.

The conversion handles various input formats intelligently. Whether you provide "User Profile" (Title Case), "userProfile" (camelCase), or "user_profile" (snake_case), it correctly identifies word boundaries and converts to kebab-case. This flexibility makes it perfect for converting natural language phrases, database column names, or existing code identifiers into web-friendly formats.

Example: Before and After

Before: "About Our Company"

After: "about-our-company"

Multiple Use Cases:

"contact us" → "contact-us" (URL slug)
"Main Navigation Menu" → "main-navigation-menu" (CSS class)
"userProfile" → "user-profile" (ID attribute)
"product_category" → "product-category" (file name)

All conversions create clean, lowercase, hyphen-separated identifiers perfect for web use.

Why Kebab Case is Essential for Web Development

Kebab-case is the only naming convention that's universally URL-safe, SEO-friendly, and human-readable. Search engines parse hyphens as word separators, so "best-pizza-recipes" is understood as three distinct keywords, improving search ranking. Underscores don't provide this benefit, and camelCase or PascalCase can appear awkward in URLs where case sensitivity varies by server configuration.

The convention's lowercase-only approach eliminates case-sensitivity concerns that can cause broken links on case-sensitive servers. A URL like /About-Us might work locally but fail on production if the server expects /about-us. Kebab-case prevents these issues entirely. Additionally, hyphens are easier to type and read in URLs compared to underscores (which require the shift key) or camelCase (which looks awkward in URLs).

Frequently Asked Questions

Why are hyphens better than underscores for URLs?

Search engines treat hyphens as word separators but often treat underscores as word connectors. This means 'best-pizza' is seen as two keywords while 'best_pizza' might be seen as one, affecting SEO.

Should CSS class names always use kebab-case?

While not strictly required by CSS, kebab-case is the overwhelming convention for class names and is recommended by all major CSS methodologies (BEM, SMACSS, OOCSS).

Can this convert from camelCase?

Yes, the tool recognizes capital letters as word boundaries in camelCase or PascalCase and correctly converts them to kebab-case.

Are uppercase letters allowed in URLs?

While technically allowed, URLs are case-sensitive on many servers, making uppercase problematic. Kebab-case ensures compatibility by using only lowercase.

Is this tool secure?

Yes, all conversions happen in your browser. No text is sent to servers, stored, or logged, ensuring complete privacy for your URLs and code.

Can I use kebab-case for file names?

Absolutely. Kebab-case creates clear, readable file names that work consistently across all operating systems without special character escaping.