Slug Generator
Convert any title or phrase into a clean, URL-safe slug. Removes diacritics and special characters automatically. Supports hyphen, underscore, and dot separators.
Key features
- Converts any text to a clean, URL-safe slug
- Removes diacritics and special characters automatically
- Customizable separator (hyphen, underscore, dot)
- Real-time preview with one-click copy
Guide
A URL slug is the part of a web address that identifies a specific page in human-readable form. In the URL https://example.com/blog/how-to-optimize-images, the slug is how-to-optimize-images. Good slugs are short, descriptive, lowercase, and use hyphens to separate words. They contain only letters, numbers, and hyphens. No spaces, no special characters, no encoded sequences like %20, no uppercase letters. Slug generation converts a human-written title or phrase into this URL-safe format. The process involves several transformations applied in sequence: converting all characters to lowercase, replacing spaces with hyphens (or another separator), removing punctuation and special characters, converting accented and diacritical characters to their ASCII equivalents, collapsing consecutive hyphens into a single hyphen, and trimming leading and trailing hyphens. The simplest conversion takes a title like "My First Blog Post" and produces "my-first-blog-post." But real-world titles are messier. "10 Best Cafes in Istanbul - A Complete Guide!" needs to become "10-best-cafes-in-istanbul-a-complete-guide." The exclamation mark, the dash surrounded by spaces, and the capital letters all need handling. A German title like "Grundungskosten fur GmbH & Co. KG" should become "grundungskosten-fur-gmbh-co-kg" with umlauts converted to their base letters, the ampersand removed, and periods stripped. The tool handles all of these transformations automatically. Slugs matter for SEO in measurable ways. Google uses the URL as a ranking signal, and pages with descriptive, keyword-rich slugs have a documented advantage over pages with generic or parameter-based URLs. A search for "image compression tool" will rank /image-compression-tool higher than /tool?id=47, all else being equal. The slug also appears in search results, displayed in green text between the domain and the page title. Users are more likely to click a URL they can read and understand. Google's own Search Central documentation explicitly recommends using "simple, descriptive words" in URLs and avoiding "unnecessarily long URLs with multiple parameters." A study by Backlinko analyzing 11.8 million Google search results found that shorter URLs tend to rank higher. The average URL on page one of Google had a path length of about 50-60 characters. While correlation is not causation, the pattern is consistent enough to be worth following. Keep your slugs focused on the core topic and trim filler words. Beyond SEO, clean slugs improve usability in several ways. Users can look at a URL and know what the page contains before clicking, which builds trust. They can edit the URL in the address bar to navigate (removing the last segment to go up a level in the site hierarchy). They can share the URL verbally ("go to our site slash best-image-compressors") or in text messages without worrying about encoded characters breaking the link or making it unreadable. They can remember the URL and type it directly. A clean slug is a small detail that signals professionalism and attention to quality. Messy URLs with parameter strings and encoded characters make users feel less confident about a site. Diacritics and international characters require special handling in slug generation. Characters with accent marks, tildes, umlauts, cedillas, and other diacritical marks need to be converted to their ASCII base equivalents. Here is how common characters are converted: Turkish: c becomes c, g becomes g, i becomes i, o becomes o, s becomes s, u becomes u German: a-umlaut becomes a (or ae), o-umlaut becomes o (or oe), u-umlaut becomes u (or ue), sharp s becomes ss French: e-accent-acute becomes e, e-accent-grave becomes e, a-circumflex becomes a, c-cedilla becomes c Spanish: n-tilde becomes n, a-accent becomes a, u-dieresis becomes u Polish: l-stroke becomes l, z-dot becomes z, s-acute becomes s Portuguese: a-tilde becomes a, o-tilde becomes o The tool handles all of these automatically using Unicode normalization (NFD decomposition) combined with a comprehensive character mapping for cases that NFD does not cover, like Polish l-stroke or German sharp s. Non-Latin scripts like Arabic, Chinese, Japanese, Korean, Cyrillic, and Thai present a fundamentally different challenge. There is no simple ASCII equivalent for these characters. Several approaches exist. Transliteration converts characters to a phonetic Latin representation: Japanese hiragana for "sushi" becomes "sushi" in romaji. Chinese characters can be converted to pinyin. Arabic can be transliterated to a Latin approximation. Some slug generators remove non-Latin characters entirely, which is only acceptable if the title also contains Latin text. For multilingual websites with dedicated language paths (/ja/blog/sushi-no-tsukurikata), transliterated slugs work well. The key is consistency within your URL structure. Separator choice affects both readability and SEO. Hyphens are the standard for web URLs and the separator Google recommends. Google treats hyphens as word separators, meaning "image-compressor" is read as two separate words: "image" and "compressor." Underscores are not treated as word separators by Google, so "image_compressor" is read as a single compound term "image_compressor." This distinction has been confirmed by Google engineer Matt Cutts and is documented in Google's webmaster guidelines. For SEO purposes, hyphens are the clear winner. Underscores are sometimes used in file-based URLs and API endpoints. Dots are occasionally used for version numbers or file-like resources. The generator lets you choose your separator to match your project's conventions, but defaults to hyphens for good reason. Here is how slug generation works in practice for a content management system. When an author writes a blog post with the title "How to Reduce Image File Size Without Losing Quality in 2026," the CMS automatically generates a slug: "how-to-reduce-image-file-size-without-losing-quality-in-2026." That slug is 61 characters, which is on the long side. The author might manually shorten it to "reduce-image-file-size" (22 characters) for a cleaner URL that still contains the primary keywords. This is a common workflow: auto-generate the slug from the title, then optionally trim it to focus on the core keywords. Slug length recommendations vary among SEO professionals, but the consensus is to keep slugs between 3 and 5 words, or under 60 characters. Google can display and process longer URLs, but shorter URLs are easier to read, easier to share, and statistically correlate with higher rankings. Remove stop words like "a," "the," "and," "or," "of," "in," "to," "for," "with" unless they are essential to meaning. "The Complete Guide to Optimizing Images for the Web" becomes "optimize-images-web" or "image-optimization-guide" rather than "the-complete-guide-to-optimizing-images-for-the-web." Duplicate slugs create technical problems. If two blog posts generate the same slug, one will overwrite the other (in file-based systems) or the system will append a number (my-post, my-post-2, my-post-3). Most CMS platforms like WordPress, Ghost, and Strapi handle uniqueness automatically. When building a custom system, you need to check for slug uniqueness at the database level. A common pattern is to query the database for existing slugs that match, and if a collision is found, append a counter: base slug: "image-optimization" if exists: "image-optimization-2" if that exists: "image-optimization-3" The generator creates the base slug from your input. Ensuring uniqueness within your site is a step you handle in your CMS, database, or routing layer. For developers building custom slug generation in JavaScript, here is a robust implementation pattern: function generateSlug(text, separator = '-') { const charMap = { 'ss': 'ss', 'ae': 'ae', 'oe': 'oe', 'ue': 'ue' }; let slug = text; // Handle special multi-char replacements Object.entries(charMap).forEach(([from, to]) => { slug = slug.replace(new RegExp(from, 'g'), to); }); return slug .normalize('NFD') // decompose accented chars .replace(/[\u0300-\u036f]/g, '') // remove combining marks .toLowerCase() .trim() .replace(/[^a-z0-9\s-]/g, '') // remove non-alphanumeric .replace(/[\s]+/g, separator) // spaces to separator .replace(new RegExp(`${separator}+`, 'g'), separator) // collapse .replace(new RegExp(`^${separator}|${separator}
, 'g'), ''); // trim } The normalize('NFD') step decomposes accented characters into their base character plus a combining mark (e.g., e-accent becomes e + combining acute accent). The regex [\u0300-\u036f] matches all combining diacritical marks and removes them. The result is the base ASCII character. Then the string is lowercased, non-alphanumeric characters are removed, spaces become the separator, consecutive separators are collapsed, and leading/trailing separators are trimmed. This implementation covers most Latin-script languages well. For production use with global input, add a transliteration map for characters that the normalize approach misses: German sharp s (ss to ss), Polish l-stroke (l), Icelandic eth (d) and thorn (th), Vietnamese composite characters, and others. Libraries like slugify (npm), limax, and speakingurl provide these extended mappings and handle edge cases that a basic implementation misses. Slug changes after publication create serious SEO problems. If you change a published page's slug, the old URL returns a 404 error unless you set up a redirect. Any external backlinks pointing to the old URL lose their ranking value (link equity). Social media shares of the old URL break. Bookmarks stop working. Search engines need time to discover the redirect, crawl it, and transfer the ranking signals to the new URL, which can take weeks or months. During that transition, you may see a temporary drop in rankings for that page. The best practice is to finalize your slug before publishing and treat it as permanent afterward. If you absolutely must change a slug (for rebranding or correcting a major error), always create a 301 (permanent) redirect from the old URL to the new one. In Apache, this goes in .htaccess: Redirect 301 /old-slug /new-slug In nginx: rewrite ^/old-slug$ /new-slug permanent; In Next.js, add it to next.config.js: async redirects() { return [{ source: '/old-slug', destination: '/new-slug', permanent: true }]; } For e-commerce sites, product slugs often include the product name and sometimes a category or brand identifier: /shoes/nike-air-max-90-white or /nike-air-max-90-white. Including category hierarchy in the URL provides additional context for search engines and users. However, deep nesting (/category/subcategory/sub-subcategory/product-name) makes URLs long, fragile, and hard to maintain. If you reorganize categories, every URL in the old structure breaks. A flatter structure (/product-name or /brand/product-name) is easier to maintain long-term. Programmatic slug generation is essential for sites with user-generated content. Forum posts, wiki articles, marketplace listings, social media profiles, and event pages all need slugs generated from user input. The generator needs to handle edge cases gracefully: titles that are entirely special characters or emojis (produce an empty string after stripping), titles that are only numbers ("42"), titles with extremely long text (truncate to a reasonable length), titles that start or end with separator characters, and titles in mixed scripts (English words with Chinese characters interspersed). Robust slug generation has fallback behavior for each of these cases. For static site generators like Astro, Hugo, Eleventy, and Gatsby, slugs are typically derived from the file name or a frontmatter field. If your file is named 2026-03-21-image-optimization.md, the generated URL will be /blog/image-optimization or /blog/2026/03/image-optimization depending on your permalink configuration. Keeping your file names clean and consistent from the start prevents URL problems when you build and deploy. URL structure for multilingual sites requires extra slug planning. There are three common approaches. Subdirectory-based: /en/image-compressor, /de/bildkompressor, /tr/resim-sikistirma. Each language has its own slug translated into the target language. This provides the best SEO for each language market because the URL contains local-language keywords. Subdomain-based: en.example.com/image-compressor, de.example.com/bildkompressor. This keeps each language isolated but adds DNS and SSL complexity. Language-neutral slugs: /en/image-compressor, /de/image-compressor, /tr/image-compressor. The slug stays the same English keyword across all languages. This is simpler to implement but sacrifices keyword relevance in non-English markets. The slug generator helps with all three approaches by converting titles in any language into URL-safe strings. For API endpoint design, slugs serve as human-readable resource identifiers. Instead of /api/v1/users/a3f8c2d1-4e5b-6789, you might use /api/v1/users/john-doe or /api/v1/products/blue-cotton-shirt. Slug-based APIs are easier to debug, easier to discuss in team communication, and produce more readable logs. The trade-off is that slugs must be unique within their scope and may need updating if the underlying entity's name changes (while UUIDs never change). Many APIs expose both: the UUID for programmatic access and the slug for human-friendly URLs. Content migration is one of the most common scenarios where slug generation matters at scale. When migrating a blog from WordPress to Ghost, from Drupal to Next.js, or from any legacy CMS to a modern one, you need to ensure that every page's slug matches the old URL structure or that proper redirects are in place. Running all old titles through a consistent slug generator and comparing the output with the existing URLs identifies mismatches that need redirect rules. Slug collision detection becomes important at scale. A site with 10,000 products may have multiple items that generate similar or identical slugs. "Blue Cotton T-Shirt (Men's)" and "Blue Cotton T-Shirt (Women's)" both become "blue-cotton-t-shirt" after stripping the parenthetical. Collision resolution strategies include appending a disambiguator (blue-cotton-t-shirt-mens, blue-cotton-t-shirt-womens), appending the product ID (blue-cotton-t-shirt-1234), or including a parent category (mens/blue-cotton-t-shirt, womens/blue-cotton-t-shirt). Choose a strategy before you generate slugs at scale. Testing slugs before deploying content is a good habit. Paste your generated slug into a browser address bar appended to your domain and verify it resolves correctly. Check that your web server, CMS, or framework handles the slug without errors. Some servers are case-sensitive (Linux) while others are not (Windows IIS). If your slug generator always outputs lowercase (which it should), this is not an issue, but it is worth verifying during initial setup. Slug generation for structured data and breadcrumbs also matters. Google uses URL structure to infer breadcrumb hierarchy in search results. A URL like /blog/web-development/optimize-images gives Google a clear signal that "Optimize Images" is a child of "Web Development" which is a child of "Blog." This hierarchical structure appears in your search result snippet as breadcrumbs: Blog > Web Development > Optimize Images. Clean, descriptive slugs at each level make these breadcrumbs informative and clickable. Framework-specific slug handling varies. In Next.js, file-based routing uses the file name as the slug: pages/blog/[slug].tsx matches /blog/any-slug. In Gatsby, slugs are typically generated from frontmatter or file paths during the build process. In WordPress, the slug is a database field that defaults to a sanitized version of the title but can be manually edited. In Django, the SlugField model field validates that values contain only letters, numbers, hyphens, and underscores. Understanding how your framework handles slugs helps you configure the generator output to match expectations. Slug validation is an important step that slug generation alone does not cover. After generating a slug, validate it against reserved words and paths in your application. Common reserved words include "admin," "api," "login," "register," "settings," "profile," "search," "help," "about," "contact," "blog," and "null." If a user creates a blog post titled "Admin Tips," the generated slug "admin" would conflict with your admin panel route. Maintain a blocklist of reserved slugs and append a disambiguator when a collision is detected. Slug encoding in different contexts requires awareness. In HTML anchor tags, slugs appear in the href attribute and need no extra encoding if they contain only valid URL characters. In JavaScript, use encodeURIComponent() only for query parameter values, not for slugs in the path (since slugs already contain only URL-safe characters). In database queries, treat slugs as regular string parameters with proper parameterization to prevent SQL injection. In API responses, slugs should be returned as-is without additional encoding since they are already URL-safe by definition. Slugs and anchor links (hash fragments) work together for long-form content. A page at /web-development-guide might have sections accessible via /web-development-guide#html-basics, /web-development-guide#css-fundamentals, /web-development-guide#javascript-intro. The section anchors should follow the same slug formatting rules: lowercase, hyphenated, no special characters. Consistent anchor formatting improves both the user experience (predictable URLs) and SEO (Google sometimes displays anchor links as sitelinks in search results). The relationship between slugs and canonical URLs is direct. Your canonical URL (specified via the rel="canonical" link tag) should use the same slug format as your primary URL. If your page is accessible at both /Image-Compressor and /image-compressor due to case-insensitive server routing, the canonical tag should point to the lowercase version, which matches your generated slug. Inconsistencies between the visible URL, the canonical URL, and internal links create duplicate content signals that dilute your SEO authority. Performance impact of slug structure is minimal but worth noting. Shorter URLs are marginally faster to resolve because they require less data transmission in the HTTP request. More importantly, clean slugs without query parameters are more likely to be cached by CDNs and browser caches. URLs with query parameters (?id=47&sort=date) are sometimes treated as uncacheable by default, while clean slug-based URLs (/blog/optimize-images) are cached normally. This can reduce server load and improve page load times for returning visitors. For blog posts and articles, including the publication year in the slug or URL path (/blog/2026/optimize-images) helps with content freshness signals and lets you publish updated versions of the same topic in future years without slug conflicts. However, dates in URLs can make evergreen content look stale. A post from 2024 with a URL containing /2024/ may be perceived as outdated in 2026, even if the content is still accurate. Consider whether your content is time-sensitive or evergreen when deciding on date inclusion. Slug generation is a small but foundational piece of web development and content management. Getting it right from the start saves you from URL migration headaches, redirect chains, broken backlinks, and SEO problems down the road. The slug generator handles the conversion automatically, supporting diacritics from dozens of languages, multiple separator options, and real-time preview. Type your title, copy the slug, and use it in your CMS, routing configuration, static site generator, or API endpoint definition.Frequently asked questions
What is a URL slug?
A slug is the URL-friendly version of a title, like "my-blog-post" instead of "My Blog Post!". The tool generates them instantly.
Does it handle non-English characters?
Yes. The tool converts accented characters like ü, ñ, ç into their ASCII equivalents automatically.
