What Is a URL Slug?
A URL slug is the trailing segment of a web address that identifies a specific page. In https://example.com/blog/how-to-build-rest-apis, the slug is how-to-build-rest-apis. Slugs appear in blog posts, product pages, documentation sites, and any URL structure designed to be human-readable.
The term “slug” comes from newspaper jargon, where a slug was a short label used to identify a story during editing. In web development, the concept is the same: a compact, descriptive string that represents the content of a page.
A well-crafted slug follows a few rules: lowercase only, words separated by hyphens, no special characters, no filler words when possible, and short enough to read at a glance. This tool automates all of that — paste any text and get a production-ready slug instantly.
How to Generate a URL Slug
- Paste your text into the input area — a blog post title, product name, heading, or any phrase.
- Adjust settings if needed — choose hyphen or underscore separator, set a max length, or toggle stop-word removal.
- Press
Ctrl+Enteror click the Slugify button. The slug appears in the output. - Copy the result with the Copy button or
Ctrl+Shift+C.
The tool converts as you type (debounced), so you can iterate on a title and see the slug update in real time.
What Makes a Good Slug
Not all slugs are created equal. Compare these two URLs for the same blog post:
example.com/blog/10-tips-for-writing-clean-python-code— clear, descriptive, keyword-richexample.com/blog/10-tips-for-writing-clean-python-code-that-you-should-definitely-start-using-today— too long, diluted keywords
A good slug is descriptive (tells the reader what the page is about), concise (under 60 characters when possible), keyword-forward (the important words come first), and clean (no stop words like “the”, “a”, “and” unless they’re essential to meaning).
This tool handles the mechanical part — lowercasing, special-character removal, separator insertion, and Unicode transliteration — so you can focus on choosing the right words.
Slugs and SEO
Search engines use the URL slug as a lightweight ranking signal. Google’s own documentation confirms that “the URL of a document is displayed as part of a search result” and recommends using “words that are relevant to your site’s content.”
Here’s what matters:
- Keywords in the slug — a slug like
/tools/json-formatterreinforces the page’s topic. Keep the primary keyword in the slug. - Hyphens, not underscores — Google treats hyphens as word separators.
json-formatteris two words;json_formatteris treated as one compound token. - Stability — changing a slug after publication breaks existing links and resets any authority the URL has accumulated. Get the slug right before you publish. If you must change it, set up a 301 redirect from the old URL.
- Lowercase — URLs are technically case-sensitive on most servers. Mixing cases leads to duplicate-content issues if both
/Blog/My-Postand/blog/my-postresolve. Always use lowercase.
Common Slug Mistakes
Including dates in the slug — /blog/2026/06/16/my-post dates the content and makes it look stale. Unless your content is genuinely time-sensitive (news, event coverage), omit the date from the slug. You can still display the publication date on the page itself.
Leaving in stop words — “a”, “the”, “is”, “and”, “of” add length without adding meaning. /blog/the-ultimate-guide-to-the-basics-of-rest-apis → /blog/rest-api-basics-guide.
Using IDs or hashes — /product/48271 or /p/a3f8c2 tells neither humans nor search engines what the page is about. If your CMS defaults to numeric IDs, override the slug manually.
Special characters and encoding — café-latte looks fine in the address bar but the é gets percent-encoded to caf%C3%A9-latte in some contexts, which is ugly and error-prone. Transliterate to ASCII: cafe-latte.
Double separators — my--post---title usually results from lazy find-and-replace. This tool collapses consecutive separators automatically.
Slug Generation in Different Platforms
| Platform | Default slug behavior | Notes |
|---|---|---|
| WordPress | Auto-generates from post title, hyphens, lowercase | Editable in the post editor |
| Next.js | File-name-based routing (pages/my-post.tsx → /my-post) | Dynamic routes use [slug].tsx |
| Hugo | Generated from filename or slug frontmatter field | Customizable via permalinks config |
| Django | SlugField model field + slugify() template filter | Manual or auto via django-autoslug |
| Rails | No built-in slug — use friendly_id gem | Stores slug in a dedicated column |
| Gatsby | Generated from file path or frontmatter slug | Configured in gatsby-node.js |
Regardless of platform, the rules for a good slug are the same. Use this tool to preview and refine the slug before entering it into your CMS.
Slug Generator vs Other Tools
- This tool — zero-install, instant, browser-based. Handles Unicode transliteration, stop-word removal, and max-length truncation. Best for quick copy-paste workflows.
slugify(npm) — the most popular JS slug library (2M+ weekly downloads). Handles transliteration via@sindresorhus/transliterate. Best for programmatic use in Node.js.- Python
python-slugify— handles Unicode well viatext-unidecode. Best for Django/Flask projects. - Your CMS — WordPress, Ghost, and most headless CMS platforms generate slugs automatically. Best when you trust the defaults and just need to spot-check.
Use this tool when you want to preview the slug before it hits your CMS, when you’re building URLs manually (documentation sites, static generators), or when you need to slugify a batch of titles at once.