Slug Generator

How the Slug Generator Works

Type or paste any text and the slug updates in real time. The generator applies a five-step pipeline: normalize accents using Unicode NFD decomposition (é → e, ç → c), convert to lowercase, replace spaces and underscores with your chosen separator, remove any remaining non-alphanumeric characters, then clean up consecutive separators and trim from the edges.

Choose between three separator styles: hyphen (-) for SEO-friendly blog URLs, underscore (_) for file names and database identifiers, or dot (.) for versioning and file extension schemes. The "Remove numbers" toggle strips all digits from the output — useful when you want purely word-based slugs regardless of numbers in the source text.

What Is a Slug?

A slug is the human-readable part of a URL that identifies a specific page or resource. The term comes from newspaper publishing, where a slug was the short name given to a story for internal reference. In web development, a slug is the URL-safe version of a title or name: lowercase, using only ASCII letters, numbers, and hyphens (or underscores), with no spaces or special characters.

CMS platforms like WordPress, Shopify, Ghost, and Webflow all use slugs to build page URLs. Blog post titles, product names, category labels, and author names are all typically slugified when added to a URL. Having clean, readable slugs also improves SEO: search engines can infer page content from the URL keywords, and users are more likely to click a URL they can understand.

Hyphen vs Underscore vs Dot — Which Should You Use?

Google officially treats hyphens as word separators in URLs, making them the best choice for public-facing blog posts and pages. A URL like /my-blog-post is read as three separate words: 'my', 'blog', 'post'. Underscores are treated as part of a word by Google — /my_blog_post is read as a single term 'myblogpost', which can hurt keyword matching in search results.

Underscores are still common in non-SEO contexts: Python module names, database column names, file system names, and internal identifiers. Dots appear in file extensions, API versioning (/api/v1.2), and some CDN configurations. For any URL that users will see in the browser address bar, use hyphens.

When to Use a Slug Generator

Use a slug generator when creating blog post URLs, CMS entries, product pages, API endpoints, Git branch names, or any identifier that must be safe for URLs. A good slug is lowercase, uses hyphens as separators (not underscores — Google treats hyphens as word separators but underscores as connectors), contains no special characters, and is meaningful to humans and search engines.

Related tools: Case Converter, URL Encoder, Lorem Ipsum Generator, Markdown Table Generator.

URL Slug Best Practices

Length: 3–5 words is the practical sweet spot for blog posts and landing pages. Google truncates long URLs in search result snippets at roughly 60–70 characters (including the domain and path prefix), so a slug like /the-definitive-ultimate-comprehensive-guide-to-building-better-url-slugs-for-seo loses most of its keywords in the visible SERP display. Conversely, a slug of just one or two characters (e.g., /a/ or /x/) gives Google nothing to infer from — and looks suspicious to users who scan URLs before clicking.

Stop words: removing them is common practice but not always beneficial. Dropping 'the', 'a', 'and', 'of', and 'to' often makes slugs tighter — /guide-password-managers instead of /a-guide-to-password-managers. But removing stop words can also make slugs ambiguous or hard to read: /how-fix-broken-pipe reads unnaturally compared to /how-to-fix-a-broken-pipe. Prioritize readability when in doubt; stop-word removal is a minor signal, not a rule.

Case sensitivity: URLs are technically case-sensitive on Unix/Linux servers. /Blog-Post and /blog-post are different URLs, and if your server returns content at both, you have a duplicate content problem. Always use all-lowercase slugs and configure your server to redirect uppercase variants to their lowercase equivalents. CMS platforms like WordPress and Shopify enforce lowercase automatically; custom implementations must handle this explicitly.

Dates in slugs: avoid embedding publication dates in slugs unless the content is inherently time-sensitive (news, event listings). A slug like /seo-tips-2024 ages poorly — it signals outdated content to readers even if you update the post annually. Prefer /seo-tips and update the on-page content. The exception is evergreen comparison articles where year specificity is a feature: /best-password-managers-2025 explicitly tells searchers the review is current.

Handling Special Characters and Multilingual Slugs

The standard approach for accented characters is Unicode NFD (Normalization Form Decomposed) transliteration: NFD splits a character like é into the base letter e plus a combining acute accent mark (U+0301), then stripping all combining marks leaves just e. This handles the majority of Western European accents: é→e, è→e, ê→e, à→a, ç→c, ñ→n, ü→u, ö→o, ß→ss (German eszett is a special case where transliteration adds a letter). This generator applies NFD normalization before any other step.

Scripts outside the Latin alphabet — Cyrillic, Arabic, Chinese, Japanese, Korean — require a different approach. RFC 3492 (Punycode) allows internationalized domain names (IDNs): a domain like münchen.de becomes xn--mnchen-3ya.de in its ACE (ASCII Compatible Encoding) form. For paths and slugs, Punycode is rarely used; instead, CMS platforms and transliteration libraries map non-Latin characters to their Latin phonetic equivalents: Москва→moskva, 東京→tokyo, مرحبا→mrhba. The quality of transliteration varies widely by library and language.

Multilingual sites face a structural decision: should French content at /fr/comment-faire-du-pain use a translated slug (comment-faire-du-pain) or a transliterated version of the English slug (how-to-make-bread)? Translated slugs are better for SEO in the target language — French search queries match French URL keywords more naturally. Transliterated slugs are easier to maintain programmatically. Major CMS platforms (WordPress with Polylang, Webflow Localization) generate translated slugs by default; headless setups often default to the English slug for simplicity.

Emoji in URLs: technically possible (they percent-encode to sequences like %F0%9F%94%91), and a few novelty domains use them, but they are universally impractical for slugs. Browsers display the decoded emoji in the address bar, but screen readers, link previewers, SMS clients, and analytics tools all handle percent-encoded emoji inconsistently. Strip emoji from slugs — this generator removes them along with all other non-ASCII non-alphanumeric characters.

Slugs and SEO: What Actually Matters

URL structure is a confirmed but minor Google ranking signal. Google's John Mueller has stated publicly that URLs are a 'very small ranking factor' compared to content relevance, backlinks, and page experience signals. That said, keywords in the slug do affect two measurable outcomes: anchor text inference (when other sites link to your page without custom anchor text, the URL itself becomes the anchor text) and click-through rate (users are more likely to click a search result URL that contains the words they searched for).

Keyword stuffing in slugs is counterproductive. A slug like /best-seo-tips-seo-guide-seo-strategy-2025 looks spammy in search results and to users. Google's algorithms are sophisticated enough that repeating a keyword three times in a slug provides no benefit over including it once — and may trigger spam signals. The guideline: include the primary keyword once, naturally, and keep the rest of the slug descriptive and human-readable.

Changing an existing slug requires a permanent (301) redirect from the old URL to the new one. Without a redirect, every inbound link pointing to the old URL becomes a broken link — you lose the link equity that took months to build. 301 redirects pass roughly 90–99% of link equity (the exact percentage has varied over Google's algorithm updates). When renaming a slug, set up the redirect before publishing the change, not after — even a brief 404 window costs you crawl budget and can cause ranking drops.

Canonical handling when slugs vary: if your CMS generates both /my-post and /my-post/ (with a trailing slash), both /en/my-post and /my-post, or pagination variants like /my-post?page=2, each variant needs either a canonical tag pointing to the preferred URL or a redirect. Duplicate slug variants are one of the most common technical SEO issues on CMS-driven sites. Use this generator to standardize slug format across your site before you have hundreds of posts to retroactively fix.

Frequently Asked Questions