URL Slug

A slug is the readable part of a URL — the words that tell a visitor and a search engine what a page or link actually leads to, instead of a meaningless string of letters and numbers.

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Definition

A URL slug is the human-readable, final segment of a web address that identifies a specific page, post, product or resource. It sits after the domain name and any folder structure, written in plain words, usually lowercase and separated by hyphens rather than spaces or underscores.

In a long-form website URL such as example.com/blog/url-slug-guide, the slug is url-slug-guide. In a branded short link such as yourbrand.com/spring-sale, the slug is spring-sale — in URL shortening this same concept is often called a custom alias or custom back-half, but it serves exactly the same purpose: replacing an unreadable, randomly generated identifier with words a human can read, remember and trust.

Why Slugs Matter

A slug does three jobs simultaneously, which is why it deserves more thought than it usually gets:

• Communicates relevance before the click. In a search results page, a social media bio, or a printed flyer, a descriptive slug tells the reader what they will find at the destination — increasing the likelihood they click through, and reducing the likelihood they click through expecting something they don't get.
• Gives search engines an additional relevance signal. Search engine crawlers parse the words in a URL path alongside the page title, headings and body content. A slug containing the primary topic of the page in plain language reinforces the same relevance signal the rest of the page is already sending — it does not replace good content, but it does not hurt, and a slug full of database parameters or randomly generated characters wastes this signal entirely.
• Builds trust and memorability. A slug that reads as a real phrase — rather than an opaque token — signals legitimacy to a cautious visitor, and a short, memorable slug can be recalled and typed directly into a browser without needing to find the original link again.

What Makes a Good Slug

Slug vs Permalink vs Custom Alias

These three terms overlap heavily and are often used interchangeably, but come from slightly different contexts:

• Slug — the readable final segment of a URL path, the term most commonly used in content management systems such as WordPress for the editable part of a post or page URL.
• Permalink — the complete, permanent URL of a page, of which the slug is one component. "Permalink" emphasises the URL's role as a stable, lasting address; "slug" refers specifically to the readable text portion within it.
• Custom alias (or custom back-half) — the term most often used in URL shortening platforms, including Cuttly, for the user-chosen text that replaces a randomly generated short code. Functionally identical to a slug: a short, readable, hyphenated identifier that the user defines rather than the system generating automatically.

Common Slug Mistakes

• Keyword stuffing. Cramming multiple target keywords into a single slug — buy-cheap-best-running-shoes-online-sale — reads as spam to both visitors and search engines, and provides no additional ranking benefit over a clean, specific slug.
• Including dates that will become stale. A slug like top-10-tools-2024 signals outdated content once the year has passed, even if the page content itself is updated; many publishers prefer evergreen slugs without a year, updating the page content while leaving the slug unchanged.
• Changing a slug after it has been shared. Once a slug has been indexed by search engines, shared on social media, printed on physical materials or included in an email campaign, changing it breaks every one of those references unless a 301 redirect is configured from the old slug to the new one.
• Using auto-generated IDs instead of words. Database-driven slugs like /product/48217 are functional but communicate nothing to a human reader and carry no search relevance signal — a missed opportunity compared with /product/wireless-keyboard.

Custom Slugs for Short Links in Cuttly

When shortening a link in Cuttly, the platform generates a random short code by default — for example cutt.ly/3xK9pQa. Entering text into the custom alias field replaces this random code with a slug of your choice, producing a link such as cutt.ly/your-chosen-slug or, on a connected branded custom domain, yourbrand.com/your-chosen-slug.

Cuttly checks alias availability on the selected domain before the link is created, since a slug must be unique within that domain. A well-chosen alias is particularly valuable for links that will appear in printed materials, be read aloud in video or audio content, or be shared in contexts where the underlying destination URL is long, contains tracking parameters, or is otherwise unsuitable for direct display.

Related Terms

• Link Alias (Slug)
• Vanity URL
• Short Link Readability
• Branded Links
• Canonical URL