Free URL Slug Generator — 8 Formats, Stop Words & Custom Separator (2026)

What Is a URL Slug and Why Does It Matter?

Definition

A URL slug is the human-readable segment at the end of a web address that identifies a specific page. In the URL https://example.com/blog/seo-guide, the slug is seo-guide. Slugs replace raw IDs and query strings with descriptive words, making links easier to read, share, and rank.

Slug vs Query String — A Concrete Example

Slug Format Comparison

Different contexts call for different slug formats. Use this table to pick the right format for your use case.

SEO Best Practices for URL Slugs

• 1
  Use hyphens, not underscores. Google treats hyphens as word separators, soseo-guide is read as two keywords. Underscores join words, so seo_guide reads as one token.
• 2
  Keep slugs under 5 words. Shorter slugs are easier to read, remember, and share. They also fit cleanly in search result snippets without truncation.
• 3
  Use lowercase only. Mixed-case slugs risk duplicate content — some servers treat/Blog/SEO-Guide and/blog/seo-guide as different pages.
• 4
  Remove stop words. Words like "the", "of", "and", "a" add length without SEO value. Enable stop word removal to get a tighter, more keyword-dense slug automatically.
• 5
  Include your primary keyword. Place the most important keyword near the beginning of the slug so it appears prominently in search result URLs and anchor text.

How to Use This Slug Generator — Step by Step

1. 1
   Paste or type your text into the input area — a blog title, product name, heading, or any phrase you want to turn into a URL slug.
2. 2
   Adjust options as needed: choose your custom separator (hyphen, underscore, or dot), toggle lowercase conversion, and enable stop word removal for cleaner slugs.
3. 3
   Review the 8 generated formats — each card shows the slug, its character count, and a description of when to use it. The kebab-case card also shows a live URL preview.
4. 4
   Copy the slug you need with the copy icon on each card, or use "Copy All" to grab all 8 formats as a numbered list for comparison or documentation.
5. 5
   Download if needed — each format has a download button that saves the slug as a plain-text .txt file, useful for batch work or sharing with a team.

Frequently Asked Questions

• What is a URL slug and why does it matter?

  A URL slug is the human-readable portion of a web address that identifies a specific page — for example, the 'seo-guide' part in '/blog/seo-guide'. Slugs matter because they improve SEO ranking, make URLs easier to read and share, and signal page content to both users and search engines. A clean, keyword-rich slug can meaningfully boost click-through rates in search results.

• Which slug format is best for SEO?

  Kebab-case (words separated by hyphens, all lowercase) is the universally recommended format for SEO. Google explicitly states it treats hyphens as word separators, which allows search engines to understand each word in your URL independently. Avoid underscores for public URLs — Google treats them as joining characters, making 'seo_guide' read as one word rather than two.

• Should I use hyphens or underscores in URL slugs?

  Always prefer hyphens for public-facing URLs. Google treats hyphens as word separators, so 'seo-guide' is understood as two keywords ('seo' and 'guide'). Underscores join words together, so 'seo_guide' is treated as a single token. Underscores are fine for programming identifiers and file names where search engine visibility is not a concern.

• What are stop words and should I remove them from slugs?

  Stop words are common words like 'a', 'the', 'of', 'and', 'in', and 'for' that carry little semantic meaning. Removing them from slugs keeps URLs shorter, cleaner, and more keyword-focused. For example, 'guide-to-the-best-seo-tools' becomes 'guide-best-seo-tools'. However, keep stop words if they are integral to the meaning or if the slug would otherwise be confusing without them.

• How long should a URL slug be?

  Aim for slugs between 3 and 5 words (roughly 20–60 characters). Shorter slugs are easier to read, remember, and share — and many SEO professionals consider excessive length a minor negative signal. Focus on including your primary keyword and dropping filler words. A slug like 'javascript-array-methods' is ideal; 'the-complete-list-of-all-javascript-array-methods-in-2026' is too long.

• What characters are not allowed in URL slugs?

  Slugs should only contain letters (a–z), numbers (0–9), and hyphens or underscores as separators. Characters like spaces, ?, #, %, &, =, +, /, and most punctuation marks must be percent-encoded or avoided entirely. Special characters can break links, cause redirect issues, and confuse analytics tools. This slug generator automatically strips unsafe characters for you.

• Can I use uppercase letters in URL slugs?

  While URLs technically support uppercase letters, it is strongly advised to use all-lowercase slugs for public pages. Uppercase characters can cause duplicate content issues — '/Blog/SEO-Guide' and '/blog/seo-guide' are treated as different URLs by some servers, potentially splitting link equity. The lowercase setting in this tool is enabled by default for this reason.

• How does a slug generator work?

  A slug generator takes raw text input, strips invalid characters (punctuation, symbols), optionally removes stop words, converts spaces to a separator character (hyphen, underscore, etc.), and applies case normalization. Advanced generators like this one also offer multiple output formats — kebab-case for URLs, snake_case for file names, camelCase for JavaScript variables, and more — all generated simultaneously from a single input.

• Should I change existing slugs for better SEO?

  Changing live slugs is risky and generally not recommended unless the existing slug is genuinely problematic (e.g., contains random IDs or very thin keywords). If you do rename a slug, always set up a 301 permanent redirect from the old URL to the new one to preserve link equity and prevent broken links. Missing redirects can cause significant ranking drops and user-experience issues.

• What is the difference between a slug and a permalink?

  A slug is the last segment of a URL path — the human-readable identifier for a specific page (e.g., 'seo-guide'). A permalink is the complete, permanent URL including protocol, domain, and the full path (e.g., 'https://example.com/blog/seo-guide'). Every permalink contains a slug, but a slug alone is not a full URL. WordPress and other CMS platforms use these terms in their URL settings.

• Do URL slugs affect Google search rankings?

  Yes, URL slugs are a lightweight but real ranking signal. Google uses the words in your URL to understand page content, and a keyword-matching slug can contribute to relevance scoring. More importantly, readable slugs improve click-through rates in search results — users are more likely to click '/how-to-bake-sourdough' than '/p?id=8821'. Higher CTR sends positive engagement signals back to Google.

• Is this slug generator free to use?

  Yes, this URL Slug Generator is completely free. It runs entirely in your browser — no account required, no data is sent to a server, and there are no usage limits. You can generate slugs in all 8 formats (kebab-case, snake_case, camelCase, PascalCase, dot.case, UPPER-KEBAB, Title Case, and custom) for unlimited text inputs at no cost.