Text to Slug: What Makes a Good URL Slug for SEO
Every blog post, product page, and article needs a clean URL — and that URL almost always comes from turning a title into a "slug": lowercase, hyphenated, free of special characters. Getting this right matters more than it seems, both for SEO and for avoiding broken links down the line.
What Is a URL Slug?
A slug is the part of a URL that identifies a specific page in readable form — for example, in seostacktools.com/how-to-check-dns-records, the slug is how-to-check-dns-records. A good slug is short, descriptive, lowercase, and uses hyphens rather than spaces or underscores.
How Text Becomes a Slug
Converting a title into a slug generally involves:
- Converting all letters to lowercase
- Replacing spaces with hyphens
- Removing special characters (apostrophes, punctuation, symbols)
- Collapsing multiple consecutive hyphens into one
- Trimming leading and trailing hyphens
For example, "What's the Best SEO Tool in 2026?" becomes whats-the-best-seo-tool-in-2026.
Why Slug Quality Matters for SEO
Search engines and users both benefit from a clean, descriptive URL. A slug like /how-to-check-dns-records tells both a search engine and a human what the page is about before they even click. A slug like /post?id=48291 tells them nothing. Descriptive slugs are also more likely to include relevant keywords naturally, which is a minor but real on-page SEO signal.
Slug Best Practices
- Keep it reasonably short — long slugs get truncated in search results and are harder to share
- Avoid stop words where possible ("a," "the," "of") to keep it tight, though this is a style choice, not a hard rule
- Never change an existing page's slug without setting up a 301 redirect from the old URL — otherwise you lose any existing search ranking and break external links
- Stick to lowercase letters, numbers, and hyphens only — avoid underscores, which some search engines treat differently than hyphens
How to Generate a Slug
- Open the Text to Slug tool
- Paste your title or phrase
- Copy the generated, URL-ready slug
Frequently Asked Questions
Should I use hyphens or underscores in a slug?
Hyphens. Google has historically treated hyphens as word separators but underscores as joining characters (so "seo_tools" may be read as one word "seotools" rather than two), making hyphens the safer, standard choice.
What happens if I change a page's slug after it's already indexed?
The old URL will 404 unless you set up a 301 redirect to the new URL. Without a redirect, you lose accumulated search ranking on that URL and break any existing external links or bookmarks.
Should slugs include numbers or dates?
It depends on the content — for evergreen content, avoid dates in the slug since they can make content look outdated even after updates. For genuinely time-specific content, a date can be appropriate.
