A URL slug is the human-readable part of a URL that identifies a specific page, e.g. "my-blog-post" in "example.com/blog/my-blog-post". Good slugs are short, lowercase, and use hyphens as word separators.

Why must slugs be lowercase?

Most web servers treat URLs as case-sensitive. Mixed-case slugs can result in duplicate content issues and broken links when capitalization is inconsistent.

Can a slug contain underscores?

Google treats underscores as part of a word, not a word separator, which can hurt SEO. Hyphens are the universally recommended separator.

How long should a slug be?

Keep slugs under 75 characters. Shorter is usually better — aim for the core keyword phrase without stop words like "a", "the", or "and".

Are numeric-only slugs valid?

They are technically valid but carry no keyword signal. A slug like "123" is not descriptive for users or search engines. Add a descriptive word alongside the number when possible.

URL Slug Validator

Name: URL Slug Validator
Availability: InStock
Author: Nham Vu

Paste any URL slug and instantly see whether it follows best practices, with actionable fix suggestions.

Enter a Slug

Type or paste a slug — results update instantly.

Try an example

Enter a slug on the left to see results.

Summary

Paste any URL slug and instantly see whether it follows best practices, with actionable fix suggestions.

How it works

Type or paste your slug into the input field.
The tool evaluates it against 10+ rules in real time.
Each failing rule is listed with a plain-English explanation.
A auto-corrected slug is generated and displayed below the results.
Copy the corrected slug with one click.

Use cases

Validate slugs before publishing a blog post or CMS page.
Check auto-generated slugs from third-party plugins.
Ensure SEO-safe URLs across a content migration.
Teach junior developers what makes a good slug.
Audit existing URLs for slug hygiene issues.
Generate a corrected slug from a messy title string.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu