Title → URL-safe string

When to use it

Turning a blog title into a URL slug, normalizing repo names, cleaning up filenames in bulk — "Hello World — first post!" becomes hello-world-first-post or hello-world-first depending on what you want to keep.

Options

• Separator — - or _. Hyphens are the SEO standard for URLs.
• Lowercase — useful when the target system treats casing as significant.
• Strip accents — NFD decomposition then drops combining marks, so é → e, ü → u. Helpful for European languages.
• ASCII only — replaces every non-ASCII character with the separator. Off by default — it's lossy. Turn it on only when you need to feed a legacy system that can't handle Unicode.
• Max length — 0 = unlimited. Trailing separator is cleaned up after slicing.

ASCII vs Unicode

Modern browsers and servers accept https://blog.example/한글-슬러그 directly, and search engines often match Unicode slugs to local queries. Use ASCII mode only when an external integration (email, older servers) chokes on Unicode paths.