About

This tool transforms raw text into clean, URL-friendly slugs used in modern web development and SEO. A slug is the part of a URL that identifies a specific page in a human-readable format. For example, converting "How to & code!" into "how-to-and-code".

The conversion process follows a strict pipeline: Normalization (handling accents like é → e), Transliteration (expanding symbols like $ → dollar), and Sanitization (removing unsafe characters). This ensures your URLs are compatible with RFC 3986 standards, safe for browsers, and optimized for search engine indexing.

Formulas

The core logic relies on Unicode Normalization Form Canonical Decomposition (NFD) combined with Regular Expressions.

slug(S) = trim(replace(normalize(S), /[^a-z0-9]/g, sep))

Where S is the input string and sep is the chosen separator (usually -). The normalization step separates diacritics from letters:

normalize("é") = { "e", "\u0301" }

Reference Data

Original Character	Slugified Result (Standard)	Slugified Result (Strict/German)
Spaces	- (hyphen)	- (hyphen)
CamelCase	camel-case	camel-case
Schön	schon	schoen
Straße	strasse	strasse
$ 100	dollar-100	dollar-100
C#	c-sharp	c-sharp
100%	100-percent	100-percent
file.txt	file-txt	file-txt

Frequently Asked Questions

URLs have a limited character set (ASCII). Special characters like accents, emojis, or punctuation can cause encoding errors (resulting in ugly URLs like %20%F0). We remove or transliterate them to ensure the link works universally.

The algorithm uses a regex pattern /-+/g to detect consecutive separators and collapses them into a single instance. For example, "foo---bar" automatically becomes "foo-bar".

Yes. It attempts to transliterate common Cyrillic, Greek, and other characters into their Latin equivalents. Characters that cannot be transliterated are typically removed to preserve URL safety.

Standard mode simply strips accents (ü -> u). Strict mode (often used in German or Nordic contexts) transliterates them phonetically (ü -> ue, ä -> ae) to preserve meaning.