How to Generate a URL Slug From a Title (Including Vietnamese)

A blog post title, a product name, a page heading — turning it into a clean URL slug (my-blog-post-title instead of My Blog Post Title!) is something every CMS does automatically, until you need to generate one manually, or the automatic version mangles non-English text. Here's how slug generation actually works, and where it commonly goes wrong.

What Makes a Slug "Clean"

A URL-safe slug is lowercase, uses only letters, numbers, and a single separator character (usually a hyphen), and has no repeated or trailing separators. Getting from "Hello, World! This Is a Title." to hello-world-this-is-a-title means: lowercase everything, replace every run of non-alphanumeric characters with the separator, and trim any separator left dangling at the start or end.

The Vietnamese Problem

This is where a lot of slug generators quietly fail. Standard accent-stripping works by decomposing a character like "à" into its base letter ("a") plus a separate "combining accent mark," then dropping the accent mark — leaving "a." That works for most diacritics. It does not work for "đ" (and its uppercase "Đ"), because in Vietnamese, đ is its own distinct letter, not a "d" with an accent mark attached. Standard decomposition leaves đ completely untouched, and a slug generator that doesn't handle it explicitly ends up either keeping the raw đ character in the slug (breaking URL-safety) or dropping it as an unrecognized character (losing content).

QR Ivify's Slug Generator handles đ/Đ explicitly, converting them to d/D before the rest of the accent-stripping runs — so Vietnamese titles produce a correct, readable slug instead of a broken or lossy one.

Step by Step

1. Open the Slug Generator.
2. Type or paste a title.
3. Choose a hyphen or underscore as the separator.
4. The slug updates live — copy it once it looks right.

A Worked Example

Input: Xin chào các bạn! Đây là 100% Test.

Output: xin-chao-cac-ban-day-la-100-test

Every Vietnamese diacritic is stripped to its base Latin letter, "Đây" correctly becomes "day" (not "ây" or a broken character), the percent sign and punctuation become separators, and the whole thing collapses to one clean, readable slug.

Frequently Asked Questions

Does this handle Vietnamese titles correctly? Yes — Vietnamese diacritics (including "đ," which isn't just an accented "d") are correctly transliterated to plain ASCII letters rather than dropped or garbled.

Can I use an underscore instead of a hyphen? Yes — hyphens are the more common convention for URLs, but underscores are supported too.

What happens to numbers? Numbers are kept as-is — only letters and numbers survive; everything else becomes a separator.

Does this upload my text anywhere? No. The slug is generated entirely in your browser.

Try It

Need a clean URL slug from a title — including one with Vietnamese text? QR Ivify's free Slug Generator handles diacritics correctly. Need the title's word count for an SEO check too? Try Word Counter.