Which marks does this remove?

It removes all five Vietnamese tone marks (acute, grave, hook above, tilde, dot below) and the base-vowel modifications â, ê, ô, ă, ơ, and ư. It also maps đ to d. The result is pure ASCII A–Z.

How does the stripping work?

The text is Unicode-decomposed into base letters plus combining marks, the combining marks are deleted, and the special letter đ is mapped separately since it does not decompose. This is more reliable than a fixed character lookup.

Will it change the meaning of my text?

Removing tone marks discards meaning, since Vietnamese relies on diacritics to distinguish words. The output is for technical use such as usernames and URLs, not for human reading. Keep the original for actual content.

What is the slug output for?

The slug lowercases the ASCII, replaces runs of non-alphanumeric characters with hyphens, and trims edge hyphens. It produces a clean, URL-safe identifier suitable for web addresses and file names.

No. All processing uses your browser's built-in Unicode functions locally. Nothing you paste leaves your device, so it is safe for private names and data.

Vietnamese Tone Mark Stripper

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This tool converts accented Vietnamese into plain ASCII by removing every tone mark and vowel modification. It is built for technical contexts — usernames, filenames, email handles, and URL slugs — where diacritics cause problems.

How it works

Vietnamese diacritics fall into two groups: the five tone marks and the base vowel modifications such as the circumflex (â ê ô), breve (ă), and horn (ơ ư). The tool first decomposes the text into base letters plus separate combining marks using Unicode NFD normalization, then deletes all combining marks. Because the letter đ does not decompose into d plus a mark, it is mapped explicitly. The remaining characters are recomposed into clean ASCII.

Example and notes

Tiếng Việt becomes Tieng Viet, and Đà Nẵng becomes Da Nang. The slug output additionally lowercases the result and joins words with hyphens, so Hồ Chí Minh yields ho-chi-minh. Remember that stripping tones removes meaning — má, mà, mả, mã, and mạ all collapse to ma — so use the output only for identifiers, never as a replacement for the original Vietnamese.