Which letters are converted?

All nine Polish diacritic letters in both cases: ą to a, ć to c, ę to e, ł to l, ń to n, ó to o, ś to s, ź to z and ż to z. Every other character is left untouched.

Why not just use Unicode normalization?

A standard NFD normalize strips combining accents, but ł is a precomposed letter with a stroke, not a base plus a combining mark, so normalization leaves it unchanged. This tool uses an explicit map so ł correctly becomes l.

Do both ź and ż become z?

Yes. Both map to z because z is their shared base letter, even though ź carries an acute and ż carries an overdot. This matches how Polish text is usually transliterated for ASCII systems.

Is this good for URLs and slugs?

It is a solid first step. After removing diacritics you typically lowercase the text and replace spaces with hyphens to build a clean URL slug.

Is my text sent anywhere?

No. The replacement runs entirely in your browser with a built-in lookup table, so your text never leaves the page.

Polish Diacritic Remover

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Polish uses nine letters with diacritics — ą ć ę ł ń ó ś ź ż — that many older systems, URLs, and filenames cannot handle. This tool replaces each of them with its plain Latin base letter so you get clean ASCII text in one step.

How it works

Every character is checked against a fixed map. Accented letters are replaced with their base; everything else passes through unchanged:

ą → a   ć → c   ę → e   ł → l   ń → n
ó → o   ś → s   ź → z   ż → z

The map covers uppercase letters too (Ą → A, Ł → L, and so on). A plain Unicode normalize("NFD") would miss ł, because it is a single precomposed code point rather than a base letter plus a combining stroke. The explicit table here handles it correctly.

Example and notes

The classic pangram Zażółć gęślą jaźń becomes Zazolc gesla jazn. Use the output as the basis for a URL slug by lowercasing and swapping spaces for hyphens, or feed it into systems that only accept 7-bit ASCII. The tool also reports how many diacritics it removed so you can sanity-check the conversion.