Which letters does it convert?

It maps the Finnish special letters to ASCII: a-umlaut becomes a, o-umlaut becomes o, a-ring becomes a, and u-umlaut becomes u. A few foreign letters seen in names (e-acute, s-caron, z-caron) are also folded so mixed text comes out clean ASCII.

Is it safe to use this on real Finnish words?

No. In Finnish, a-umlaut and o-umlaut are separate letters with their own sounds, not accents on a and o. Stripping them changes meaning: tällä (with this) becomes talla, a different word. Use this only for ASCII-only systems, never to respell Finnish.

When should I use it?

Use it when a system cannot handle Finnish letters: building a URL slug, a safe filename, an email local-part, or feeding a legacy database or API that is ASCII-only. The display text for human readers should keep the original letters.

Does it change uppercase and lowercase?

No. Case is preserved, so an uppercase a-umlaut becomes an uppercase A and a lowercase one becomes a lowercase a. Only the diacritic mapping is applied; spacing and punctuation are untouched.

No. All conversion happens locally in your browser. Nothing is sent to a server, so the tool is safe for private or unpublished content.

Finnish Diacritic Remover

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This tool converts Finnish text to plain ASCII for systems that cannot handle the letters ä, ö, å, or ü. It is a compatibility helper, not a spelling tool.

How it works

The remover walks through your text character by character and replaces each special letter with its closest ASCII equivalent, leaving everything else unchanged:

ä → a   Ä → A
ö → o   Ö → O
å → a   Å → A
ü → u   Ü → U

Case is preserved and the rest of the text — spaces, digits, punctuation — passes through untouched. A few non-Finnish letters that often appear in imported names (é, š, ž) are also folded so the output is reliably ASCII.

Important note on Finnish letters

In Finnish, ä and ö are full letters of the alphabet with their own pronunciation, not accented variants of a and o. Removing them genuinely changes words: säde (ray) versus sade (rain), or tällä versus talla. So use ASCII output only where the system demands it — URL slugs, filenames, legacy databases — and always keep the original spelling for anything a person reads.

Tips and notes

å (the “Swedish o”) appears in Finnish almost only in Swedish loan words and place names such as Åland; folding it to a is fine for ASCII keys. To understand why these letters sort at the very end of the Finnish alphabet, see the Finnish alphabetical-sort tool.