Unicode Normalizer | NFC NFD NFKC NFKD Text Converter

Unicode normalizer converts text between NFC, NFD, NFKC, and NFKD forms and shows codepoint, UTF-16, and UTF-8 counts, so lookalike strings stop breaking equality checks.

Also known as: unicode normalizer · unicode normalization tool · nfc nfd nfkc nfkd converter · normalize unicode text online · unicode form converter · string normalize online · combining characters converter

text tools

encoding and decoding tools

file converters

utilities

Text Input

Primary output form

NFC is what most systems expect (the web, most databases). NFD is used internally by macOS filenames. The K forms also fold typographic variants like ligatures and full-width characters.

NFC Output

Enter text and press Normalize to compare all four Unicode normalization forms

About Unicode Normalizer

Convert text between the four Unicode normalization forms (NFC, NFD, NFKC, NFKD) and see exactly how codepoint count, UTF-16 length, and UTF-8 byte size change for each. Useful for tracking down 'identical looking but not equal' string bugs.

Key Features

Computes all four normalization forms at once using the browser's native String.normalize(), so results match what Node.js, Python, and every other spec-compliant implementation produce
Shows codepoint count, UTF-16 code unit length, and UTF-8 byte size per form, plus whether each form actually changed the input
Flags precomposed versus combining-character text, the most common cause of two visually identical strings failing a strict equality check

Use Cases

Debug a string comparison, search, or database unique constraint that fails on text that looks identical on screen
Normalize user input (usernames, filenames, search queries) to NFC before storing or comparing it
Understand why a filename copied from macOS (which uses NFD) doesn't match the same name typed on Windows or Linux

Related Keywords

unicode normalizer

unicode normalization tool

nfc nfd nfkc nfkd converter

normalize unicode text online

unicode form converter

string normalize online

combining characters converter

Client-side only

Normalization runs via the browser's built-in String.normalize(). Your text is never sent to a server.

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Frequently asked questions

What is Unicode Normalizer used for?

Unicode normalizer converts text between NFC, NFD, NFKC, and NFKD forms and shows codepoint, UTF-16, and UTF-8 counts, so lookalike strings stop breaking equality checks.

Is Unicode Normalizer free to use?

Yes. Unicode Normalizer is completely free with no usage limits, and there is no paid tier required to use it.

Do I need an account to use Unicode Normalizer?

No. Unicode Normalizer works immediately in your browser with no signup, login, or email address required.

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