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Method and example
NFC canonically decomposes then composes; NFD canonically decomposes. NFKC and NFKD additionally apply compatibility decomposition, with NFKC composing afterward.
NFD changes precomposed é (U+00E9) to e (U+0065) plus U+0301. NFC composes that canonical sequence back when supported.
Scope and Unicode semantics
Compatibility forms can remove meaningful presentation distinctions such as width or superscript styling. Normalization is applied only on this page after an explicit action and is never silently applied elsewhere.
All user content is rendered as inert text. The tools do not provide impersonation, domain spoofing, moderation bypass, or credential-disguise features.
Accessibility and privacy
Glyph appearance is never the only label: results include descriptive names, categories, or code points. Controls are keyboard operable and status updates occur after deliberate search or transformation actions.