Unicode Normalizer

The Unicode Normalizer is a browser-based tool for applying NFC, NFD, NFKC, and NFKD to text so you can inspect strings that appear identical but are stored with different internal code point sequences. This matters in many real workflows: search indexes, deduplication, user ID matching, filename cleanup, imported CSV or JSON records, validation pipelines, and text comparison tools can behave unexpectedly when one string uses composed characters while another uses decomposed sequences.

Compatibility normalization adds another layer, because full-width letters, circled numbers, ligatures, half-width kana, and other compatibility characters may need to be unified before matching or analysis. This tool lets you paste text, switch normalization forms instantly, compare the resulting output, and check how code-unit length, code-point count, and UTF-8 byte count change after normalization. That makes it useful for debugging data issues, preparing text for consistent storage, cleaning user input, standardizing content before slug generation or keyword matching, and understanding why seemingly equal strings fail equality checks.

Everything runs locally in the browser, so sensitive text remains on your device. The normalized result can be copied to the clipboard or downloaded as a text file, making it easy to transfer the output to other systems or services for validation and processing.