Number to Extenso

About This Tool

This tool converts numeric inputs into their formal written Portuguese form (extenso). It supports both pt-BR and pt-PT variants, handling integers and decimal parts. Conceptually, the process tokenizes the number, groups digits by thousands, and maps each group to the corresponding Portuguese words, inserting appropriate connectors like 'mil' and 'milhão' as needed. Decimals are read after a comma or period, with the default behavior reading each decimal digit or the entire fractional value depending on configuration. The main beneficiaries are editors, educators, translators, AI prompt engineers, and data scientists who require deterministic, human-readable representations of numbers for contracts, reports, textbooks, prompts, and multilingual content. Unique value lies in dialect-aware rules, accurate pluralization for large units, and consistent use of conjunctions across number magnitudes. Core features include: integer-to-text conversion, decimal support, negative numbers with 'menos', dialect selection, and error handling. Typical use cases include documenting numbers in legal texts, generating prompts for AI systems, teaching Portuguese numeration, and preparing datasets with spelled-out numbers.

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