Fine PT-PT Web: A High-Quality 41 Billion Tokens Data Collection of the European Portuguese Web

Gonçalo Vinagre; Rui Pedro Guerra; Pedro Gomes; Miguel Moura Ramos; Duarte Miguel Alves; Afonso Simplício; Diogo Tavares; David Semedo; Daniel Gomes; João Magalhães

arXiv · 2609.07699

Fine PT-PT Web: A High-Quality 41 Billion Tokens Data Collection of the European Portuguese Web

Gonçalo Vinagre·Rui Pedro Guerra·Pedro Gomes·Miguel Moura Ramos·Duarte Miguel Alves·Afonso Simplício·Diogo Tavares·David Semedo·Daniel Gomes·João Magalhães

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Abstract

Curating Web corpora for regional language variants like European Portuguese (PT-PT) is heavily bottlenecked by dialectal overlap (mainly with PT-BR) and data processing scale. This paper presents an efficient pipeline to curate a production-ready PT-PT corpus from the Portuguese Web, spanning 411 TB of raw data from Arquivo.pt. We introduce a novel post-scraping block that removes boilerplate and line duplicates prior to filtering. This early-stage intervention increases final document yield by 19.04% by rescuing valid text that standard heuristic filters prematurely discard. Integrated with rigorous language identification, weighted fuzzy deduplication, and neural quality classification, our pipeline offers a scalable framework and a clean, representative corpus optimized for LLM pre-training.

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Gonçalo Vinagre, Rui Pedro Guerra, Pedro Gomes, Miguel Moura Ramos, Duarte Miguel Alves, Afonso Simplício, Diogo Tavares, David Semedo, Daniel Gomes, João Magalhães. 2026-09-07. Fine PT-PT Web: A High-Quality 41 Billion Tokens Data Collection of the European Portuguese Web. https://arxiv.org/abs/2609.07699

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