This is the gold standard. While they host the complete Arabic text and partial English translations, they have a dedicated section for Tafsir al-Mizan and Majma’ al-Bayan.
Warning: The internet is full of low-quality scans, incomplete drafts, or PDFs infected with malware. For a legitimate, clean, and accurate English PDF of Volume 39, follow these reliable sources: Majma 39- Al-bayan English Pdf
The original Arabic of Majma’ al-Bayan spans roughly 10 dense volumes (or 5 large double-volumes). Translating such a work is a monumental task. This is the gold standard
The most significant effort to date has been spearheaded by the Al-Mustafa International Translation and Publication Center (based in Qom, Iran). Over the last two decades, they have released several volumes of Majma’ al-Bayan in English. Iran). Over the last two decades