For those who prefer a physical book, several prominent Bengali publishers offer the complete text: Navabharat Publishers : They offer a hardbound version of the Agni Puranam translated into Bengali , often spanning over 700 pages. Arya Mission Institution
If you want a searchable PDF, you must use the Sanskrit version (Devanagari script) or a Hindi translation, which have been OCR'd. For Bengali, you must manually scroll. agni puran bengali pdf