کتاب و سنت (محدث) لائبریری‘ is a project by Majlis-e-Tahaffuz-e-Islam that has become the largest platform for Islamic books in Urdu language in the world. It provides an easy-to-use PDF format of books with subject indexes. A new book is uploaded every day, and the series has been ongoing sinceAlmost ten thousand books have been presented in PDF format, which can be read online or downloaded for free.

The books on the site are distributed into different categories, and visitors can easily find all the books related to a particular subject in its relevant category. For example, if someone wants to read a book related to children, they can click on the "Gosha-e-Atfal" category, and all the books related to children will appear. The website offers four different ways to search for any book, either by its title, author, publisher, or number. Allah has blessed all the contributors to this noble cause with immense rewards.