Shrimad Bhagavad Gita in Tamil in PDF format for free is provided by Swami Shri Adgadanad Ji’s of Yatharth Geeta. This downloadable Tamil Bhagawad Geeta is strictly for personal use. You can only download the eighteen chapters separately and not as a single book.
The Bhagavad Gita is in PDF format and you will need Adobe Acrobat Reader installed on your computer.
You can download the Bhagavad Gita in Tamil from this link – Tamil Bhagavad Gita.
Note - it seems the Yatharth Geeta website is facing some technical difficulties and is being restored slowly. So the download link might not work for sometime.
Update - The site is now working properly.