Ramayana in Tamil in pdf is the version written by Dr.J.Perumal. You can download the Tamil Ramayan at vedpuran.net for free. It is published online by the author. The size of the pdf file is 5 MB.
The link opens to a pdf file. It might take several minutes or hours depending on your net connect speed to open the file. You can then save it.
Link – Ramayana in Tamil in pdf