No legal free PDF exists online. However, you can obtain a of the English translation. The best version is:
: If you're unable to find a free PDF, consider purchasing a copy from an online bookstore or requesting it through an interlibrary loan service at a library. Mantra Mahodadhi English Translation Pdf
However, there is a significant caveat: It assumes knowledge of Sanskrit phonetics, Tantric cosmology, and guru initiation ( diksha ). Many mantras within it are bija (seed) mantras that should never be chanted without proper guidance. No legal free PDF exists online
Mantra Mahodadhi (The Great Ocean of Mantras) Original Author: Mahidhara Translator: Notably translated by scholars such as Dr. R.L. Dwivedi or localized by Raghunātha Prasāda (Varanasi editions). Genre: Tantra Śāstra / Hindu Ritual Manual Mantra Mahodadhi English Translation Pdf