Navkar Mantra with pronunciation:

णमो अरिहंताणं Namō Arihantāṇam

णमो सिद्धाणं Namō Siddhāṇam

णमो आयरियाणं Namō Āyariyāṇam

णमो उवज्झायाणं Namō Uvajjhāyāṇam

णमो लोए सव्वसाहूणं Namō Loe Savva Sāhūṇam

एसो पंच नमोक्कारो Eso Pancha Namokkāro

सव्वपावप्पणासणो Savva Pāvappaṇāsano

मंगलाणं च सव्वेसिं Mangalāṇam Cha Savvesim

पढमं हवइ मंगलं Padhamam Havai Mangalam

If you want, I can also give the meaning of the Navkar Mantra in simple language.