Lord Vishnu is considered as the chief god in Hindu religion and Indian mythology. Vishnu, the preserver, forms the part of trinity gods. Vishnu Slokas form the part of prayers offered to the lord. Vishnu Slokas/ Shlokas are as follows:

"Kaayena Vaachaa Manasendriyairvaa
Buddhyaatmanaa Vaa Prakriteh Svabhaavaatah
Karomi Yadhyadh Sakalam Parasmai
Naaraayanaayeti Samarpayaami"

Meaning: The literal meaning of the mantra is: "I offer everything to Lord Vishnu (Narayana); whatever I do with my body, words, mind, limbs, intellect or my inner self whether intentionally or unintentionally. I bow to the great lord, Vishnu".

"Shaantaakaaram Bhujanga Shayanam Padmanaabham Suresham
Vishvaadhaaram Gagana Sadrisham Meghavarnam Shubhaangam
Lakshmiikaantam Kamalanayanam Yogibhidhyaarnagamyam
Vande Vishhnum Bhavabhayaharam Sarvalokaikanaatham"

Meaning: Lord Vishnu is the personification of peace, who rests on the Shesha Naag. The Narayana, from whose navel the Lotus springs and whose complexion is swarthy like the clouds. The God, who is the beloved of Goddess Lakshmi, whose body shines with divine splendor and whose eyes are like Lotus. I bow to the lord, Vishnu Narayana, who is meditated upon by the yogis and who is the remover of the fear of the world-cycle.

Source : Iloveindia