The document presents a simple and robust digital image watermarking technique against salt and pepper noise using repetition codes. It embeds an encoded watermark image into the cover image pixels by replacing the least significant bit. The watermark is first encoded using (7,4) Hamming code or (3,1) and (5,1) repetition codes. The encoded bits are then embedded into the cover image using least significant bit substitution. Experimental results show that encoding the watermark with (5,1) repetition code provides better robustness against salt and pepper noise compared to other encoding schemes, without degrading the cover image quality significantly. The proposed technique is simple to implement and offers improved performance for copyright protection of digital images.