v3.26.3
Cover
 6 Months Ended
Jun. 30, 2026
Entity Addresses [Line Items]  
Document Type S-1
Amendment Flag false
Entity Registrant Name NOCOPI TECHNOLOGIES, INC.
Entity Central Index Key 0000888981
Entity Tax Identification Number 87-0406496
Entity Incorporation, State or Country Code MD
Entity Address, Address Line One 480 Shoemaker Road
Entity Address, Address Line Two Suite 104
Entity Address, City or Town King of Prussia
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19406
City Area Code 610
Local Phone Number 834-9600
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false
Business Contact [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One 480 Shoemaker Road
Entity Address, Address Line Two Suite 104
Entity Address, City or Town King of Prussia
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19406
City Area Code 610
Local Phone Number 834-9600
Contact Personnel Name Matthew C. Winger