Cover - USD ($)	12 Months Ended
	Dec. 31, 2023	Mar. 11, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Current Fiscal Year End Date	--12-31
Entity File Number	000-20333
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
Title of 12(g) Security	Common Stock, Par Value $0.01
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 18,570,000
Entity Common Stock, Shares Outstanding		10,501,178
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Auditor Name	Morison Cogen LLP
Auditor Firm ID	536
Auditor Location	Blue Bell, Pennsylvania