Cover - USD ($)	12 Months Ended
	Dec. 31, 2021	Mar. 17, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	We are filing this Amendment to include the information required by Part III and not included in the Original Form 10-K, because we will not file our definitive proxy statement within 120 days of the end of our fiscal year ended December 31, 2021. This information was previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K, which permits the information in the above referenced items to be incorporated in our Form 10-K by reference from our definitive proxy statement if such statement is filed no later than 120 days after our fiscal year-end. The reference on the cover page of the Original Form 10-K to our incorporation by reference of certain sections of our definitive proxy statement into Part III of the Original Form 10-K is hereby deleted.
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2021
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
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			$ 12,681,000
Entity Common Stock, Shares Outstanding		67,495,055
Auditor Name	Morison Cogen LLP
Auditor Location	Blue Bell, Pennsylvania
Auditor Firm ID	536