v3.26.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 31, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Current Fiscal Year End Date --12-31    
Entity File Number 000-55964    
Entity Registrant Name Quarta-Rad, Inc.    
Entity Central Index Key 0001549631    
Entity Tax Identification Number 45-4232089    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 1201 N. Orange St.    
Entity Address, Address Line Two Suite 700    
Entity Address, City or Town Wilmington    
Entity Address, State or Province DE    
Entity Address, Postal Zip Code 19801    
City Area Code (302)    
Local Phone Number 887-9916    
Title of 12(b) Security Common Stock, par value $0.0001 per share    
Trading Symbol QURT    
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     $ 444,492
Entity Common Stock, Shares Outstanding   15,899,483  
Document Financial Statement Error Correction [Flag] false    
Auditor Name dbbmckennon    
Auditor Firm ID 3501    
Auditor Location San Diego, California