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Document And Entity Information - shares
 12 Months Ended
Dec. 31, 2023
Apr. 30, 2024
Document Information Line Items    
Entity Registrant Name MMTEC, INC.  
Trading Symbol MTC  
Document Type 20-F  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   199,145,041
Amendment Flag false  
Entity Central Index Key 0001742518  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Non-accelerated Filer  
Entity Well-known Seasoned Issuer No  
Document Period End Date Dec. 31, 2023  
Document Fiscal Year Focus 2023  
Document Fiscal Period Focus FY  
Entity Emerging Growth Company true  
Entity Shell Company false  
Entity Ex Transition Period false  
ICFR Auditor Attestation Flag false  
Document Registration Statement false  
Document Annual Report true  
Document Transition Report false  
Document Shell Company Report false  
Entity File Number 001-38766  
Entity Incorporation, State or Country Code D8  
Entity Address, Address Line One Room 2302, 23rd Floor  
Entity Address, Address Line Two FWD Financial Center  
Entity Address, Address Line Three 308 Des Voeux Road Central  
Entity Address, City or Town Sheung Wan  
Entity Address, Country HK  
Title of 12(b) Security Common Shares, par value $0.01  
Security Exchange Name NASDAQ  
Entity Interactive Data Current Yes  
Document Financial Statement Error Correction [Flag] false  
Document Accounting Standard U.S. GAAP  
Auditor Name Assentsure PAC  
Auditor Location Singapore  
Auditor Firm ID 6783  
Entity Address, Postal Zip Code 100027  
Business Contact    
Document Information Line Items    
Entity Address, Address Line One FWD Financial Center  
Entity Address, Address Line Two 308 Des Voeux Road Central  
Entity Address, City or Town Sheung Wan  
Entity Address, Country HK  
Contact Personnel Name Xiangdong Wen  
City Area Code +852  
Local Phone Number 36908356  
Entity Address, Postal Zip Code 100027