Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 12, 2019
Document and Entity Information [Abstract]    
Entity Registrant Name Nxt-ID, Inc.  
Entity Central Index Key 0001566826  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Document Type 10-Q  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Entity Filer Category Non-accelerated Filer  
Entity Ex Transition Period false  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 000-54960  
Entity Interactive Data Current Yes  
Entity Incorporation, State or Country Code DE  
Entity Common Stock, Shares Outstanding   29,720,134