Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 23, 2020
Jun. 30, 2019
Cover [Abstract]      
Entity Registrant Name QS Energy, Inc.    
Entity Central Index Key 0001103795    
Document Type 10-K    
Document Period End Date Dec. 31, 2019    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Is Entity's Reporting Status Current? Yes    
Entity Filer Category Non-accelerated Filer    
Entity Common Stock, Shares Outstanding   311,505,883  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Entity Small Business true    
Entity Emerging Growth false    
Entity Interactive Data Current Yes    
Entity Incorporation State Country Code NV    
Entity File Number 000-29185    
Entity Well Known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 65,049,000
Entity Shell Company false