Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 13, 2019
Document And Entity Information    
Entity Registrant Name QS Energy, Inc.  
Entity Central Index Key 0001103795  
Document Type 10-Q  
Document Period End Date Jun. 30, 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   299,149,251
Document Fiscal Period Focus Q2  
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 0-29185