v3.22.2.2
Cover - USD ($)
 12 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Annual Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2022  
Document Fiscal Period Focus FY  
Document Fiscal Year Focus 2022  
Current Fiscal Year End Date --09-30  
Entity File Number 333-261614  
Entity Registrant Name WELSIS CORP.  
Entity Central Index Key 0001887912  
Entity Tax Identification Number 98-1620699  
Entity Incorporation, State or Country Code WY  
Entity Address, Address Line One Bulevar Mihajla Pupina 115  
Entity Address, City or Town Belgrade  
Entity Address, Country RS  
Entity Address, Postal Zip Code 11070  
Country Region 1  
City Area Code 385  
Local Phone Number 5009709  
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 true  
Elected Not To Use the Extended Transition Period true  
Entity Shell Company false  
Entity Public Float   $ 0
Entity Common Stock, Shares Outstanding 2,752,667  
Auditor Name BF Borgers CPA PC  
Auditor Firm ID 5041  
Auditor Location Lakewood, CO