Cover	3 Months Ended
	Dec. 31, 2023 shares
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2024
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
City Area Code	385
Local Phone Number	5009709
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 Common Stock, Shares Outstanding	2,752,667