Cover - shares shares in Millions	6 Months Ended
	Jul. 31, 2024	Aug. 19, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jul. 31, 2024
Document Transition Report	false
Entity File Number	001-40895
Entity Registrant Name	GITLAB INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-1861035
Title of 12(b) Security	Class A common stock, par value $0.0000025per share
Trading Symbol	GTLB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Address, Address Line One	251 Little Falls Drive
Entity Address, City or Town	Wilmington
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19808
Entity Central Index Key	0001653482
Current Fiscal Year End Date	--01-31
Current Fiscal Year Focus	2025
Current Fiscal Period Focus	Q2
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		136.5
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		24.0