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Cover Page
 12 Months Ended
Dec. 31, 2021
shares
Document Information [Line Items]  
Entity Registrant Name KANZHUN LIMITED
Entity Central Index Key 0001842827
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Document Period End Date Dec. 31, 2021
Amendment Flag false
Document Fiscal Year Focus 2021
Document Fiscal Period Focus FY
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company true
Entity Shell Company false
Entity Interactive Data Current Yes
Entity File Number 001-40460
Entity Incorporation, State or Country Code E9
Entity Ex Transition Period false
Entity Address, Address Line One 18/F, GrandyVic Building
Entity Address, Address Line Two Taiyanggong Middle Road
Entity Address, Address Line Three Chaoyang District
Entity Address, City or Town Beijing
Entity Address, Postal Zip Code 100020
ICFR Auditor Attestation Flag false
Document Accounting Standard U.S. GAAP
Entity Address, Country CN
Auditor Name PricewaterhouseCoopers Zhong Tian LLP
Auditor Firm ID 1424
Auditor Location the People’s Republic of China
Business Contact [Member]  
Document Information [Line Items]  
Contact Personnel Name Yu Zhang
Entity Address, Address Line One 18/F, GrandyVic Building
Entity Address, Address Line Two Taiyanggong Middle Road
Entity Address, Address Line Three Chaoyang District
Entity Address, City or Town Beijing
Entity Address, Postal Zip Code 100020
City Area Code 86
Local Phone Number 10-8462-8340
Entity Address, Country CN
Contact Personnel Email Address ir@kanzhun.com
American Depositary Shares [Member]  
Document Information [Line Items]  
Title of 12(b) Security American depositary shares (each ADS represents two of our Class A ordinary shares, par value US$0.0001 per share)
Trading Symbol BZ
Security Exchange Name NASDAQ
Common Class A [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 727,855,233
Title of 12(b) Security Class A Ordinary Shares, par value US$0.0001 per share
Security Exchange Name NASDAQ
No Trading Symbol Flag true
Common Class B [Member]  
Document Information [Line Items]  
Entity Common Stock, Shares Outstanding 140,830,401