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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 21, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2023    
Document Fiscal Year Focus 2023    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Annual Report true    
Entity File Number 001-39062    
Entity Registrant Name Korro Bio, Inc.    
Entity Central Index Key 0001703647    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 47-2324450    
Entity Address, Address Line One One Kendall Square    
Entity Address, Address Line Two Building 600-700    
Entity Address, Address Line Three Suite 6-401    
Entity Address, City or Town Cambridge    
Entity Address, State or Province MA    
Entity Address, Postal Zip Code 02139    
City Area Code 617    
Local Phone Number 468-1999    
Title of 12(b) Security Common stock, par value $0.001 per share    
Trading Symbol KRRO    
Security Exchange Name NASDAQ    
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 Emerging Growth Company true    
Document Transition Report false    
Entity Small Business true    
Entity Ex Transition Period false    
Entity Shell Company false    
Document Financial Statement Error Correction [Flag] false    
ICFR Auditor Attestation Flag false    
Entity Public Float     $ 12,148,224
Entity Common Stock, Shares Outstanding   8,021,946  
Auditor Firm ID 42    
Auditor Name Ernst & Young LLP    
Auditor Location Boston, Massachusetts