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Document and Entity Information
Nov. 10, 2025
Cover [Abstract]  
Security Exchange Name NASDAQ
Entity Address, Country DK
Amendment Flag false
Entity Central Index Key 0001800315
Current Fiscal Year End Date --12-31
Document Type 8-K
Document Period End Date Nov. 10, 2025
Entity Registrant Name GALECTO, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-39655
Entity Tax Identification Number 37-1957007
Entity Address, Address Line One 75 State Street
Entity Address, Address Line Two Suite 100
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02109
City Area Code +45
Local Phone Number 70 70 52 10
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.00001 par value per share
Trading Symbol GLTO
Entity Emerging Growth Company true
Entity Ex Transition Period false