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Cover Page
Nov. 26, 2025
Nov. 06, 2023
Cover [Abstract]    
Document Type   8-K
Document Period End Date Dec. 03, 2025  
Entity Registrant Name   FASTLY, INC.
Entity Central Index Key   0001517413
Amendment Flag   false
Entity Incorporation, State or Country Code   DE
Entity File Number   001-38897
Entity Tax Identification Number   27-5411834
Entity Address, Address Line One   475 Brannan Street, Suite 300
Entity Address, City or Town   San Francisco
Entity Address, State or Province   CA
Entity Address, Postal Zip Code   94107
City Area Code   844
Local Phone Number   432-7859
Written Communications   false
Soliciting Material   false
Pre-commencement Tender Offer   false
Pre-commencement Issuer Tender Offer   false
Title of 12(b) Security   Class A Common Stock, $0.00002 par value
Trading Symbol   “FSLY”
Security Exchange Name   NASDAQ
Entity Emerging Growth Company   false