v3.26.1
Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Feb. 12, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K/A    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-39039    
Entity Registrant Name Cloudflare, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 27-0805829    
Entity Address, Address Line One 101 Townsend Street    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94107    
City Area Code 888    
Local Phone Number 993-5273    
Title of 12(b) Security Class A Common Stock, $0.001 par value    
Trading Symbol NET    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction Flag false    
Entity Shell Company false    
Entity Public Float     $ 35.7
Documents Incorporated by Reference None.    
Amendment Flag false    
Entity Central Index Key 0001477333    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Class A common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   317,576,096  
Class B common stock      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding (in shares)   34,404,202