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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2025
Feb. 04, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
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 001-41983    
Entity Registrant Name Reddit, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 45-2546501    
Entity Address, Address Line One 303 2nd Street    
Entity Address, Address Line Two South Tower    
Entity Address, Address Line Three 5th Floor    
Entity Address, City or Town San Francisco    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94107    
City Area Code 415    
Local Phone Number 494-8016    
Title of 12(b) Security Class A common stock, par value $0.0001 per share    
Trading Symbol RDDT    
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     $ 21.2
Documents Incorporated by Reference
Portions of the registrant’s definitive Proxy Statement for the registrant’s 2026 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days of the fiscal year ended December 31, 2025, are incorporated by reference in Part III of this Annual Report on Form 10-K.
    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
CIK 0001713445    
Amendment Flag false    
Class A      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   139,649,508  
Class B      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   51,386,276  
Class C      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   0