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Cover - USD ($) $ in Billions	12 Months Ended
Cover - USD ($) $ in Billions	Dec. 31, 2024	Feb. 05, 2025	Jun. 28, 2024
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
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	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Documents Incorporated by Reference	Portions of the registrant’s definitive Proxy Statement for the registrant’s 2025 Annual Meeting of Stockholders, which will be filed with the Securities and Exchange Commission within 120 days of the fiscal year ended December 31, 2024, are incorporated by reference in Part III of this Annual Report on Form 10-K.
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Entity Central Index Key	0001713445
Amendment Flag	false
Entity Public Float			$ 10.4
Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		125,531,501
Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		55,372,848