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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Feb. 23, 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 001-40994    
Entity Registrant Name NerdWallet, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 45-4180440    
Entity Address, Address Line One 19 S. B Street    
Entity Address, Address Line Two Suite 9    
Entity Address, City or Town San Mateo    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94401    
City Area Code 415    
Local Phone Number 549-8913    
Title of 12(b) Security Class A common stock, $.0001 par value    
Trading Symbol NRDS    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 349
Documents Incorporated by Reference
Portions of the registrant’s definitive proxy statement for its 2026 Annual Meeting of Stockholders (the “Proxy Statement”), to be filed within 120 days of the registrant’s fiscal year ended December 31, 2025, are incorporated by reference in Part III of this Annual Report on Form 10-K. Except with respect to information specifically incorporated by reference in this Annual Report on Form 10-K, the Proxy Statement is not deemed to be filed as part of this Annual Report on Form 10-K.
    
Amendment Flag false    
Central Index Key 0001625278    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Common Class A      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   35,100,146  
Common Class B      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   31,685,652