| Cover | Feb. 14, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 14, 2024 |
| Entity Registrant Name | NERDWALLET, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40994 |
| Entity Tax Identification Number | 45-4180440 |
| Entity Address, Address Line One | 55 Hawthorne Street |
| Entity Address, Address Line Two | 10th Floor |
| Entity Address, City or Town | San Francisco |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94105 |
| City Area Code | 415 |
| Local Phone Number | 549-8913 |
| 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, $0.0001 par value |
| Trading Symbol | NRDS |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Amendment Flag | false |
| Entity Central Index Key | 0001625278 |
| Entity Ex Transition Period | false |
