| Cover | Feb. 28, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 28, 2024 |
| Entity Registrant Name | Squarespace, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-40393 |
| Entity Tax Identification Number | 20-0375811 |
| Entity Address, Address Line One | 225 Varick Street |
| Entity Address, Address Line Two | 12th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10014 |
| City Area Code | 646 |
| Local Phone Number | 580-3456 |
| 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 | SQSP |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001496963 |
| Amendment Flag | false |
