| Cover Page | Feb. 25, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Feb. 25, 2021 |
| Entity Registrant Name | ETSY INC |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36911 |
| Entity Tax Identification Number | 20-4898921 |
| Entity Address, Address Line One | 117 Adams Street |
| Entity Address, City or Town | Brooklyn |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 11201 |
| City Area Code | 718 |
| Local Phone Number | 880-3660 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.001 par value per share |
| Trading Symbol | ETSY |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001370637 |
| Amendment Flag | false |
| Document Fiscal Period Focus | FY |
| Document Fiscal Year Focus | 2020 |
