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Cover - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 28, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 000-56267    
Entity Registrant Name SEZZLE INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 81-0971660    
Entity Address, Address Line One 251 N 1st Avenue    
Entity Address, Address Line Two Ste. 200    
Entity Address, City or Town Minneapolis    
Entity Address, State or Province MN    
Entity Address, Postal Zip Code 55401    
Country Region +1    
City Area Code 651    
Local Phone Number 504 5402    
Title of 12(g) Security Common Stock, par value $0.00001 per share    
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 true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 582,910,693
Entity Common Stock, Shares Outstanding   204,409,961  
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE
None.
    
Entity Central Index Key 0001662991    
Amendment Flag false    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Auditor Firm ID 23