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Cover - USD ($)
12 Months Ended
Dec. 31, 2023
Feb. 23, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
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 700 Nicollet Mall    
Entity Address, Address Line Two Suite 640    
Entity Address, City or Town Minneapolis    
Entity Address, State or Province MN    
Entity Address, Postal Zip Code 55402    
Country Region +1    
City Area Code 651    
Local Phone Number 504 5294    
Title of 12(b) Security Common Stock, par value $0.00001 per share    
Security Exchange Name NASDAQ    
Trading Symbol SEZL    
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    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 36,764,617
Entity Common Stock, Shares Outstanding   5,633,172  
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE
The information required by Part III of this Annual Report on Form 10-K, to the extent not set forth herein, is incorporated herein by reference from the registrant’s definitive proxy statement for its 2024 Annual Meeting of Stockholders. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2023.
   
Entity Central Index Key 0001662991    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY