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Cover - shares
 3 Months Ended
Mar. 31, 2024
May 03, 2024
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2024  
Document Transition Report false  
Entity File Number 001-41781  
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 240 6001  
Title of 12(b) Security Common Stock, par value $0.00001 per share  
Trading Symbol SEZL  
Security Exchange Name NASDAQ  
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  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   5,667,389
Entity Central Index Key 0001662991  
Amendment Flag false  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q1  
Current Fiscal Year End Date --12-31