v3.26.3
Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2026
Nov. 02, 2026
Document Information Line Items    
Entity Central Index Key 0002033807  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Sep. 30, 2026  
Document Fiscal Year Focus 2026  
Document Transition Report false  
Entity File Number 001-42529  
Entity Registrant Name FRANKLIN CRYPTO TRUST  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 99-6871401  
Entity Address, Address Line One One Franklin Parkway  
Entity Address, City or Town San Mateo,  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94403  
City Area Code 650  
Local Phone Number 312-2000  
Title of 12(b) Security Franklin Crypto Index ETF Shares  
Trading Symbol EZPZ  
Security Exchange Name CboeBZX  
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   850,000
Amendment Flag false  
Document Fiscal Period Focus Q3  
Current Fiscal Year End Date --12-31