Specifications:
- Podcast cover must be shaped Square 
- Recommended size 3000 x 3000 pixels. (No less than 1400 x 1400 pixels). 
- RGB color. 
- File format JPG or PNG. 
- File size no larger than 500KB. 
Recommended software: CANVA
We've written a complete guide & tips for designing your podcast cover art:
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