What’s a professional photographer without a portfolio? What about an artist, agency, or freelance writer? With content creation comes the task of displaying your work online in order to find the best-fitting clients. A portfolio serves as your first line of offense. A place to show the best of the best. A hub to say exactly which types of niches you focus on. An easy way to build a portfolio is to find a portfolio, photo gallery or image gallery app. PDF Catalog.