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Last Updated: November 14, 2026 Quick Summary To create a photo collage shirt online, choose a custom photo collage t-shirt or all-over print photo t-shirt, then upload 15 to 20 photos through our online photo uploader or by email. Arrange your collage and add text, then review the hand-made mockup our team sends before printing. Both shirt options are made from 100% polyester. We suggest uploading 15 to 20 photos for a collage. Decide on a square, portrait, or landscape layout early. Zoom in …