The design must be unique without any trademark issues/IP concerns present.
Also, the design must be compatible with Merch by Amazon guidelines and best practices. To learn more read the following:
* Best Practices. https://merch.amazon.com/resource/201849250
* Content Policy. https://merch.amazon.com/resource/201858630
* Product Templates. https://merch.amazon.com/resource/Y…E5NLRYJG4V
* FAQs. https://merch.amazon.com/resource/201846470
From Amazon: "We want to print the best possible product for your brand. For this reason, we have developed a system that allows you to create your product design in your preferred design software. This allows you to use all the fine-tuning controls you have come to expect when creating a design.
Create your design according to the specifications listed on the product image to the right. Image specifications: 15"W x 18"H @ 300ppi (i.e. 4500 x 5400 pixels), sRGB, less than 25MB.
Alternatively, download one of our product templates to use as a guide. These files are preset to the correct design specifications.
[Note: For your reference, the product templates are attached (Adobe Illustrator, Adobe Photoshop, GIMP templates)].
How to ensure your product design will look great
CYMK: While you may design your product using RGB color space, your product will be printed using CYMK. CYMK colorspace is not as wide as RGB; for example, metallics and pastels are difficult to render in CYMK.
300 DPI resolution: Your design needs to be 300 DPI, not a lower resolution image resized to 300 DPI. Resizing will result in a pixelated, blocky print.
Less than 25MB files
Design the entire product: You are submitting an 15" x 18" rectangular artwork using our templates; however, you need to consider that your design is being printed on a product Your design should integrate into the product. Generally speaking, you want to avoid a solid rectangle filling the entire printable area. Your design should work with the product. Where possible consider the (blank) product color in your design, by making that color transparent in your artwork.
Artwork sizing and placement
While you can certainly use the entire 15" x18" in space, often customers find a print that is 18 inches to be overwhelming. By and large we find that keeping your maximum dimension to 12 inches or less results in higher conversion rates.
Be conscious of the placement of design elements and where they would appear in relation to your customer’s anatomy. Remember your designs are printed on men’s, women’s, and kids products.
Horizontally center designs visually as well as mathematically. Heavy design elements on one side can make a design feel off balance even if it is mathematically centered.
Designs typically do the best when they are placed near the top of the print area.
Types of designs/effects to avoid
Designs that look contained within a rectangular block, especially if the design does not incorporate the color of the product (taking a screen capture of a game)
Elements that subtly blend into the product color. These can print like a halo with a hard edge. Think how web safe colors have big jumps between colors.
Elements with a transparency less than 20% are likely to get lost when printing, or turn out as a solid color.
Designs that have a single, large logo as the only element of the design
Simple white products
Designs that typically sell well
Designs on dark products (our product color selector is organized based on sales)
Simple, identifiable silhouettes work well with content that has characters
Bold high contrast colors.
Larger art elements in the product design may get better response to online promotions, as subtler designs are hard to see in thumbnail views of the product