Answer
The best type of file for large-format printing is a vector-based file. If you are uploading artwork such as a business logo or custom design, a vector file is recommended. This will generally be an original design file such as an .EPS, .AI, or even a .PDF saved out of the original design program. Vector files maintain quality at any size.
If you are uploading an image or photo, we recommend locating the largest-size file with the highest-resolution you can find. You can check image resolution by right-clicking on the file name and selecting “Properties.” Under the “Details” tab look for resolution—we recommend at least 300 dpi.
For more information about file types, please review this article about
The Best Design File Type for Signs and Banners.