For best results, we recommend uploading a JPG or PNG file at 150 dpi. We allow any JPG, PNG, GIF, TIF, AI, EPS, or SVC file under 40 MB.
While we can accept AI, EPS and SVC files, we strongly recommend against it. When you upload a Vector file (AI, EPS, or SVC), we convert it to a PNG. During the conversion process a vector file can change--transparent areas become un-transparent, fonts change, or unintended lines appear. If you export the file from Illustrator as a JPG or PNG before submitting it to Spoonflower, you have more control over how the file will look and you don't lose any quality.