We recommend at least a 1pt line thickness to ensure quality and legibility. However, some factors, such as artwork contrast and PPI, can affect the visibility of lines.
Your artwork should be at least 300 PPI at the size you need. Watch the video and follow the steps to check your artwork's PPI. If you still aren't sure, please contact us and we'll be happy to help.
You can use the PPI (Pixels Per Inch) calculator below to determine the maximum size based on your artwork.
Related: What is your minimum font size?