To get started with postcards, you've reached the right page. You can design postcards with HTML or by using Inkit's template builder which has features for fonts, colors, and image uploads. If you're looking for Inkit's Print & Mail API visit our Docs.
The back of the postcard requires either a message or content (HTML, PNG, JPEG). We don't accept PDF file types. If you choose to include content, follow the provided templates, to leave room for postage:
Although the return address is optional for postcards, we highly recommend setting one.