Thanks @BrunaErlandsson and @Anjum. We don’t have specific recommendations for where you place a DOI in a PDF. That said, you can view the entire display guidelines here: https://www.crossref.org/display-guidelines/
PDFs are mentioned below, but, like I said, we don’t have rigid guidelines for the location on or within a PDF:
An obligation of membership is that Crossref DOIs must be displayed on members’ response pages (also called landing pages). We recommend that Crossref DOIs also be displayed or distributed in the following contexts:
- Tables of contents
- Full text HTML and PDF articles, and other scholarly documents
- Citation downloads to reference management systems
- Metadata feeds to third parties
- “How to Cite This” instructions on content pages
- Social network links
- Anywhere users are directed to a permanent, stable, or persistent link to the content
And, as a reminder, the guidelines are designed to meet these four goals:
- To make it as easy as possible for users without technical knowledge to cut and paste or click to share Crossref DOIs (e.g. using right click to copy a URL).
- To get users to recognize a Crossref DOI as both a persistent link as well as a persistent identifier, even if they don’t know what a DOI is.
- To enable points 1 and 2 above by having all Crossref members display DOIs in a consistent way.
- To enable robots and crawlers to recognize Crossref DOIs as URLs.
So, @Anjum’s recommendation is a good one! Thanks again!