If you are looking for a solution to export Yahoo to PDF, then, I would recommend using the MacSonik Yahoo backup tool for Mac. This is an advanced software equipped with various beneficial features to provide a safer and hassle-free migration of Yahoo emails. It maintains data security and originality throughout the migration process. The Yahoo backup tool removes any duplicate emails during the migration process without any data loss. Users can export/migrate Yahoo emails to PST, EML, MBOX, Gmail, Office 365, AOL, and other various file formats and email clients. 

Follow the below steps to export Yahoo mail to PDF 

1. Run the Yahoo backup tool 
2. Enter Yahoo credentials and click Sign in.
3. Choose PDF as the saving file format.
4. Click Convert to initiate the conversion process. 

Visit - https://www.macsonik.com/yahoo/backup/