Smile has released PDFpen 6.1, an update to its all-purpose PDF editing tool for OS X. The update adds support for stamps and includes a library of standard business stamps, including “Confidential” and “Approved” among others.

In PDFpen 6.1, users can now add pop-up notes to PDF annotations such highlighting and drawing objects. Support for the new Evernote Business notebooks has also been added.

The changes in PDFpen 6.1 have also been made in PDFpenPro 6.1, the Pro version that can also convert websites into PDFs, automatically create fillable PDF forms, and construct document table of contents. In addition, PDFpenPro 6.1 adds automatic URL detection and link creation.

PDFpen 6.1 works with PDFpen for iPad and PDFpen for iPhone, allowing seamless editing across devices when used with iCloud or Dropbox storage. Users who wish to use iCloud must purchase PDFpen 6 from the Mac App Store. (Apple restricts iCloud access to applications purchased via the Mac App Store.)

PDFpen retails for US$59.95, PDFpenPro for $99.95. Family Pack licenses, which cover up to five computers in one household, are $74.95 for PDFpen and $119.95 for PDFpenPro. Office Pack licenses, which cover up to five users in an office, are $179.95 for PDFpen and $279.95 for PDFpenPro.

Upgrades from earlier versions of either application are $30, and free to users who purchased on or after Oct. 15, 2012. Upgrades from previous versions of PDFpen to PDFpenPro 6.1 are $40.

PDFpen 6.1 and PDFpenPro 6.1 require OS X 10.7 or later, and are compatible with OS X 10.9 Mavericks. Demo versions are available at . Full versions of PDFpen and PDFpenPro are also available for purchase on Apple’s Mac App Store. iCloud storage requires the Mac App Store version.