PDF File Versions

How do I change the PDF version?

The PDF version tag is set according to the features used when you create a PDF.
For example:
  • A basic PDF with no advanced features used will likely be 1.4
  • Adding an advanced feature, such as layers, means the version tag updates to 1.7
  • Removing layers from the PDF would change the version tag back to 1.4
PDF creation tools will always try to use the lowest PDF version for compatibility reasons.
You can change the PDF version tag in a PDF, say 1.4 to 2.0, but it is just a tag and won't change the PDF itself in any meaningful way, it won't add or enable new features.
For this reason, IronPdf doesn't have a method of setting or overriding the PDF version tag.