The Pdf.Ninja provides a web API service for working with PDF files. This subscription is a Pro tier upgrade for your API key.

Features

• Read a PDF file from a publicly accessible URL
• Read a PDF file from a POST request
• Retrieve PDF attributes such as metadata, page size, etc.
• Retrieve PDF form fields
• Fill the form fields in a PDF file with data
• Generate images of pages in a PDF file
• Embedding images into a PDF file

The Pdf.Ninja Free tier provides a way for users to experiment with the service and determine if it is right for them, however, it has certain limitations. The Pro tier offers the following limitation extensions of the Free tier,

• Requests per key: 50 requests / 10 seconds
• Requests per IP: 50 requests / 10 seconds
• New files per key: 10 files / 10 seconds
• Maximum file size: 32 MiB
• File cache expiration: 604800 seconds
• File cache size: 50 files
• No Watermark

The PDF Forms Filler for CF7 WordPress plugin users can locate their existing key on the CF7 Integration page (Contact menu).

The PDF Forms Filler for WPForms WordPress plugin users can locate their existing key on the WPForms Settings page (WPForms menu).

The PDF Forms Filler for CF7 WordPress plugin users also have the option to use the Enterprise Extension plugin which allows one to avoid using Pdf.Ninja and do all PDF filling directly on ones web servers.