GemBox.Pdf vs Spire.PDF

GemBox.Pdf

Figure	GemBox.Pdf	Spire.PDF
Price from	—	Free
Free plan	—	Yes
Free trial	—	Yes
Open source	—	—
Web	—	Yes
Windows	Yes	Yes
macOS	Yes	Yes
Linux	Yes	Yes
iOS	Yes	Yes
Android	Yes	Yes
API	—	Yes
Self-hosted	Yes	Yes
Plans published	3	3
Spec score · PDF SDKs	8.1 (#10)	7.9 (#15)
Conversion	It converts PDF files to PNG, JPEG, GIF, BMP, TIFF, WMP, and XPS formats, and supports HTML-to-PDF conversion.	The vendor lists PDF conversions to Word, Excel, PowerPoint, images, HTML, Markdown, XPS, SVG, TIFF, PCL, PostScript, and PDF/A, and conversions from text, images, TIFF, XPS, SVG, and HTML to PDF.
Headquarters	Zagreb, Croatia	The vendor's contact page lists its address in Chengdu, Sichuan, China.
Product	GemBox.Pdf is a .NET component for reading, writing, editing, and printing PDF files from .NET applications.	Spire.PDF for .NET is a PDF API for creating, writing, editing, handling, and reading PDFs from .NET applications.
Security features	It supports PDF encryption and decryption, editing restrictions, and digital signatures, including visible, multiple, and external signatures.	PDF security features include encryption and decryption, passwords, permission restrictions, and digital signatures.
Support	Paid licenses include one year of professional technical support with a one-business-day response time and one year of updates and bug fixes.	The vendor provides free online technical resources, and listed paid-support licenses include one-on-one support from an expert and faster guaranteed response times.

GemBox.Pdf has no write-up on Specifiction yet; its figures are above.

Spire.PDF has no write-up on Specifiction yet; its figures are above.