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SetaPDF-Signer is a PHP class library that allows developers to digitally sign PDF documents. It provides a simple and secure way to add electronic signatures to PDF files.

Key Features:

  1. Digital Signing: Allows developers to digitally sign PDF documents using various signature formats, including PAdES, CMS, and PKCS#7.
  2. Certificate Management: Provides certificate management features, including certificate selection, validation, and revocation checking.
  3. PDF Manipulation: Offers PDF manipulation features, such as adding text, images, and annotations to PDF documents.
  4. Encryption: Supports encryption of PDF documents, ensuring that signed documents remain secure and tamper-proof.
  5. Compliance: Meets various industry standards and regulations, including PDF/A, PDF/E, and ZUGFeRD.


  1. Easy Integration: Is easy to integrate into existing applications, allowing developers to quickly add digital signing capabilities.
  2. Secure Signing: Provides secure signing of PDF documents, ensuring the authenticity and integrity of electronic signatures.
  3. Customization: Offers customization options, allowing developers to tailor the signing process to their specific needs.
  4. Compliance: Meets various industry standards and regulations, ensuring that signed documents are compliant with relevant laws and regulations.
  5. PHP Compatibility: Is compatible with PHP, making it easy to use in web applications