Released: Feb 27, 2026

Updates in V26.2

Fixes

• Sign document error when using Azure Key Vault: DefaultSignatureLength parameter.

Released: Dec 18, 2025

Updates in V25.12

Features

• Introduced comprehensive support for embedding digital signatures directly into raster images using steganography (LSB - Least Significant Bit technique). This method embeds signature data invisibly into image pixels, making the signature undetectable to the naked eye while maintaining image quality. The feature supports signing and verifying PNG and JPG image formats with password protection. Key benefits for developers:
  • Invisible signatures - Signatures are embedded directly into...

Released: Jul 1, 2025

Updates in V25.6

Features

• Added adaptive rendering support for Barcode and QR Code signature previews.
• Added support for rotation in Barcode and QR Code previews.
• Added support for APNG and TGA image formats.
• Added background transparency support for Barcode/QR previews.
• Added overlay image support for digital signatures with background.
• Removed insecure encryption algorithms (RC2, AES, DES, TripleDES).

Released: Mar 18, 2025

Updates in V25.3

Features

• Added the ability to sign PDFs with a custom hash signing function, enabling digital signing with an external certificate. Developers can now implement their own digital signer by assigning a custom implementation to the 'CustomSignHash' property in the signing options. This flexibility allows enforcement of specific cryptographic standards and security policies while also supporting different hash algorithms, so users can choose the algorithm that best fits their security needs.

Fixes...

Released: Jan 30, 2025

Updates in V25.1

Features

• Enhanced digital signature functionality with LTV (Long-Term Validation) support.
• Improved document loading with file type specification (Stream or File).

Released: Dec 20, 2024

Updates in V24.12

Features

• The signature verification process has been improved by integrating LINQ query support, allowing for more flexible and efficient searches within your verification processes.
• Implemented LINQ query support for the signature search method, enhancing the ability to perform complex queries and streamlining the search experience.

Fixes

• Image loading failed during search or verification in PDF files on .NET 6.

Released: Nov 20, 2024

Updates in V24.11

Fixes

• Barcode signatures remain persistent in documents after removal.

Released: Nov 1, 2024

Updates in V24.10

Features

• Adjusted the signing process to preserve existing digital signatures in the PDF document.

Fixes

• Iterative signing of digital signatures doesn't work when an image or appearance is set.
• The signing process does not maintain the original PDF document permissions.
  • Introduced two new properties in PdfSaveOptions: Permissions and PermissionsPassword.
    • The Permissions property allows users to define specific permissions such as print, copy, or edit restrictions that can be applied to the PDF...

Released: Sep 20, 2024

Updates in V24.9

Features

• Added the ability to preview documents with customizable resolution using the PreviewOptions.Resolution property.

Fixes

• Fixed: Image visibility issue in digital signatures on PDF files.

Released: Aug 25, 2024

Updates in V24.8

Fixes

• Generate previews with adjusted sizes for Excel files to correct previous sizing inaccuracies - This fix addresses an issue where previews generated from Excel files had incorrect sizes, leading to inconsistencies in how the content was displayed. With this update, the previews now match the exact height and width of the document page, ensuring that the visual representation accurately reflects the original Excel file's layout.
• Ensure signatures are correctly added to even-numbered pages...