NuGet · #1773 most downloaded on NuGet

IronPdf

2026.10.121M downloads/moNew releases in your daily digest, changelog included.

IronPDF helps C# Software Engineers to create, edit and extract PDF content in .NET projects. # C# HTML to PDF for .NET 10, .NET 9, .NET 8, .NET 7, .NET 6, .NET 5, Core, Standard, and Framework # Work with PDFs in C# using HTML, MVC, ASPX, and images # Generate, Edit, Read and Secure PDF Documents Generate PDFs with Pixel Perfect Chrome HTML to PDF Rendering: The Iron PDF library takes the frustration out of generating PDF documents by not relying on proprietary APIs. “Html-To-Pdf” renders pixel-perfect PDFs from open standard document types: HTML, JS, CSS, JPG, PNG, GIF, and SVG. In short, it uses the skills that developers already possess. Fully Supports: * .NET 10, .NET 9, .NET 8, .NET 7, .NET 6, .NET 5, Framework, Core, and Standard * Windows, MacOS, Linux, Azure, Docker and AWS For code examples, tutorials and documentation visit: https://ironpdf.com/

Last release 12 days ago
30 Sep 2026
Ships fairly regularly
a new release about every 4 weeks
Rarely documented
notes for 10 of the last 60 stable releases
46 versions withdrawn
withdrawn after publishing
127 years old
142 releases · first in 1900

Release timeline

142 releases since 1900

Releases

2026.10.130 Sept 2026
Added opt-in bitonal (1-bit CCITT Group 4) image compression through AdvancedCompressionOptions for smaller and sharper scanned PDFs
Features

Added opt-in bitonal (1-bit CCITT Group 4) image compression through AdvancedCompressionOptions for smaller and sharper scanned PDFs

Added support for digitally signing an existing named signature field using PdfSignature.SignatureFieldName

Added configurable Table of Contents titles and optional title entries through ChromePdfRenderOptions

Enhancements

Improved tagged PDF handling when merging, importing, or securing PDFs; PDF/UA structure, document language, and accessibility metadata are now preserved for copied content

Bug Fixes

Fixed an issue where RenderHtmlAsPdfUA could incorrectly mark a wrapped paragraph and following content as artifacts, causing meaningful text to be hidden from assistive technologies

Fixed an issue where converting PDFs containing emoji or other transparent content to PDF/A-1 could retain unsupported transparency and fail PDF/A-1b validation

Fixed an issue where PDF/UA output could lose the required PDF/UA identification metadata in XMP

Fixed an issue where PDF/UA conversion could cause images to disappear after a page was resized

Fixed an issue where saving merged documents as PDF/UA could produce content that strict PDF readers could not decode

Fixed an issue where signing PDFs could create duplicate AcroForm signature field names; affected signatures are now reported with a warning during verification

Fixed an issue affecting PDF processing on macOS Apple Silicon deployments

Fixed an issue where a failed PdfDocument constructor could cause an unrelated open document to be closed

Fixed intermittent crashes when PDF documents were accessed concurrently

Breaking Changes

PdfDocument now supports adding one digital signature at a time; attempting to add a second signature to the same document throws an exception. To add multiple signatures, sign and save the document, reopen it, and then add the next signature

Updates

Updated internal dependencies

2026.9.21 Sept 2026

Added multi-architecture support for the IronPdfEngine Docker image on AMD64 and ARM64

Features

Added multi-architecture support for the IronPdfEngine Docker image on AMD64 and ARM64
Added PdfDocument.SetImageAltText to set or update accessibility alternate text on images in existing PDFs, with the value preserved when converting the document to PDF/UA
Added configurable SignatureHashAlgorithm support for PDF signatures, with SHA-256 as the default, and updated the default TimestampHashAlgorithm to SHA-256; engine and Docker mode now honor these settings and caller-supplied SignatureDate Enhancements
Improved tagged PDF handling when merging, inserting, or copying pages; PDF/UA structure, structural parent keys, and accessibility metadata are now preserved for copied content without retaining structure from pages that were not copied Bug Fixes
Fixed an issue where SaveAsPdfUA() on an existing PDF could produce an invalid PDF/UA structure tree, causing PAC, and screen readers to report pages as empty
Fixed Cleaner.SanitizeWithSvg adding blank pages for landscape and mixed-orientation PDFs
Fixed false-positive ContainsJavaScript risks when scanning PDFs that do not contain JavaScript
Fixed incorrect Table of Contents page numbers when headings use author-supplied IDs
Fixed an ArgumentOutOfRangeException when page-numbered Table of Contents, HTML form generation, and form input elements were combined; improved annotation handling for unsupported types and missing optional properties
Fixed an issue where MarginLeft/MarginRight could cause an unexpected large gap between auto-sized HTML headers or footers and the page body
Fixed an issue where signing a PDF with an RFC3161 timestamp could intermittently produce a malformed or empty digital signature; signing now fails explicitly if the generated signature cannot be safely written
Fixed an issue where merging PDFs could collapse named destinations and cause internal links to point to the wrong page
Improved error messages when very large HTML documents exhaust the browser render process
Fixed an issue where merging or appending malformed PDFs with cyclic page-tree references could cause the operation to hang indefinitely
Fixed an issue where removing the Author metadata could cause it to be repopulated with the Creator value when the PDF was reopened
Fixed an issue where text drawn with standard fonts could render no-break spaces or soft hyphens as stray characters
Fixed an issue where RedactText with whole word matching could skip valid matches, particularly in merged PDFs and text with Unicode spaces or rotated text
Fixed intermittent access violations and double-free crashes when PDF documents were accessed or disposed concurrently
Fixed an issue where file inputs in rendered HTML could open an undismissible native file chooser dialog on headless hosts
Fixed an issue where reading or verifying PDFs signed with the legacy adbe.x509.rsa_sha1 format could fail Updates
Updated internal dependencies

2026.8.13 Aug 2026

Added AES-128 and AES-256 PDF encryption support through PdfSecuritySettings.EncryptionType

Features

Added AES-128 and AES-256 PDF encryption support through PdfSecuritySettings.EncryptionType
Added support for RFC 3161 trusted timestamps when signing PDFs with HSM device Bug Fixes
Fixed an issue where merging or inserting PDFs with nested bookmarks could flatten the bookmark hierarchy
Fixed startup failures on Azure App Service under read-only deployments and improved deployment error messages with clearer guidance for native engine setup
Fixed an issue where embedded file names could be ignored when converting PDFs to PDF/A
Fixed an issue where converting PDFs to PDF/UA could shift page content for documents with multiple content streams
Fixed initialization failures on minimal Linux containers and added an option to skip deployment commands
Fixed an issue where landscape rendering with responsive CSS or fit-to-page scaling could leave empty areas at the edge of the page
Fixed HSM (PKCS#11) PDF signing so signed documents validate correctly in Adobe Reader
Fixed an issue where replacing text with a standard PDF font could use the wrong font
Fixed a crash during PDF/UA conversion for certain PDFs and improved PDF/UA-1 compliance
Fixed an issue where replacing embedded subset fonts with standard fonts could produce garbled text
Fixed an issue where auto-sized HTML headers and footers could overlap page content on repeated renders
Fixed digital signature validation for PDFs with nested AcroForm signature fields or trailing padding bytes Update
Updated internal dependencies

2026.7.226 Jun 2026

Added support for extracting and accessing PDF Optional Content Groups (OCG/layers), including layer hierarchy, visibility, and object-level layer met

Features

Added support for extracting and accessing PDF Optional Content Groups (OCG/layers), including layer hierarchy, visibility, and object-level layer metadata
Added ChromePdfRenderOptions.CssPageRulePolicy and header/footer overlap detection options to improve margin handling and prevent content overlap when rendering or modifying PDFs Enhancements
Enhanced PDF scanning reliability by removing shellcode hash-based detection rules that could cause inconsistent false-positive results
Enhanced render timeout handling by detecting stalled PDF generation operations and returning clearer, more actionable error messages Bug Fixes
Fixed engine stability issues that could cause orphaned browser processes, unexpected crashes, and rendering failures under heavy load or constrained CPU environments
Fixed an issue where PDF redaction could leave partial-character artifacts or remove excess content due to inaccurate text bounding boxes
Fixed an issue where ImageToPdfConverter.ImageToPdf could generate blank PDFs for image filenames containing both spaces and multiple dots
Fixed an issue where multi-page TIFF conversion did not preserve per-page orientation and resolution for mixed-orientation PDFs
Fixed an issue where Cleaner.SanitizeWithSvg could add an extra page and corrupt non-ASCII text in sanitized PDFs
Fixed an issue where PDF signature timestamps could display an incorrect timezone offset during daylight saving time (DST) Update
Updated internal dependencies

2026.6.126 May 2026

Added AdvancedCompressionOptions for fine-grained PDF compression control, including image DPI downsampling, JPEG quality settings, structure-tree rem

Enhancements

Added AdvancedCompressionOptions for fine-grained PDF compression control, including image DPI downsampling, JPEG quality settings, structure-tree removal, and customizable optimization flags
Added PdfDocument.SetFormFont, SetFormFontFromFile, and DisableFormFontFallback APIs to control or suppress automatic form-field font embedding
Added ECDSA PDF signature support with correct SHA/OID mappings for reliable verification and signing of EC-signed PDFs Bug Fixes
Fixed invisible or missing headers and footers on scanner-generated and browser-printed PDFs
Fixed an issue where CopyPages could drop form fields with shared widget annotations across multiple pages, causing visible fields to disappear in copied documents
Fixed incorrect Table of Contents page numbers for long headings that wrapped across multiple rendered lines
Fixed excessive PDF size growth when combining static content headers/footers with dynamic content in large documents
Fixed IronPdfEngine queue deadlocks under concurrent load Updates
Updated internal dependencies

2026.5.229 Apr 2026

Added SignerCertificate and CertificateChain properties to VerifiedSignature, exposing full X.509 certificate details including Subject DN, Issuer, Se

Enhancements

Added SignerCertificate and CertificateChain properties to VerifiedSignature, exposing full X.509 certificate details including Subject DN, Issuer, Serial Number, validity period, and raw DER bytes from digitally signed PDFs
Added LinkAnnotation class for creating clickable links within PDF documents that navigate to specific pages and positions
Added LinearizePdfToBytes and LinearizePdfToStream methods, enabling fully in-memory PDF linearization without disk I/O, ideal for cloud-based and sandboxed environments
Added automatic PDF bookmark generation from HTML headings (h1–h6) during rendering, including correct hierarchy, page mapping, and optional filtering by heading level or CSS selector
Rebuilt qpdf 12.3.2 with statically linked libjpeg and zlib, removing dependency on system libjpeg.so.62 for IronPdf.Linux and ensuring compatibility with modern Linux distributions such as Rocky 9/10 and Debian 13 Bug Fixes
Fixed an issue where HTML headers and footers did not scale correctly when using UseFitToPageRendering() or UseScaledRendering() with non-default zoom levels
Fixed intermittent IronPdfInputException when rendering headers/footers with FragmentHeight on custom paper sizes
Fixed intermittent SEGFAULT during process teardown and improved tab pool stability to prevent concurrent rendering issues and log spam Updates
Updated internal dependencies

2026.5.11 Jan 1900withdrawn

Added SignerCertificate and CertificateChain properties to VerifiedSignature, exposing full X.509 certificate details including Subject DN, Issuer, Se

Enhancements

Added SignerCertificate and CertificateChain properties to VerifiedSignature, exposing full X.509 certificate details including Subject DN, Issuer, Serial Number, validity period, and raw DER bytes from digitally signed PDFs
Added LinkAnnotation class for creating clickable links within PDF documents that navigate to specific pages and positions
Added LinearizePdfToBytes and LinearizePdfToStream methods, enabling fully in-memory PDF linearization without disk I/O, ideal for cloud-based and sandboxed environments
Added automatic PDF bookmark generation from HTML headings (h1–h6) during rendering, including correct hierarchy, page mapping, and optional filtering by heading level or CSS selector
Rebuilt qpdf 12.3.2 with statically linked libjpeg and zlib, removing dependency on system libjpeg.so.62 for IronPdf.Linux and ensuring compatibility with modern Linux distributions such as Rocky 9/10 and Debian 13 Bug Fixes
Fixed an issue where HTML headers and footers did not scale correctly when using UseFitToPageRendering() or UseScaledRendering() with non-default zoom levels
Fixed intermittent IronPdfInputException when rendering headers/footers with FragmentHeight on custom paper sizes
Fixed intermittent SEGFAULT during process teardown and improved tab pool stability to prevent concurrent rendering issues and log spam Updates
Updated internal dependencies

2026.4.127 Mar 2026

Improved PDF rendering performance by reducing internal render calls and reusing browser tabs to minimize startup overhead

Enhancements

Improved PDF rendering performance by reducing internal render calls and reusing browser tabs to minimize startup overhead
Improved PDF/UA structure tree tagging for forms with mixed input types, hidden elements, deeply nested labels, and annotation ordering to ensure correct widget-to-structure element association
Reduced IronPdfEngine Docker image size by 60% (from 2.89 GB to 1.14 GB)
Improved IronPdfEngine Docker image security by removing unnecessary packages, resolving 4 high-severity CVEs and over 1,400 other security scan findings
Improved IronPdfEngine Docker container to correctly forward runtime arguments like port, license_key, and chrome_browser_limit Bug Fixes
Fixed memory leak in ReplaceTextOnPages, ReplaceUnicodeText, RedactText, and RedactRegions where repeated calls caused increasing memory growth (93-97% reduction)
Fixed buffer over-read in GetMetadata that could cause crashes or data corruption
Fixed an issue where PDF/UA conversion removed CSS overflow:hidden clipping, ensuring clipped images render identically to standard PDF output
Fixed an issue where SignatureName was always empty when verifying signatures created by external signers such as Adobe Reader
Fixed missing header/footer images in DOCX to PDF conversion (DrawingML and VML)

2026.3.126 Feb 2026

Added CompressPdfToBytes and CompressPdfToStream with automatic smart compression, reducing PDF size via disk or in-memory processing Enhancements

Features

Added CompressPdfToBytes and CompressPdfToStream with automatic smart compression, reducing PDF size via disk or in-memory processing Enhancements
Improved PDF/UA accessibility support by resolving structural tagging errors, restoring semantic tags (H1/P), fixing label rendering issues, eliminating AccessViolationException crashes during form processing, and preventing duplicate accessibility tags
Enhanced signature validation with certificate trust chain, revocation status, algorithm strength, byte range integrity, and optional incremental tampering detection checks
Enhanced RTF to PDF conversion with multi-column layout support and automatic detection of landscape orientation, margins, and column settings. Resolved table border clipping, first-character cut-off, and duplicate metafile image issues
Enhanced internal HTML rendering by replacing internal URLs with a custom scheme to improve security compliance and remove unnecessary network requests Bug Fixes
Fixed PDF/A validation failures caused by non-standard XMP metadata and incomplete Type1 font CharSet entries
Fixed an issue where parsing signature timestamps caused an unhandled exception
Fixed an issue where resizing rotated pages caused incorrect dimensions or content cutoff
Fixed LinuxAndDockerDependenciesAutoConfig to correctly install libasound2t64 on Ubuntu 24.04 for .NET 9/10 environments
Fixed an issue where HTML headers and footers rendered with incorrect width and font scaling when UseResponsiveCssRendering (Fixed Pixel Width) was enabled
Fixed System.AccessViolationException when adding top-level bookmarks to PDFs with malformed outline structures
Fixed an issue where ComboBox form fields lost selection options after merging or appending PDFs

2026.1.39 Feb 2026

Added support for Custom Hyphenation via local paths or remote URLs in ChromePdfRenderOptions Enhancements

Features

Added support for Custom Hyphenation via local paths or remote URLs in ChromePdfRenderOptions Enhancements
Enhanced UpdateImageObject with a robust state-tracking transformation system
Enhanced copying pages from existing PDF to avoid Stack Overflow exception for some specific documents Bug Fixes
Fixed issue where getting a form field with unicode characters causes IronPDF to freeze
Fixed an issue where converting certain PDFs to PDF/UA could cause text and shape colors to be reset or rendered incorrectly
Fixed an issue where flattening a PDF caused content to disappear or become clipped in documents using non-standard CropBox offsets
Fixed a compliance issue where PDF/A-4 exports failed validation due to forbidden Unicode values in ToUnicode CMaps
Fixed an issue where combobox form fields in certain PDFs displayed empty string choices and failed to validate values correctly
Fixed a System.AccessViolationException crash when processing malformed font Widths arrays in certain PDFs
Fixed a crash (Access Violation) when rendering pages with complex or malformed form fields
Fixed an issue where rectangles were drawn at the incorrect Y position
Fixed an issue where HTML headers and footers with flex-based layouts did not adapt correctly to different page orientations
Fixed an issue where HTML headers and footers rendered with incorrect height and font scaling when added post-render