Stay Updated with IronOCR’s Changelog

Release Notes

• Added full ICAO MRZ field extraction and best-effort VIZ Date of Issue detection to PassportInfo

• Fixed crash in SaveAsSearchablePdf when using Scale() or EnhanceResolution() during batch text rendering.

• Fixed System.Memory assembly version conflict (FileLoadException) affecting .NET Framework 4.8 customers

• Updates internal dependencies.

Release Notes

• Fix ReadPhoto and ReadScreenShot crash when no text is detected
• Fixed an issue where Unicode characters and non-standard fonts were not rendering correctly in draw text operations.
• Add Custom Font Support for Searchable PDF Generation fixing UTF-8 Character Rendering Issues

• Fix unnecessary HOCR generation and temp file cleanup issues

• Updates internal dependencies.

Release Notes

• Updates internal dependencies.

Release Notes

• Updates internal dependencies.

Release Notes

• Added SaveAsSearchablePdf() support for OcrPhotoResult and OcrDocAdvancedResult

• Fixed an issue where corrupted characters from the input Pdf appeared in the output searchable Pdf
• Fixed an issue where SaveAsSearchablePdf() throws exception when applying Deskew() to OcrInput

• Fixed an issue where SaveAsSearchablePdf() throws exception when ApplyFilter was set to true

• Updates internal dependencies.

Scale()andEnhanceResolution()filters incompatible withSaveAsSearchablePdf()- all other 10 filters work correctly. (This will log asOCR-405)

Release Notes

• Added support Ocr handwritten text in English

• Improve processing time when generating OCR searchable PDF.

• Fixed an issue where ASP.NET Web App .NET Framework (MVC/Web Forms) throws exception when using advanced scan methods.
• Fixed an issue where SaveAsSearchablePdf() throws 'Sequence contains no elements' exception

• Fixed an issue native reference files cannot be located in ASP.NET Web Forms Site (Legacy template)

• Combined IronOcr.Extensions.AdvancedScan to the main IronOcr package
• Updates internal dependencies.

Release Notes

• Updates Internal Dependencies.

Release Notes

• Updates IronSoftware.System.Drawing to 2025.9.3.

• Optimizes memory consumption for Tiff image inputs.

Release Notes

• Updates IronSoftware.System.Drawing to 2025.8.1.

• Fixes UseCustomTesseractLanguageFile cannot load file name with space.

• Fixes text flow in incorrect directions when generating searchable PDFs.

• Introduces 4 OrientationDetectionMode inDetectPageOrientation(): Fast, Balanced, Detailed, ExtremeDetailed.

• Improves DetectPageOrientation() outputs.

Release Notes

• Updates IronSoftware.System.Drawing to 2025.7.12.

• Fixes an issue where ReadPassport throwed an error of System.Index.OutOfRange for certain PDF inputs.

Release Notes

• Updates IronSoftware.System.Drawing to 2025.6.2.

• Fixes memory leak when loading PDFs that could cause applications to consume excessive memory over time.
• Fixes SaveAsSearchablePdf() ignores page indices from LoadPdfPages().

• Fixes SaveAsSearchablePdf() returns output PDFs with copies of the first page content for certain input PDFs.

• Improves searchable PDF text layer coordinates to align more with input contents.

• Improves significant latency for TIFF page Load and Read.

• Adds explanation on how Timeout works for ReadAsync method.

Release Notes

Updates:

• Updates IronSoftware.System.Drawing to version 2025.5.3.

Features:

• First release of IronOcr.Extensions.AdvancedScan for Linux and macOS.

Bug Fixes:

• Fixes issue where SaveAsSearchablePdf() ignores page indices from LoadPdfPages().

Enhancements:

• Reduces processing time when generating searchable PDFs after OCR.
• Adds options to generate searchable PDFs with or without OCR filters applied in the SaveAsSearchablePdf method.

Breaking Changes:

• Deprecates IronOcr.ComputerVision package required to run FindTextRegion and FindMultipleTextRegions APIs. Now, IronOcr.Extensions.AdvancedScan is required instead.
• Changes FrameNumber property to PageNumber in the ReadPhoto method.

Release Notes

Updates

• Updates IronSoftware.System.Drawing to version 2025.3.6.

Bug Fixes

Fixes error in SaveAsHtmlDocument() method caused by PdfDocEncoding type initializer exception related to obfuscation issue.

Release Notes

• Updates IronSoftware.System.Drawing to 2025.3.5.
• Fixes incorrect page dimensions of generated searchable PDFs from image inputs.

Release Notes

Enhancements:

Enhances the speed performance by 30% and optimized memory management by 40% for the Read and SaveAsSearchablePdf methods.

Bug Fixes:

• Fixes deployment process does not respect the installation path being set.
• Fixes issues with reading and generating multi-file types as searchable PDFs.

Release Notes

Enhancements:

• Improves reading speed when enabling RenderSearchablePdf and AutoRotateDetectionForRenderSearchablePdf.
• Improves an exception error message for an edge case issue in Read method.
• Updates dependency packages to address known security vulnerabilities.
• Disables internal log messages.

Bug Fixes:

• Fixes an issue where serializing OcrResult to JSON throws an exception.

Release Notes

• Updates IronSoftware.System.Drawing Dependency to 2024.12.3

Release Notes

• Updates IronSoftware.System.Drawing Dependency to 2024.9.15.
• Reduces the file size of searchable PDFs for majority of the use cases.
• Fixes the issue of inconsistent dimensions in searchable PDFs.
• Adds a new Tesseract configuration, AutoRotateDetectionForRenderSearchablePdf, enabling users to disable automatic rotation and manually adjust the input file's orientation.

Release Notes

• Improves ReadPassport for rotated input.
• Updates IronSoftware.System.Drawing Dependency to 2024.9.11

Release Notes

• Adds a new reading method ReadDocumentAdvanced specialized for Table data read.
• Updates IronSoftware.System.Drawing Dependency to 2024.9.10

Release Notes

• Fixes temp files do not get cleaned after finish reading
• Updates IronSoftware.System.Drawing Dependency to 2024.8.1

Release Notes

• Fixes DetecPageOrientation only returned the result of the first page content.
• Fixes ConvertToSearchablePdf overload issue.
• Reduces searchable PDF output file size from Tiff input file.
• Updates IronSoftware.System.Drawing Dependency to 2024.7.2

Release Notes

• Improved control over scanned characters: Gain more control over the characters captured during advanced scans.
• Enhanced document scanning: Advanced scan mode now supports a wider range of languages including Chinese, Traditional Chinese, Japanese, Korean, and Latin, allowing you to scan documents in more languages.
• Fixes issue where searchable PDFs returned overlapped text: This update resolves an issue where text in searchable PDFs appeared overlapped after scanning.
• Fixes issue when deploying to Azure Function: This update resolves an issue where deploying IronOCR to Azure Functions caused an error.
• Updates IronSoftware.System.Drawing Dependency to 2024.6.1

Release Notes

• Introduces new Read methods, required separate installation of the IronOcr.Extension.AdvancedScan package.
• New advanced method: ReadPhoto() [See IronOcr.Extension.AdvancedScan NuGet package].
• New advanced method: ReadScreenshot() [See IronOcr.Extension.AdvancedScan NuGet package].
• New advanced method: ReadPassport() [See IronOcr.Extension.AdvancedScan NuGet package].
• New advanced method: ReadLicensePlate() [See IronOcr.Extension.AdvancedScan NuGet package].
• Updates IronSoftware.System.Drawing Dependency to 2024.5.1

Release Notes

• Remove public log that is not related to OCR processs.
• Updates IronSoftware.System.Drawing Dependency to 2024.4.1

Release Notes

• Implement DetectPageOrientation to detect orientation of the input.
• Fixed a bug where license key would not be picked up from web.config file in .NET Framework.
• Updates IronSoftware.System.Drawing Dependency to 2024.3.4

Release Notes

• Overhauls all OcrInput methods to use Load instead of Add prefix. Please try .Load(), .LoadImage(), .LoadPdf()
• Improved overall speed by up to 90% in large PDF input contexts, using up to 80% less allocations and live objects
• Improved memory management for bitmaps in IronCV contexts
• Moved SearchablePdf to its own flag. See Configuration.RenderSearchablePdf which is on by default
• Removed hOCR outputs from default flags. Use Configuration.RenderhOCR = true to explicitly use
• Updates IronSoftware.System.Drawing Dependency to 2024.2.2

Release Notes

• Updates IronSoftware.System.Drawing to v2024.4.1
• Fix Rotation got ignored in output searchable PDF
• Fix the dimension of the output searchable PDF to be relative to the input images
• Fix issue of 16 BPP bmp exported as blank searchable PDF

Release Notes

• Updates IronSoftware.System.Drawing to v2023.12.1

Release Notes

• Saving Searchable PDF now correctly outputs original image dimensions instead of A4
• Resolved issue with pre-rotated PDF documents saving as square output Searchable PDFs
• OcrResult.Barcode's Position data now based on original image instead of relative to Crop Region
• Support for UTF-8 Encodings for OcrResult.SaveAsTextFile
• StampCropRectangle can now accept a list of rectangles to stamp
• StampCropRectangle has a static overload that returns the stamped OcrInput for further processing

Release Notes

• Updated IronSoftware.System.Drawing to version 2023.10.1.
• Updated IronSoftware.Common to version 2023.10.2.

Release Notes

• Fixes bug causing a crash when multiple Iron Software products are installed
• Added IronSoftware.Common as a new dependency
• Updated IronSoftware.System.Drawing to version 2023.9.2
• Updated IronSoftware.Native.PdfModelto version 2023.9.18570

Release Notes

• Searchable PDFs now retain bookmarks, annotations, page orientation, etc. (use OcrPdfInput)
• Searchable PDFs now require less disk space
• Added OcrPdfInput class for streamlined OCR of PDF documents
• Added OcrImageInput class for streamlined OCR of images
• Deprecated OcrInput class, although it will still be available for the foreseeable future
• Fixes stamping of crop rectangles not displaying properly

Release Notes

• Added EnableTesseractWarnings set to false by default, to suppress Tesseract warnings in the console
• Using IronSoftware.Native.PdfModel to read and write PDF
• Updates IronSoftware.System.Drawing to 2023.7.1

Release Notes

• PostBuildEvent Runtime Folder Copy Fix: Resolved an issue related to copying the runtime folder during PostBuildEvent
• Updates IronSoftware.System.Drawing to 2023.6.1

Release Notes

• Fixes an issue where license keys would not be retrieved from web.config in some .NET Framework ASP.NET projects
• Updates IronSoftware.System.Drawing to 2023.4.4

Release Notes

• Updates IronSoftware.System.Drawing to 2023.3.3
• Includes new ReadPdfAndOverlayText method on IronTesseract to add text and preserve original PDF bookmarks/annotations
• Resolves an issue causing Searchable PDFs with many images to becomes large files
• Fixes an issue where the Binarize filter made Searchable PDFs blank
• Fixes issue where the Read method would create temp files and not clean them up
• Adds support for the Iron Suite license keys
• Fixes issues with license keys stored in .config and .json files not being picked up by IronOCR
• Adds support for license keys stored in .config and .json files in subfolders of the application

Release Notes

• Adds compatibility for AWS (Amazon Linux)
• Adds compatibility for various older Linux distributions
• Improves reliability when reading text from PDFs
• Improves speed and fidelity when creating searchable PDFs
• Improves logic for finding language files
• Removes dependency on System.Drawing

Release Notes

• Adds Installation.LanguagePackDirectory for specifying path to .ocrdata files
• Fixes IronOcr for use with ClickOnce publishing and 'dotnet publish' command
• Fixes some instances where language packs would fail to load
• Fixes crop rectangle being ignored when reading from TIFF images
• Fixes trial users not being able to read text from images
• Allows single-threaded OCR reads (see IronTesseract.Multithreaded)

Release Notes

• Adds IronSoftware.System.Drawing to replace System.Drawing.Common in IronOCR
• Removes internal dependency on System.Drawing.Common (see footnote [1] for more info)
• Adds support for .NET 7
• Removes support for .NET Framework 4. Minimum supported for .NET Framework is now version 4.6.2
• Improves support for many Linux Distros
• Improves OcrFilters.DeNoise: Now reduces speckle noise.
• Adds brand new OcrFilters to improve reading from noisy images:
• Open: Filter that is useful for removing noise.
• Close: Filter that is useful for closing small holes inside foreground objects.
• AdaptiveThreshold: Applies a Bradley Adaptive Threshold to the image.

  [1] Note about removal of System.Drawing.Common:

  - Microsoft has discontinued support for System.Drawing.Common on non-Windows for .NET 6, and completely for .NET 7 : https://docs.microsoft.com/en-us/dotnet/core/compatibility/core-libraries/6.0/system-drawing-common-windows-only
• In order to handle this, we have developed an open-source library called IronSoftware.System.Drawing which easily translates between all the common types and formats that System.Drawing.Common did which will replace it
• Customers who still want to use System.Drawing.Common with IronOCR will still be able to. IronSoftware.System.Drawing will work with this format but since System.Drawing.Common is no longer a dependency, usage will require the customer to add a using System.Drawing.Common; call in their code.