v19.4

New Features

• Added support for writing PDF as PDF/A-3b.
• Added maxThreads param for loadFromLocalStorage() and saveToLocalStorage() to improve performance.
• Added outputInfo for startScan().

Improvements

• Improved Dynamic Web TWAIN Service to make it compatible with the previous major version’s JavaScript.
• Packaged the macOS version of Dynamic Web TWAIN Service as a universal binary.
• Removed the major version restriction using annual full licenses.
• Added mechanism to infer ResourcePath from the script path when not specified.
• Improved the triggering of OnTopImageInTheViewChanged.
• Improved the error message if the JavaScript version does not match the service version.
• Improved the REST API:
  • Added service version info for GET /server/version.
  • Added PATCH /storage/documents/{documentuid} to modify document metadata.
  • Added GET /device/scanners/jobs/{jobuid}/content to retrieve page data concurrently.
• Added an error code for failure to load password-protected PDFs.
• Updated third-party libraries to enhance security.

Bug Fixes

Fixed loading of interlaced PNGs.
Fixed an issue where the HTTP form fields are lost using segmented upload with large files.

v19.3.3

• Updated third-party libraries to enhance security.
• Fixed a COMMONJS_VARIABLE_IN_ESM warning using Vite 8+.

v19.3.2

Updated third-party libraries to enhance security.

v19.3.1

• Improved the local network access check. Screenshots have been moved to a separate web page (which lists UI differences across browsers/versions) instead of being embedded directly in the dialogs.
• Updated third-party libraries to enhance security.
• Fixed an issue with local network request parameters that caused connection failures after installation (affecting only Safari 26.2+).

v19.3

New Features

• Added a new OCR add-on, which uses latest AI technology.
• Added support for writing PDF/A files.

Other Changes

• Added checking of the local network access permission introduced in Chrome 142.
• Added extra settings for PrintEx().
• Added prevention of service installation on macOS versions lower than 10.15.
• Added support for service installation for multiple users (Windows only).
• Added an EnableLocalNetworkMixedContent property.

Improvements

• Improved the performance of RemoveAllSelectedImages() by triggering OnBufferChanged and OnBitmapChanged events only once.
• Improved performance for the viewer loading documents with thousands of pages.
• Improved image clarity for the viewer.
• Updated third-party libraries to enhance security.

Bug Fixes

• Fixed a license issue of RemoteScan.
• Fixed the auto start of the service on Linux not using GUI.
• Fixed the areaIndex of rects returned in the pageAreaSelected event.

v19.2

Highlights

• Redesigned the service configuration page (guide).
  • Moved settings of host, firewall and Bonjour service to the new external access tab.
  • Added domain binding for the service.
  • For security reasons, the settings cannot be modified through the web page unless EnableWebSetup is set to true in DSConfiguration.ini (requires admin privileges).
• Improved the performance of the webcam add-on.

Other Changes

• Added back support for Remote Scan with the following methods renamed:
  • getDynamsoftService() -> getServices()
  • setDefaultDynamsoftService() -> setDefaultService()
  • getDefaultDynamsoftService() -> getDefaultService()
• Added support for IsBlankImageAsync() on Linux/Mac.
• Added requestFocusForScanningUI parameter for RESTful API.
• Added file name and type for drag-and-dropped files in the OnPostLoad event.
• Renamed disableFocusOutline to focusOutlineEnabled.
• Improved PDF image extraction to take the transformation info (mainly mirroring) into consideration.
• Opening links in the service installation dialog will no longer open a blank window.

Bug Fixes

• Fixed the spelling of ChangeContrastAsync().
• Fixed a bug where GetSelectedImagesSize() returned 0 for images imported from PDFs. This issue occurred when loading a PDF with preserveUnmodifiedOnSave enabled and executing SelectAllImages().

v19.1

New Features

Added a new method getVisiblePagesInfo() to return the information of visible pages in a viewer. It is useful to add custom elements.

Improvements

• Added support for reading special TIFFs (e.g. 4-bit RGB interleaved, old-style JPEG compression) on Windows.
• Added support for keeping the PDF forms when saving.
• Updated the way of checking CSS file integrity from fetching to examining the effectiveness of CSS rules.
• Updated the format of license expiry date to avoid misunderstanding.

Breaking Changes

Updated the names of headers for the REST API.

• X-DICS-LICENSE-KEY -> DWT-PRODUCT-KEY
• X-DICS-DOC-PASSWORD -> DWT-DOC-PASSWORD

Bug Fixes

• Fixed a bug that when preserveUnmodifiedOnSave is set to true, CopyToDocumentAsync() will fail.
• Fixed a bug that the width and height set in percentage using the Web TWAIN object is not effective after resizing.

19.0

New Features

• Greatly expanded support for the RESTful Dynamic Web TWAIN Service.
• PDF Handling:
  • Added new PDF Rasterizer Add-On API preserveUnmodifiedOnSave to preserve the size of unmodified PDF pages when saving.
  • Added new PDF Rasterizer Add-On API IsRasterizationRequired(). This API returns true if the PDF file contains content other than one image per page. Please note that while invoking this API does not require a license for the PDF Rasterizer Add-On, a license is required to perform actual rasterization of the PDF for viewing purposes.
• Cross-platform support: Added macOS and Linux platform support for DWT Barcode Reader Add-On.
• Error messages: Added more informative error messages with the new ErrorCause API.
• Keyboard accessibility: Added Tab key keyboard navigation in the DWT Viewer. The browser now shows a focus outline on the Viewer upon tabbing into the Viewer, which can be disabled with the new {WebTwainObject}.Viewer.disableFocusOutline API. (this property is true by default, i.e. disables the outline)

Improvements

• Security enhancements: updated third-party libraries to enhance security.
• Image rasterization logic: The logic is optimized when two or all of the following properties are specified in ReaderOptions.RenderOptions: maxWidth, maxHeight, and resolution.
• Renamed the Dynamsoft Service to Dynamic Web TWAIN Service.
• New Dynamic Web TWAIN Service installation path for Windows: moved installation out of SysWOW64 and System32 on Windows to prevent rare false positive antivirus scans.
  • New 64-bit system-wide installation location: C:\Program Files (x86)\Dynamsoft\Dynamic Web TWAIN Service 19
  • New 32-bit system-wide installation location: C:\Program Files\Dynamsoft\Dynamic Web TWAIN Service 19
• Changed ErrorString messages associated with ErrorCode -2003 for HTTPUpload-related APIs to include HTTP codes in the form of HTTP process: {message}({HTTP status code}), e.g. HTTP process: OK(200). This change applies to ErrorString for the following APIs:
  • {WebTwainObject}.HTTPUpload()
  • {WebTwainObject}.HTTPUploadThroughPost()
  • {WebTwainObject}.HTTPUploadThroughPostEx()
  • {WebTwainObject}.HTTPUploadAllThroughPostAsMultiPageTIFF()
  • {WebTwainObject}.HTTPUploadAllThroughPostAsPDF()
  • {WebTwainObject}.HTTPUploadThroughPostAsMultiPagePDF()
  • {WebTwainObject}.HTTPUploadThroughPostAsMultiPageTIFF()
• Thumbnail Viewer customization: added a position property to the ThumbnailViewerEvent to facilitate further customizations, for example, displaying a delete icon when the mouse is hovering over a thumbnail.

Removed Features

• Discontinued support for the PDF Compressor Add-On.
• Discontinued out-of-the-box support for ActiveX.
• Discontinued support for 32-bit macOS: now only supporting macOS versions 10.15 and higher.
• Discontinued Android support.

Bug Fixes

• Fixed a CORS request blocked error which also triggers a prompt to install the Dynamic Web TWAIN Service.
• Fixed Vite runtime errors caused by polyfills and resource path misconfiguration.

18.5.1

Improvements

• Enhanced product security.
• Updated third-party libraries to enhance security.
• Enhanced compatibility with the HTTP Content-Security-Policy style-src directive.
• Improved scanner compatibility.
• Improved the internal algorithms of the IsBlankImageAsync API.
• Added a configuration to file-saving APIs that allows specifying whether to automatically create directories when the provided path does not exist. This option is enabled by default, and preserves existing behavior.

Bug fixes

• Fixed an issue where removing localStorage causes additional unexpected deletions under certain conditions.
• Fixed an issue where FTP upload APIs fail to respond for large file uploads.
• Fixed an issue where HTTP upload APIs do not return a response to server errors.
• Fixed a sequence issue when saving TIFF files under certain conditions.
• Reverted to the previous version of the ChangeBitDepth API algorithm when converting images to black and white.
• Fixed an issue where save-related APIs do not enter their failure callbacks upon failing to save under certain conditions.
• Fixed an issue where the file selection dialog fails to load files from manually entered file names
• Fixed an issue where right clicking on a selection of multiple images in the viewer de-selects all but one image.
• Fixed an issue where the print API prints two images on the same page under certain conditions.

18.5.0

New features

• Save the encrypted image caches in local Dynamsoft Service folder

  In certain scenarios, there may be requirements to store encrypted image caches on a local disk for temporary data storage or backup purposes. Dynamic Web TWAIN introduces a new feature that facilitates developers in securely storing image caches in encrypted form within the Dynamsoft Service folder.

• Access-Control-Allow-Origin for Dynamsoft Service

  A new security feature configures Dynamsoft Service to respond only to requests from specified origins.

• Generate the encrypted PDF files

  Supports the generation of encrypted PDF files.

New APIs

• Global

  APIs	Description
  IfCheckCORS	Whether to check CORS issue in detail.

• Buffer

  APIs	Description
  updateImage()	Update the specified image with a new image.
  OnDiskExceedLimit	A built-in callback triggered when disk cache exceeds the limit.

• Input/Output

  APIs	Description
  createLocalStorage()	Create a storage folder locally to save the cache of encrypted images.
  localStorageExist()	Determine whether the storage folder exists or not.
  saveToLocalStorage()	Save encrypted image caches to the specified storage folder.
  loadFromLocalStorage()	Load image from the specified storage folder.
  removeLocalStorage()	Remove the specified storage folder.
  httpUploadBlob()	Upload images which are in blob format.
  saveBlob()	Save image which are in blob format.
  IfSortBySelectionOrder	Whether to load the files by the selection order when load files by open file dialog.

Improvements

• Updated third-party libraries to enhance security.
• Added an optional parameter capabilities to the method getCapabilities() for getting specified capabilities.
• Added modifyId to the interface BufferChangeInfo for returning the imageId of the modified image when OnBufferChanged is triggered.
• Added password to the interface PDFWSettings for configuring the password of the PDF file to save when Write.Setup() is called.
• Added data type Device to the parameter scanner in the interface ScanSetup for supporting the device object when startScan() is used.
• Optimized the quality of the deskewed image in the built-in ImageEditor.

Changes

• Changed the design of the default Dynamsoft Service installation pop-up.

• Changed the data type of imageId from number to string. The affected APIs are as follows:

  • Methods: ImageIDToIndex(), IndexToImageID()

  • Interfaces:

    Interfaces	Related Methods or Events
    TagInfo	GetTagList()
    DocumentInfo	GetDocumentInfoList()
    OutputInfo	OnPostTransferAsync
    BufferChangeInfo	OnBufferCh...