Merge pull request #960 from dynamsoft-docs/preview

add links for the service installers and the ocr demo; update faq

Author: Ellie-dynamsoft

_articles/extended-usage/dynamsoft-service-configuration.md

@@ -41,6 +41,18 @@ Once the installation is done, the users can click the orange sentence 'click he
 
 ![Initialization](/assets/imgs/Initialization-2.png)
 
+### Download Links for the Service Installers
+
+Here is a table of links for the latest version.
+
+| Platform      | Download Link |
+| ------------- | --------------- |
+| Windows       | [Dynamic-Web-TWAIN-Service-Setup.msi](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamicWebTWAINServiceSetup.msi)       |
+| macOS         | [Dynamic-Web-TWAIN-Service-Setup.pkg](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamicWebTWAINServiceSetup.pkg)        |
+| Linux         | [Dynamic-Web-TWAIN-Service-Setup.deb](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamicWebTWAINServiceSetup.deb) <br/> [Dynamic-Web-TWAIN-Service-Setup-arm64.deb](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamicWebTWAINServiceSetup-arm64.deb) <br/> [Dynamic-Web-TWAIN-Service-Setup-mips64el.deb](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamicWebTWAINServiceSetup-mips64el.deb) <br/> [Dynamic-Web-TWAIN-Service-Setup.rpm](https://demo.dynamsoft.com/DWT/DWTResources/dist/DynamicWebTWAINServiceSetup.rpm)|
+
+You can find the download links for different versions of service installers on [unpkg](https://app.unpkg.com/dwt/files/dist/dist).
+
 ## Installation Folder
 
 The service is installed in the following folders on different platforms by default.

_articles/extended-usage/ocr.md

@@ -21,13 +21,19 @@ Read on to learn about how to use it.
 * A license with the OCR module ([30-day trial application](https://www.dynamsoft.com/customer/license/trialLicense?product=dwt))
 * [DynamicWebTWAINOCRResources.zip](https://download2.dynamsoft.com/dwt/DynamicWebTWAINOCRResources.zip)
 
+## Online Demo
+
+You can visit the [online demo](https://demo.dynamsoft.com/Samples/dwt/OCR/index.html) to try it.
+
 ## How to Use
 
 ### Step One - Install the OCR Package
 
-Download [DynamicWebTWAINOCRResources.zip](https://download2.dynamsoft.com/dwt/DynamicWebTWAINOCRResources.zip), unzip it and run `Install.cmd` inside the `DynamicWebTWAINOCRPack.zip` file as admin to install the OCR package. It will copy an `ocr` folder to the service's [installation folder](/_articles/extended-usage/dynamsoft-service-configuration.md#installation-folder). (You need to install Dynamic Web TWAIN Service beforehand.)
+Download [DynamicWebTWAINOCRResources.zip](https://download2.dynamsoft.com/dwt/DynamicWebTWAINOCRResources.zip), unzip it and run `Install.cmd` inside the `DynamicWebTWAINOCRPack.zip` file as admin to install the OCR package.
+
+It will copy an `ocr` folder to Dynamic Web TWAIN Service's [installation folder](/_articles/extended-usage/dynamsoft-service-configuration.md#installation-folder). The `ocr` folder contains the runtime and model files that are required to perform on-device OCR.
 
-The `ocr` folder contains the runtime and model files that are required to perform on-device OCR.
+PS: You need to [install Dynamic Web TWAIN Service](/_articles/extended-usage/dynamsoft-service-configuration.md#installation-of-dynamic-web-twain-service) beforehand.
 
 ### Step Two - Write a Basic Document Scanning Page
 

_articles/faq/load-pdf-files.md

@@ -7,39 +7,43 @@ keywords: Dynamic Web TWAIN, Addon, load pdf/a
 breadcrumbText: How can I load PDF/A files into the Dynamic Web TWAIN SDK?
 description: How can I load PDF/A files into the Dynamic Web TWAIN SDK?
 date: 2021-12-01 01:09:41 +0800
-last_modified: 2025-12-10 15:53:54 +0800
+last_modified: 2025-12-11 14:20:54 +0800
 ---
 
 # Addon
 
 ## How can I load PDF/A files into the Dynamic Web TWAIN SDK?
 
-Dynamic Web TWAIN can load PDF/A files, but whether the PDF Rasterizer add-on is required depends on the content of the PDF/A file:
+Dynamic Web TWAIN can load PDF/A files. Whether you need the **[PDF Rasterizer Add-on (PDFR)](https://www.dynamsoft.com/web-twain/pdf-to-image-javascript/)** depends entirely on the contents of the PDF/A document:
 
-- If the PDF/A contains text or vector graphics, it must be rasterized, and therefore requires the PDF Rasterizer add-on.
-- If the PDF/A contains only raster images, it can be loaded without the PDF Rasterizer.
+- If the PDF/A contains **text or vector graphics**, rasterization is required → **PDFR license needed**.
+- If the PDF/A contains **only raster images**, the file can be loaded **without** the PDFR add-on.
 
-You can programmatically check whether a file needs rasterization using [`IsRasterizationRequired()`](/_articles/info/api/Addon_PDF.html#israsterizationrequired):
+> [!NOTE]
+> **Looking for information about generating PDF/A files?**
+>
+> Starting from Dynamic Web TWAIN 19.3, PDF/A creation is supported.
+>
+> See: [How can I generate PDF/A files?](/_articles/faq/generate-pdf-files.md)
+
+### How to check whether rasterization is required
+
+You can programmatically detect whether a given PDF/A file requires rasterization before loading it:
 
 ```javascript
 DWTObject.Addon.PDF.IsRasterizationRequired(path); // returns true or false
 ```
 
-When enabled, the add-on automatically rasterizes PDF/A documents into images when they are loaded into the viewer.
-
-> [!NOTE]
-> **Looking for information about generating PDF/A files?**
-> Starting from Dynamic Web TWAIN 19.3, PDF/A creation is supported.
-> See: [How can I generate PDF/A files?](/_articles/faq/generate-pdf-files.md)
+If this method returns **`true`**, the SDK will need the PDFR to process the file.
 
+### When rasterization actually happens
 
-### When is PDF Rasterizer used?
+Dynamic Web TWAIN performs rasterization **only when necessary**. If [`IsRasterizationRequired()`](/_articles/info/api/Addon_PDF.md#israsterizationrequired) returns **`true`** and the PDF Rasterizer license is configured, the SDK automatically rasterizes the PDF into images using the reader settings you specify.
 
-Once the PDF Rasterizer (`PDFR`) is configured, it automatically rasterizes the file *only when needed*.
-If rasterization is required, the PDF is converted into one or more images at the specified resolution (default **200 DPI**).
+The rasterization behavior—including resolution (default **200 DPI**) and other rendering parameters—can be customized through [`SetReaderOptions()`](/_articles/info/api/Addon_PDF.md#setreaderoptions).
 
-Rasterization may occur when using any of the following APIs (including drag-and-drop):
 
+Rasterization may occur when using any of these APIs (including drag-and-drop):
 - [ `LoadImage()` ](/_articles/info/api/WebTwain_IO.md#loadimage)
 - [ `LoadImageEx()` ](/_articles/info/api/WebTwain_IO.md#loadimageex)
 - [ `LoadImageFromBase64Binary()` ](/_articles/info/api/WebTwain_IO.md#loadimagefrombase64binary)
@@ -50,9 +54,3 @@ Rasterization may occur when using any of the following APIs (including drag-and
 - [ `HTTPDownloadEx()` ](/_articles/info/api/WebTwain_IO.md#httpdownloadex)
 - [ `HTTPDownloadThroughPost()` ](/_articles/info/api/WebTwain_IO.md#httpdownloadthroughpost)
 - [ `HTTPDownloadDirectly()` ](/_articles/info/api/WebTwain_IO.md#httpdownloaddirectly)
-
-### Important Change in v19.3
-Previous versions of Dynamic Web TWAIN did **not** support exporting PDF/A files.
-As of **19.3**, you can now:
-- Load PDF/A files (with or without the PDF Rasterizer, depending on content), and
-- Generate PDF/A files.