Document Solutions PDF Viewer and Editor

日本語

Document Solutions PDF Viewer (DsPdfViewer) is a fast, modern JavaScript based PDF viewer and editor that runs in all major browsers. The viewer can be used as a cross platform solution to view (or modify - see Support API below) PDF documents on Windows, MAC, Linux, iOS and Android devices. DsPdfViewer is included in Document Solutions for PDF (DsPdf) - a feature-rich cross-platform PDF API library for .NET Core.

Client-side (Wasm) or server-side (DS.Documents.Pdf.ViewerSupportApi) Support API option allows you to turn DsPdfViewer into a powerful PDF editor that can be used to edit existing or create new PDFs, fill and save PDF forms, remove (redact) sensitive content, add or edit annotations and AcroForm fields, and more.

DsPdfViewer provides a rich JavaScript object model, see docs/index.html for the client API documentation.

Product highlights:

• Works in all modern browsers, including Edge, Chrome, FireFox, Opera, Safari
• Provides form filling and PDF editing tools (see Support API):
  • Customizable and mobile-friendly form filler
  • Annotation and form editors
  • Quick edits using secondary toolbars
  • PDF redaction
  • Signature verification
  • Real-time collaboration mode
  • Other editing features
• Works with frameworks such as React, Preact, Angular
• Supports form filling; filled forms can be printed or form data can be submitted to the server
• Supports XFA (XML Forms Architecture) forms
• Provides caret for text selection/copy, including vertical and RTL texts
• Includes thumbnails, text search, outline, attachments, articles, layers and structure tags panels
• Allows opening PDF files from local disks
• Supports annotations including text, free text, rich text etc.
• Supports redact annotations (including appearance streams), allows user to hide or show redacts
• Supports sound annotations
• Allows rotating and printing the rotated document
• Supports article threads navigation
• Supports file attachments
• Comes with several themes, new custom themes can be added
• Supports external CMaps
• ...and more.

See it in action

• Go to Document Solutions for PDF Viewer demos to explore the various features of DsPdfViewer, including features that rely on Support API. The demo site allows you to modify the demo code and immediately see the effect of your changes.
• The Document Solutions for PDF API demo site uses DsPdfViewer to display sample PDFs.

Latest changes

[9.1.0] - 05-May-2026

Added

• Added support for cross-domain iframe licensing. (DOC-7243)

Changed

• SignalR is now disabled by default (supportApi.webSocketUrl is false). (DOC-7328)

Fixed

• Various bug fixes and stability improvements.

[9.0.4] - 07-Apr-2026

Fixed

• Fixed an issue where setting viewer.options.snapAlignment = true in the console had no effect. (DOC-5680)
• Fixed an issue where the selected value of a radio button did not persist after saving. (DOC-7351)

[9.0.3] - 03-Mar-2026

Fixed

• Fixed an issue where rotated annotations were rendered incorrectly. (DOC-5762)
• Fixed an issue where SVG/PNG export could produce ZIP files with duplicated .zip extensions. (DOC-7227)
• Fixed runtime errors that occurred when host DOM element was removed and re-created using Angular @if / *ngIf with hideAnnotationPopups enabled. (DOC-7277)
• Fixed an issue where mouse wheel scrolling in side panels also scrolled the document in the main window. (DOC-7349)
• Fixed an issue where DsPdfViewer rendered text highlights immediately instead of skipping paint when skipPaint: true was specified. (DOC-7160)
• [iOS] Fixed an issue that caused incorrect position of custom highlights in the Custom Highlights demo. (DOC-6629)
• Fixed an issue where multi-select list box fields ignored multiple default values after a reset. (DOC-7423)

[9.0.2] - 04-Feb-2026

Fixed

• Fixed cross-Origin frame access violation when the viewer is loaded from a jscodemine hosted sample. (DOC-7339)
• [Mobile] Fixed an issue where the value of a checkbox was not updated on a Mobile Phone. (DOC-6865)
• Fixed incorrect mouse wheel behavior where it scrolled unfocused main window before scrolling focused side panel. (DOC-6955)

[9.0.1] - 23-Jan-2026

Fixed

• Fixed an issue where signatures created with the Signature tool in Wasm mode on Windows Chromium-based browsers (such as Chrome, Edge, and Brave) were saved as a "DRAFT" stamp instead of the drawn signature. (DOC-7288)
• Fixed an issue where the base URL (webSocketUrl setting) for SignalR requests could not be changed in the ASP.NET SignalR version (ASP.NET Core was not affected). (DOC-6916)

[9.0.0] - 05-Dec-2025

Added

• Added HighlightManager API, providing programmatic control over text and custom highlights. (DOC-7151)

Fixed

• Improved thumbnail image quality in the PDF Organizer dialog. (DOC-7019)
• Fixed a "Worker was terminated" console error when switching between PDF files. (DOC-7152)
• Fixed issues with stamp annotations when using certain transparent images. (DOC-7155)
• [Localization] [Regression] The "Show All" button in notifications was not localized when using the Japanese language. (DOC-7146)

See CHANGELOG.md for previous release notes.

Installation

To install the latest release version:

npm install @mescius/dspdfviewer

To install from the zip archive:

Go to https://developer.mescius.com/document-solutions/dot-net-pdf-api/download and follow the directions on that page to get your 30-day evaluation and deployment license key. The license key will allow you to develop and deploy your application to a test server. Unzip the viewer distribution files (list below) to an appropriate location accessible from the web page where the viewer will live.

Viewer zip includes the following files:

• README.md: this file
• CHANGELOG.md
• THIRD_PARTY_LICENSES.txt
• dspdfviewer.js
• dspdfviewer.worker.js
• wasmSupportApi.js
• wasmSupportApiServer.js
• DsPdf.wasm
• package.json
• index.html: example page
• docs/: documentation
• examples/: various usage examples list page
• localization/: resources for custom localization
• resources/: various resources
• themes/: theme files
• typings/: TypeScript declarations

Documentation and examples

Online documentation is available here.

For local documentation and some local usage examples, run npx serve and open link in your browser when the server is started.

Licensing

Document Solutions PDF Viewer is a commercially licensed product. Please visit this page for details.

Getting more help

Document Solutions PDF Viewer is distributed as part of Document Solutions for PDF. You can ask any questions about the viewer, or report bugs using the Document Solutions for PDF public forum.

More details on using the viewer

Adding the viewer to an HTML page:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <!-- Limit content scaling to ensure that the viewer zooms correctly on mobile devices: -->
    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" />
    <meta name="theme-color" content="#000000" />
    <title>Document Solutions PDF Viewer</title>
    <script type="text/javascript" src="lib/dspdfviewer.js"></script>
    <script>
        function loadPdfViewer(selector) {
            var viewer = new DsPdfViewer(selector,
              {
                /* Specify options here */
                renderInteractiveForms: true
              });
            // Skip the 'report list' panel:
            // viewer.addReportListPanel();
            viewer.addDefaultPanels();
            // Optionally, open a PDF (will only work if this runs from a server):
            viewer.open('HelloWorld.pdf');
            // Change default viewer toolbar:
            viewer.toolbarLayout.viewer.default = ['$navigation', '$split', 'text-selection', 'pan', '$zoom', '$fullscreen',
              'save', 'print', 'rotate', 'view-mode', 'doc-title'];
            viewer.applyToolbarLayout();
        }
    </script>
  </head>
  <body onload="loadPdfViewer('#root')">
    <div id="root"></div>
  </body>
</html>

How to license the viewer:

Set the DsPdfViewer Deployment key to the DsPdfViewer.License property before you create and initialize DsPdfViewer. This must precede the code that references the js files.

  // Add your license
  DsPdfViewer.LicenseKey = 'xxx';
  // Add your code
  const viewer = new DsPdfViewer("#viewer1", { file: 'helloworld.pdf' });
  viewer.addDefaultPanels();

Support API

Support API is our PDF processing engine that enables the PDF editing features of DsPdfViewer. Two options are available when configuring the viewer with Support API:

• Server-based Support API: requires DS.Documents.Pdf.ViewerSupportApi NuGet package which needs to run on a .NET server. The viewer connects to it via the supportApi property and uses that connection to perform any edits.

  To set up a Support API server on your system and see it in action, download any of the samples from the DsPdfViewer demo site (e.g. Edit PDF), and follow the instructions in the readme.md included in the downloaded zip.

  The full C# source code of ViewerSupportApi together with demo projects for .NET 8 and Web Forms is included in the src/ folder inside the NuGet package (the WEB_FORMS constant is defined for the Web Forms target). In your server solution you can either reference the package, or include the source project and reference it instead.

• Client-based Support API: uses the DsPdf.wasm WebAssembly binary that runs in the client browser. This configuration does not require a server connection, all editing is done on the client. You also do not need to download any additional components as the Wasm binaries are included in this package.

  To try the Wasm option, you can run the web server locally, click "More examples" and look for "Client Support API".

  Due to its client-based nature, collaboration features are not available in the Wasm configuration. Also, in this release (v7.2) the following features are not yet supported, and will be disabled in the viewer UI if the Wasm configuration is used:

  • Adding/applying redacts
  • Electronic signatures
  • Export to raster or SVG images
  • Converting annotations to content

  If you are using IIS, you will need to explicitly allow IIS to load .wasm files in your web.config in order to use DsPdf.wasm:

  <?xml version="1.0" encoding="UTF-8"?>
  <configuration>
  <system.webServer>
    <staticContent>
      <remove fileExtension=".wasm" />
      <mimeMap fileExtension=".wasm" mimeType="application/wasm" />
    </staticContent>
    <httpCompression>
      <dynamicTypes>
        <add mimeType="application/wasm" enabled="true" />
      </dynamicTypes>
    </httpCompression>
  </system.webServer>
  </configuration>

Note that you need a Document Solutions for PDF Professional license in order to use Support API in your apps.

Keyboard shortcuts

Viewer mode

• Ctrl + - zoom in
• Ctrl - - zoom out
• Ctrl 0 - zoom to 100%
• Ctrl 9 - zoom to window
• Ctrl A - select all
• R - rotate clockwise
• Shift R - rotate counterclockwise
• H - enable pan tool
• S - enable selection tool
• V - enable selection tool
• Ctrl O - open local PDF
• Ctrl F - text search
• Ctrl P - print
• Home - go to start of line
• Ctrl Home - go to start of document
• Shift Home - select to start of line
• Shift Ctrl Home - select to start of document
• End - go to end of line
• Ctrl End - go to end of document
• Shift End - select to end of line
• Shift Ctrl End - select to end of document
• Left - go left
• Shift Left - select left
• Alt Left - go back in history
• Right - go right
• Shift Right - select right
• Alt Right - go forward in history
• Up - go up
• Shift Up - select up
• Down - go down
• Shift Down - select down
• PgUp - page up
• PgDown - page down
• Shift PgUp - select page up
• Shift PgDown - select page down

Editing modes

• Delete - delete selected annotation/field
• Esc - unselect annotation/field
• Ctrl Z - undo
• Ctrl Y - redo
• Ctrl Shift Z - redo

Toolbar items

The default viewer toolbar items layout (items starting with '$' are inherited from the base viewer, other items are PDF viewer specific.):

['open', '$navigation', '$split', 'text-selection', 'pan', '$zoom', '$fullscreen', 'rotate', 'view-mode', 'theme-change', 'download', 'print', 'save', 'hide-annotations', 'doc-title', 'doc-properties', 'about']

The full list of the PDF-viewer specific toolbar items:

'text-selection', 'pan', 'open', 'save', 'download', 'print', 'rotate', 'theme-change', 'doc-title', 'view-mode', 'single-page', 'continuous-view'

The full list of base viewer toolbar items:

'$navigation' '$refresh', '$history', '$mousemode', '$zoom', '$fullscreen', '$split'

You can get default base viewer items by using the getDefaultToolbarItems() method, e.g.:

const toolbar: Toolbar = viewer.toolbar;
let buttons = toolbar.getDefaultToolbarItems();
buttons = buttons.filter(b => b !== '$refresh');

To specify a custom set of toolbar items, use the toolbarLayout property and applyToolbarLayout() method, e.g.:

viewer.toolbarLayout.viewer = {
  default: ["$navigation", 'open', '$split', 'doc-title'],
  fullscreen: ['$fullscreen', '$navigation'],
  mobile: ["$navigation", 'doc-title']
};
viewer.toolbarLayout.annotationEditor = {
  default: ['edit-select', 'save', '$split', 'edit-text'],
  fullscreen: ['$fullscreen', 'edit-select', 'save', '$split', 'edit-text'],
  mobile: ['$navigation']
};
viewer.toolbarLayout.formEditor = {
  default: ['edit-select-field', 'save', '$split', 'edit-widget-tx-field', 'edit-widget-tx-password'],
  fullscreen: ['$fullscreen', 'edit-select-field', 'save', '$split', 'edit-widget-tx-field', 'edit-widget-tx-password'],
  mobile: ['$navigation']
};
viewer.applyToolbarLayout();

Here is an example of how to create your own custom toolbar button:

const toolbar: Toolbar = viewer.toolbar;
toolbar.addItem({
  key: 'my-custom-button',
  iconCssClass: 'mdi mdi-bike',
  title: 'Custom button',
  enabled: false,
  action: () => {
    alert("Custom toolbar button clicked");
  },
  onUpdate: (args) => ({ enabled: viewer.hasDocument }),
});
viewer.toolbarLayout.viewer.default =  ['$navigation', 'my-custom-button'];
viewer.applyToolbarLayout();

Using the viewer in frameworks such as React, Preact, Angular etc.

Add a reference to the viewer script:

<body>
  <script type="text/javascript" src="/lib/dspdfviewer/dspdfviewer.js"></script>
  ...

Add the placeholder to your App template, e.g.:

<section id="pdf"></section>

Render the viewer:

let viewer = new DsPdfViewer('section#pdf');
viewer.addDefaultPanels();

DioDocs PDFビューワ

DioDocs PDFビューワは、WebアプリケーションのクライアントサイドでPDFファイルを読み込んで表示する、JavaScriptベースのPDFビューワです。また、バックエンドのAPIを使って、PDFファイルを編集することもできます。

サンプル

使い方については、下記をご参照ください。

• デモ

インストール方法

npm install @mescius/dspdfviewer

日本語版での動作保証は、日本語版サイトで公開しているバージョンのみとなります。

ドキュメント

ドキュメントについては、下記をご参照ください。

• ヘルプ
• APIリファレンス

製品情報

価格、ライセンスについては、下記をご参照ください。

• 製品情報

サポート

ナレッジベース、テクニカルサポートについては、下記をご参照ください。

• サポート＆サービス
• サブスクリプションサービス利用規約

The End.