--- title: "How to Implement PDF Annotations in React for Seamless Document Review" published_at: "2025-11-28T13:56:10+00:00" modified_at: "2026-07-01T11:22:19+00:00" url: "https://www.syncfusion.com/blogs/post/pdf-annotations-in-react" excerpt: "Learn how to implement PDF annotations in React. Explore adding, editing, and managing annotations in a PDF Viewer for a seamless review experience." taxonomy_category: - "PDF" - "PDF Annotation" - "PDF viewer" - "React" - "Web Development" taxonomy_post_tag: - "Document Management" - "FrontEnd Development" - "PDF Annotation" - "PDF Viewer" - "React" --- # How to Implement PDF Annotations in React for Seamless Document Review [Sumathi Uthayakumar](https://www.syncfusion.com/blogs/author/sumathi-uthayakuma) ![React PDF Annotation: How to Add, Edit, and Manage Annotations in PDF Viewer](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/React-PDF-Annotation-How-to-Add-Edit-and-Manage-Annotations-in-PDF-Viewer.jpg) **TL;DR:** Managing PDF reviews in React applications can be frustrating without built-in annotation tools, as users lack the ability to highlight, comment, or mark up documents directly in the browser. React PDF annotation solves this challenge by enabling interactive markup within a PDF Viewer, allowing developers to easily add, edit, and manage annotations through both UI and programmatic options. ## What are PDF annotations? Annotations in PDFs are user-added markups, such as highlights, underlines, strikethroughs, stamps, comments, free text, ink, and shapes, that make content clearer and easier to review. ## Why does PDF annotation matter? In real-world scenarios, reviewing PDFs without annotation tools often leads to inefficient workflows. Users typically rely on external communication channels to share feedback, which slows down decision-making and increases the risk of miscommunication. ## How does PDF annotation solve this? React PDF annotation enables users to add these markups directly inside the document, streamlining the review process and making it faster, more accurate, and highly contextual. This approach is especially useful for adding annotations online without relying on desktop tools. In this blog, we’ll show you how to implement React PDF annotation using [Syncfusion’s PDF Viewer](https://www.syncfusion.com/pdf-viewer-sdk/react-pdf-viewer) . You will learn how to add PDF annotations through both the user interface and code, and how to integrate these features into your React applications for a seamless user experience. ## Types of PDF annotations When implementing React PDF annotation, you can add various annotation types to make documents interactive and easy to review. These annotations help users provide feedback, highlight important sections, and add context directly within the document: ### 1. Text markup annotation Text markup annotations visually emphasize parts of a PDF without changing its original content. Common types include: - **Highlight**: Draw attention to key text - **Underline**: Indicate important phrases - **Strikethrough:** Mark deletions or outdated content - **Squiggly:** Flag areas needing review or correction ![Text markup annotations in PDFs using JavaScript PDF Viewer](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Text-markup-annotations-in-PDF.png) Text markup annotations in PDFs using React PDF Viewer These annotations are commonly applied during legal document reviews, academic proofreading, and technical documentation processes to highlight important sections or suggest edits. ### 2. Shape annotation The React PDF Viewer lets you add shape annotations like **Rectangle**, ** Circle**, ** Arrow**, ** Polygon,** and ** Line** to highlight specific areas in a document. These annotations are useful for marking and technical drawings, as well as for visually emphasizing sections. ![Shape annotations in PDFs](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Shape-annotations-in-PDF.png) Shape annotations in PDFs They are particularly useful in design and technical documents where visual emphasis or marking diagrams is required. ### 3. Stamp annotation Stamp annotations enable users to place predefined Dynamic, Sign Here, Standards, or custom stamps, such as **“Approved”** or **“Rejected”,** or ** logos**, on a PDF to indicate status or branding. ![Stamp annotation in PDFs](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Stamp-annotation-in-PDF.png) Stamp annotation in PDFs These annotations are commonly used in workflows to confirm approvals or indicate document status. ### 4. Sticky notes Sticky notes enable users to add small comment pop-ups to a PDF, offering feedback or extra context without cluttering the main content. ![Sticky notes in PDFs](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Sticky-notes-in-PDF.png) Sticky notes in PDFs They are ideal for document reviews where suggestions or clarifications need to be added inline. ### 5. Free text annotation Free Text annotations enable users to type text directly onto the PDF, adding visible notes or instructions without modifying the original content. ![Free text annotation in PDFs](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Free-text-annotation-in-PDF.png) Free text annotation in PDFs This is useful for adding comments, labels, or instructions in forms and review documents. ### 6. Ink annotation Ink annotations enable users to draw freehand on a PDF using a pen tool, making them perfect for sketches, notes, or signatures. ![Ink annotation in PDFs](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Ink-annotation-in-PDF.png) Ink annotation in PDFs They are commonly used to sign forms, mark diagrams, or add any freehand input. ### 7. Measurement annotation Measurement annotations enable users to measure distances, radii, volume, or areas directly on a PDF, which is particularly useful for precision-based tasks. ![Measurement annotation in PDFs](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Measurement-annotation-in-PDF.png) Measurement annotation in PDFs This is essential for precision-based tasks such as architectural plans and engineering drawings. ### 8. Handwritten signature The React PDF Viewer supports **handwritten signature annotations**, allowing users to sign documents directly in the browser. ![Handwritten signature annotations in PDFs](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Handwritten-signature-annotations-in-PDF.png) Handwritten signature annotations in PDFs This is essential for precision-based tasks such as architectural plans and engineering drawings. If you want to try these [annotations](https://help.syncfusion.com/document-processing/pdf/pdf-viewer/react/annotation/text-markup-annotation) in your application, check out the live React PDF annotation [demo](https://document.syncfusion.com/demos/pdf-viewer/react/#/tailwind3/pdfviewer/default) and explore the official [documentation](https://help.syncfusion.com/document-processing/pdf/pdf-viewer/react/overview) to learn how interactive markups work in a PDF Viewer. Now that we’ve explored the various annotation types, let’s move on to the steps for integrating the Syncfusion React PDF Viewer into your application so you can begin adding annotations to your PDFs. Create Interactive PDF Experiences in React Build powerful PDF viewing experiences in React with built-in support for annotations, highlighting, form filling, signatures, page navigation, thumbnails, bookmarks, and text search. [Build React PDF Viewer](https://www.syncfusion.com/pdf-viewer-sdk/react-pdf-viewer) ## Install Syncfusion React PDF Viewer to add PDF annotation To set up the **Syncfusion** ** PDF Viewer** in your application, follow these steps: ### Step 1: Install the Syncfusion PDF Viewer Library Begin by installing the Syncfusion PDF Viewer package using npm. This library provides all the modules required to render PDFs and enable annotation features in your React application: ``` npm install @syncfusion/ej2-react-pdfviewer --save ``` ### Step 2: Import required modules After installation, import the `PdfViewerComponent` along with other modules that support features such as **toolbar**, ** magnification**, ** navigation**, ** annotation**, ** link annotation**, ** thumbnail view**, ** bookmark view**, ** text selection**, ** text search**, ** form fields**, and ** form designer**: ``` import { PdfViewerComponent, Toolbar, Magnification, Navigation, Annotation, LinkAnnotation, ThumbnailView, BookmarkView, TextSelection, TextSearch, FormFields, FormDesigner } from '@syncfusion/ej2-react-pdfviewer'; ``` ### Step 3: Initialize the viewer Add the `PdfViewerComponent` to your React application and configure its properties. Specify the document path, set the height, and provide the service URL for backend processing. ``` ``` **Note:** For a detailed walkthrough, refer to the official [documentation](https://help.syncfusion.com/document-processing/pdf/pdf-viewer/react/getting-started) . Once the PDF Viewer is set up, you can start adding, removing, and organizing annotations using the integrated toolbar or programmatically through APIs. ## Adding PDF annotations Adding annotations becomes simple with Syncfusion’s built-in tools and APIs. ### 1. Add annotations via the UI Users can add highlights, shapes, stamps, ink, free text, sticky notes, and signatures using the toolbar. The intuitive interface allows direct interaction with annotations on PDF pages. ![Add PDF annotations in React](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Add-PDF-annotations-in-JavaScript.gif) Add PDF annotations in React ### 2. Add annotations programmatically For developers seeking flexibility and automation, the API provides a powerful way to dynamically add annotations. Instead of relying on the UI, you can use the `addAnnotation` method to create annotations programmatically: ``` pdfviewer.annotation.addAnnotation(type, options); ``` - **type**: Annotation type, such as Highlight, StickyNotes, or Line. - **options**: Defines properties like position, size, color, and page number. **Note:** For more details on adding annotations, refer to the official [documentation](https://help.syncfusion.com/document-processing/pdf/pdf-viewer/react/annotation/text-markup-annotation) . ## Deleting PDF annotations Removing annotations is as straightforward as adding them. You can delete annotations either through the user interface or programmatically using Syncfusion’s React PDF Viewer. ### 1. Delete via UI Users can quickly remove annotations by clicking the **Delete** icon in the toolbar or by right-clicking the annotation and selecting ** Delete** from the context menu. This provides an easy and intuitive way to clean up unwanted markups during review. ![Delete PDF annotations in React PDF Viewer](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Delete-PDF-annotations-in-JavaScript.gif) Delete PDF annotations in React PDF Viewer ### 2. Delete programmatically For developers who need more control, annotations can be deleted programmatically using the `deleteAnnotationById` method. Pass the annotation’s unique ID as shown below: ``` viewer.annotationModule.deleteAnnotationById(annotationId); // annotationId is a unique ID of the annotation, and it can be retrieved from the annotationCollection array. ``` The `annotationId` is a unique identifier for the annotation you want to remove. You can retrieve this ID from the `annotationCollection` array, making it simple to manage annotations dynamically. **Note:** For advanced options and detailed examples, refer to the official [documentation](https://help.syncfusion.com/document-processing/pdf/pdf-viewer/react/how-to/delete-annotation) . ## Managing PDF annotations In addition to deleting, Syncfusion’s React PDF Viewer allows users to **edit, customize, comment, export, and import annotations**, ensuring a smooth and collaborative review process. ### 1. Add comments To add comments, double-click an annotation or use the toolbar to open the **Comment Panel**. From there, you can add notes, reply to existing comments, and set statuses like **“Accepted”** or **“Rejected”** for collaborative reviews. ![Add comments to PDF annotations using React PDF Viewer](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Adding-comments-to-JavaScript-PDF-annotations.png) Add comments to PDF annotations using React PDF Viewer ### 2. Customize annotations Make annotations stand out by adjusting properties such as **stroke or fill color**, ** opacity**, ** thickness**, or ** font styles** for free text annotations. These changes can be applied through the ** Properties Panel** or programmatically via the API. ![Customize PDF annotations using React PDF Viewer](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Customizing-PDF-annotations.png) Customize PDF annotations using React PDF Viewer ### 3. Export and import React PDF annotations Syncfusion’s React PDF Viewer provides built-in support for **saving annotations** in ** XFDF** or ** JSON** formats, making it easy to persist, share, and reload annotations across sessions or applications. #### Exporting annotations (XFDF Format) To export annotations for storage or server-side processing, use the `exportAnnotations` method: ``` var xfdfData = pdfviewer.exportAnnotations(); console.log(xfdfData); // XFDF string ``` This returns all annotations in **XFDF format**, which can be saved locally or sent to a backend for further handling. ![Export and import PDF annotations using JavaScript PDF Viewer](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Exporting-and-importing-PDF-annotations.png) Export and import PDF annotations #### Importing annotations To restore previously saved annotations, use the `importAnnotations` method: ``` var savedData = localStorage.getItem('pdfAnnotations'); if (savedData) { pdfviewer.importAnnotations(savedData); } ``` This allows you to reload annotations seamlessly, ensuring a consistent review experience. ### 4. Editing PDF annotations in the browser Managing annotations is efficient and straightforward. Users can right-click any annotation to access quick actions such as **cut**, ** copy**, ** paste**, ** delete**, or ** add comments**. This streamlined approach eliminates the need for additional UI components, ensuring a faster and more intuitive review process. ![Edit annotations without extra UI](https://www.syncfusion.com/blogs/wp-content/uploads/2025/11/Annotation-editing-without-extra-UI.png) Edit annotations without extra UI **Note:** For a detailed exploration of all annotation management features, refer to the official [documentation](https://help.syncfusion.com/document-processing/pdf/pdf-viewer/react/overview) . ## Conclusion Thank you for reading! Enhance your React app with Syncfusion [PDF Viewer](https://www.syncfusion.com/react-components/react-pdf-viewer) , add highlights, notes, shapes, stamps, ink, and text in PDFs. Developers can customize styles, manage annotations efficiently, and ensure persistence by saving to PDF or exporting/importing as **JSON** or ** XFDF**, delivering a smooth, interactive document experience. Here’s what developers are saying about Syncfusion: ***“The PDF Viewer component offers all the functionality I could ask for and is fully customizable,”***[G2 Reviewer](https://www.g2.com/products/syncfusion-essential-studio/reviews/syncfusion-essential-studio-review-9106364) . Syncfusion’s PDF Viewer is also available across multiple platforms, including [Blazor](https://www.syncfusion.com/pdf-viewer-sdk/blazor-pdf-viewer) , [Angular](https://www.syncfusion.com/pdf-viewer-sdk/angular-pdf-viewer) , [ASP.NET Core](https://www.syncfusion.com/pdf-viewer-sdk/asp-net-core-pdf-viewer) **,**[ASP.NET MVC](https://www.syncfusion.com/pdf-viewer-sdk/asp-net-mvc-pdf-viewer) , [.NET MAUI](https://www.syncfusion.com/pdf-viewer-sdk/net-maui-pdf-viewer) , [JavaScript](https://www.syncfusion.com/pdf-viewer-sdk/javascript-pdf-viewer) , [Vue](https://www.syncfusion.com/pdf-viewer-sdk/vue-pdf-viewer) , [WPF](https://www.syncfusion.com/pdf-viewer-sdk/wpf-pdf-viewer) , [WinForms](https://www.syncfusion.com/pdf-viewer-sdk/winforms-pdf-viewer) , [Flutter](https://www.syncfusion.com/pdf-viewer-sdk/flutter-pdf-viewer) , and [Document SDK libraries](https://www.syncfusion.com/pdf-viewer-sdk) . Explore the live [demo](https://document.syncfusion.com/demos/pdf-viewer/react/#/tailwind3/pdfviewer/default) and check the implementation [guide](https://help.syncfusion.com/document-processing/pdf/pdf-viewer/react/annotation/text-markup-annotation) to learn how to add React PDF annotations. If you’re a Syncfusion user, you can download the setup from the [license and downloads](https://www.syncfusion.com/account/downloads) page. Otherwise, you can download a free [30-day trial](https://www.syncfusion.com/downloads/) . You can also contact us through our [support forum](https://www.syncfusion.com/forums) , [support portal](https://support.syncfusion.com/) , or [feedback portal](https://www.syncfusion.com/feedback) for queries. We are always happy to assist you! ## Related Blogs [Best React PDF Viewer Libraries in 2026: Compare Features, Tradeoffs, and Use Cases](https://www.syncfusion.com/blogs/post/best-react-pdf-viewers) [Secure Role-Based PDF Annotation in React: Filter, Lock, and Collaborate](https://www.syncfusion.com/blogs/post/role-based-pdf-annotation-in-react) [How to Implement PDF Annotations in JavaScript: Highlights, Sticky Notes, and More](https://www.syncfusion.com/blogs/post/pdf-annotations-in-javascript) [How to Import, Export, and Filter PDF Annotations in C# Using XFDF, FDF, and JSON](https://www.syncfusion.com/blogs/post/import-export-pdf-annotations-csharp)