How to Add Comments to PDF Easily in 2025

Publish date

May 4, 2025

AI summary

Explore eight tools for adding comments to PDFs, including Adobe Acrobat DC, PDF Expert, and Foxit PDF Editor, each offering unique features for efficient annotation and collaboration across various platforms.

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Commenting on PDFs Made Easy

Need to add comments to PDF documents? This listicle presents eight tools to streamline your workflow, whether you're marking up legal documents, providing feedback on marketing materials, or collaborating on a research paper. Learn about top-rated PDF editors and viewers like Adobe Acrobat, PDF Expert, and Foxit, along with free options and Mac-specific solutions. Quickly find the best way to add comments to PDF files and improve your document review process. We'll also briefly touch on AI-powered PDF interaction.

1. Adobe Acrobat DC

When it comes to adding comments to a PDF, Adobe Acrobat DC often sits at the top of the list. As the industry-standard PDF editor, Acrobat DC provides a robust suite of tools that goes far beyond simple commenting, enabling you to create, edit, sign, and manage PDF documents with ease. Whether you need to add sticky notes for quick feedback, highlight important sections, strikethrough outdated text, or insert detailed text comments, Acrobat DC has you covered. Its commenting features are especially valuable for collaborative work, allowing teams to track and respond to each other's annotations efficiently. This makes it a powerful tool for students working on group projects, knowledge workers sharing feedback on reports, and professionals in fields like finance, legal, and marketing who require precise and trackable communication on documents. From simple markups on a student's essay to complex legal reviews, Acrobat's diverse toolset makes it suitable for a wide array of applications.

Adobe Acrobat DC offers a comprehensive set of commenting tools including sticky notes, highlighting, underlining, strikethroughs, freehand drawing tools, and text boxes, enabling precise feedback and in-depth discussions directly within the PDF. The comment tracking and management system ensures that all feedback is organized and easily accessible. You can view a summary of all comments, reply to specific annotations, and even mark comments as resolved. This streamlined workflow facilitates efficient collaboration and keeps everyone on the same page. Furthermore, integration with Adobe Document Cloud allows for seamless sharing and collaboration, making it easy to distribute PDFs for review and consolidate feedback. Learn more about Adobe Acrobat DC for a deeper dive into its annotation capabilities.

For professionals dealing with sensitive information, Acrobat DC's advanced security features provide peace of mind. Features such as password protection, redaction tools, and digital signatures ensure that your documents remain confidential and tamper-proof. Acrobat DC is available on desktop (Windows and macOS), web, and mobile (iOS and Android) platforms, providing flexibility to add comments to PDF files from virtually anywhere. While the software boasts a wide range of features, implementing basic comments is straightforward. Simply open your PDF in Acrobat, select the "Comment" tool, and choose your preferred annotation method.

Pros:

Comprehensive and professional-grade tools for all commenting needs.

Seamless integration with other Adobe products.

Advanced security features for protecting sensitive information.

Availability across desktop, web, and mobile platforms.

Robust comment tracking and management system.

Cons:

Requires a paid subscription, which can be expensive for individual users or small businesses.

The extensive feature set can be overwhelming for users with basic commenting needs.

Can be resource-intensive and may run slowly on older hardware.

New users may face a steep learning curve to master all the features.

Pricing: Adobe Acrobat DC offers various subscription plans. Check the website for current pricing details.

Technical Requirements: System requirements vary depending on the platform (Windows, macOS, iOS, Android). Refer to the Adobe website for specific details.

2. PDF Expert

PDF Expert is a powerful and intuitive PDF editor designed for Apple devices, making it a top choice for anyone needing to add comments to PDF documents. Whether you're a student annotating research papers, a knowledge worker collaborating on project proposals, or a professional in finance, legal, or marketing reviewing contracts and reports, PDF Expert streamlines the process. This software allows you to easily add notes, highlight text, draw shapes, and even insert stamps for a comprehensive review and markup experience. Its clean, user-friendly interface makes navigating and utilizing these features a breeze, even for those unfamiliar with PDF editing software.

PDF Expert distinguishes itself through its speed and ease of use. Unlike some more cumbersome PDF editors, PDF Expert boasts fast performance and quick loading times, allowing you to jump into your documents and add comments to PDF files without delay. This is particularly beneficial for those working with large or complex files. For iPad users, the excellent Apple Pencil support elevates the annotation experience, making handwritten notes and drawings feel natural and precise. Adding comments to PDF documents becomes as seamless as writing on paper.

Features like customizable text and handwritten annotations, highlighting, underlining, strikethrough tools, shape tools, stamps, and signatures provide a versatile toolkit for expressing your thoughts and feedback directly within the PDF. The ability to sync your work across multiple Apple devices through cloud integration ensures you can access and continue your work wherever you are.

While PDF Expert shines in its user experience and performance on Apple devices, it is important to note its limitations. The software is exclusive to the Apple ecosystem, meaning Windows and Android users are out of luck. Additionally, some advanced features, like OCR and redaction, require a subscription. While more affordable than Adobe Acrobat, PDF Expert also offers fewer collaboration features and is less comprehensive for handling very complex PDF tasks.

Pricing: PDF Expert offers different pricing tiers for Mac, iPad, and iPhone, with options for one-time purchases and subscriptions. Check their website for the latest pricing details.

Technical Requirements: macOS, iOS, iPadOS. Specific version requirements are available on the PDF Expert website.

Implementation Tip: To get the most out of PDF Expert, familiarize yourself with the various annotation tools available. Experiment with different colors, styles, and shapes to create a visually clear and organized system for adding comments to PDF documents.

Why PDF Expert deserves its place on this list: PDF Expert earns its spot due to its intuitive interface, speed, and comprehensive annotation features tailored for the Apple ecosystem. It strikes an excellent balance between ease of use and functionality, making it a great choice for students, professionals, and anyone looking to efficiently add comments to PDF files on their Mac, iPad, or iPhone.

Website: https://pdfexpert.com/

3. Foxit PDF Editor

Foxit PDF Editor (formerly PhantomPDF) is a robust and versatile software solution that makes adding comments to PDF files efficient and straightforward. Whether you're a student marking up research papers, a knowledge worker collaborating on project documents, or a professional in finance, legal, or marketing reviewing contracts or presentations, Foxit offers a comprehensive toolkit to enhance your PDF workflow. Need to add comments to a PDF? Foxit PDF Editor makes it easy to insert text notes, highlight important sections, call out specific details with annotations, and even draw shapes directly onto the document. This makes it an excellent choice for collaborative reviews, allowing teams to share feedback and make revisions efficiently.

Foxit PDF Editor stands out for its rich feature set, comparable to Adobe Acrobat, but at a significantly more affordable price point. Its complete annotation toolkit includes options for text notes, callouts, typewriter comments, drawing tools for freehand markups and shapes, customizable stamps, and various commenting styles. You can even tailor the appearance of your comments to maintain consistency across documents. The built-in comment management panel simplifies tracking feedback and responding to colleagues, streamlining collaborative workflows. Furthermore, shared review capabilities are specifically designed for team collaboration, enabling multiple users to add comments to the same PDF simultaneously. This is particularly valuable for legal professionals reviewing contracts or marketing teams finalizing campaign materials. Learn more about Foxit PDF Editor as a useful tool for highlighting in PDFs. This skill can be particularly helpful when you want to add comments to a PDF for review and feedback.

Pros:

Affordability: Provides similar functionality to Adobe Acrobat at a lower cost.

Cross-Platform Compatibility: Available for both Windows and Mac operating systems.

Performance: Offers fast performance and has lower system requirements compared to some competitors.

Security: Includes strong security features such as redaction for sensitive information.

Cons:

Interface: Some users find the interface less intuitive than other PDF editors.

Stability: Occasional stability issues have been reported by some users.

Cloud Integration: Cloud integration isn't as seamless as Adobe's offerings.

Mobile App Limitations: The mobile app versions offer limited functionality compared to the desktop software.

While pricing details can vary depending on licensing options and specific needs, Foxit PDF Editor generally presents a more budget-friendly alternative to high-end PDF editing software. Implementing Foxit is straightforward – download the software from the official website, install it, and you're ready to start adding comments to your PDF documents. For those who need to frequently add comments to PDF files, Foxit PDF Editor offers a compelling balance of features, performance, and affordability. Visit the Foxit website for more information and to explore the different licensing options.

4. Xodo PDF Reader & Editor

Xodo PDF Reader & Editor stands out as a powerful, completely free solution for adding comments to PDF files. Whether you're a student marking up research papers, a knowledge worker collaborating on project documents, or a professional in finance, legal, or marketing reviewing contracts and reports, Xodo offers the essential tools you need. It empowers users to efficiently add comments to PDFs with a comprehensive suite of annotation features, all without requiring a subscription. From highlighting key passages and adding sticky notes to freehand drawings and form filling, Xodo simplifies the process of interacting with digital documents. Its strength lies in its balance of functionality and accessibility, making it an ideal choice for anyone looking to add comments to PDFs without breaking the bank.

One of Xodo's key advantages is its cross-platform compatibility. Available for Android, iOS, Windows, and web browsers, it allows seamless synchronization of your annotated PDFs across all your devices. This is particularly useful for professionals who frequently switch between their desktop, laptop, tablet, and smartphone. Imagine adding comments to a legal document on your office computer and then continuing your review on your iPad during your commute – Xodo makes this workflow a reality. Furthermore, its offline capability ensures that you can continue working on your PDFs even without an internet connection, a valuable feature for those working on the go or in areas with limited connectivity.

For collaborative projects, Xodo facilitates real-time collaboration with multiple users. This feature allows teams to review and annotate documents simultaneously, streamlining workflows and enhancing communication. For instance, marketing teams can use Xodo to collectively review and provide feedback on campaign proposals. Learn more about Xodo PDF Reader & Editor for specific instructions on utilizing its features. While Xodo excels in its free offerings, it’s worth noting that it has fewer advanced features compared to paid PDF editing software. Features like advanced form creation and extensive customer support are limited. Occasionally, users have reported syncing issues with cloud services, so it's recommended to save local copies of important documents.

Key Features and Benefits:

Free Annotation Tools: Includes highlights, sticky notes, freehand drawing, and form filling capabilities.

Real-time Collaboration: Enables multiple users to work on the same PDF simultaneously.

Cross-Platform Availability: Accessible on Android, iOS, Windows, and web browsers.

Offline Mode: Allows working with PDFs even without an internet connection.

Customizable Reading Experience: Offers features like night mode for comfortable reading.

Pros:

Completely free for all platforms.

Clean and intuitive user interface.

Good performance, even with large PDF files.

No account required for basic functionality.

Cons:

Fewer advanced features compared to paid alternatives.

Limited customer support.

No advanced form creation tools.

Occasional syncing issues with cloud services.

Website: https://www.xodo.com/

Xodo's free access to a comprehensive set of annotation tools and its cross-platform synchronization capabilities make it a compelling choice for anyone looking to add comments to PDFs efficiently. While it lacks some advanced features found in paid solutions, its intuitive interface and robust performance make it an excellent free option for a variety of users, from students to seasoned professionals.

5. PDFelement

PDFelement by Wondershare is a robust yet accessible solution for adding comments to PDF documents. It offers a compelling alternative to Adobe Acrobat, particularly for those seeking a balance of comprehensive features and affordability. Whether you're a student marking up research papers, a knowledge worker collaborating on project proposals, or a professional in finance, legal, or marketing reviewing contracts, PDFelement provides the tools you need to efficiently add comments to PDFs. You can easily add comments to PDF files for tasks ranging from simple note-taking to in-depth document review.

PDFelement shines with its intuitive interface, making it simple to add comments to PDF documents. Its comprehensive annotation toolkit includes sticky notes for adding detailed comments, highlighting for emphasizing key passages, underlines for drawing attention to specific text, and various drawing tools for freehand annotations. The ability to customize colors and styles for these annotations allows for clear visual organization and differentiation of feedback. Beyond basic commenting, PDFelement offers a comment management system with sorting and filtering options, allowing you to navigate and address feedback effectively. A markup summary feature provides a convenient overview of all comments within the document, simplifying the review process.

For those working with scanned documents, PDFelement's OCR (Optical Character Recognition) technology (available in the Pro version) converts scanned text into editable and searchable content, enabling you to add comments directly to scanned PDFs. Furthermore, cloud storage integration facilitates seamless sharing of annotated PDFs, enhancing collaboration among team members.

Pricing and Technical Requirements: PDFelement offers several licensing options, including a free trial, a perpetual license for a one-time purchase, and a subscription-based model. The specific features available (such as OCR) and the number of devices allowed depend on the chosen plan. It is compatible with Windows, macOS, iOS, and Android, providing flexibility across various platforms. Check their website for the latest pricing and system requirements.

Comparison with Similar Tools: While PDFelement offers a robust suite of features at a more competitive price than Adobe Acrobat, Acrobat remains the industry standard for advanced features and enterprise-level collaboration. For users with less demanding needs, PDFelement provides an excellent balance of functionality and affordability. Compared to other PDF editors like Foxit PhantomPDF or Nitro Pro, PDFelement often presents a more user-friendly experience, particularly for beginners.

Implementation/Setup Tips: Downloading and installing PDFelement is straightforward. To add comments, simply open your PDF document, select the desired annotation tool from the toolbar, and click or drag within the document to apply the comment. The intuitive interface makes it easy to customize colors, styles, and other properties. Explore the comment management and markup summary features to streamline your review workflow.

Pros:

User-friendly interface with intuitive controls

More affordable than Adobe Acrobat

Available for Windows, Mac, iOS, and Android

Good balance of features and simplicity

Cons:

Not as feature-rich as Adobe Acrobat for enterprise needs

OCR functionality requires the Pro version

Some users report occasional performance issues with very large files

Cloud collaboration not as robust as some competitors

Website: https://pdf.wondershare.com/

PDFelement deserves its place on this list for its accessible approach to adding comments to PDF files. It combines a user-friendly interface with a comprehensive set of annotation tools, making it a valuable tool for anyone who regularly works with PDFs, regardless of their technical expertise.

6. Preview (Mac)

For Mac users seeking a straightforward way to add comments to PDF files, the native Preview app offers a surprisingly robust solution. Forget downloading extra software – Preview comes pre-installed on all macOS computers and provides a completely free way to annotate your documents. This makes it an ideal choice for students, knowledge workers, and professionals in various fields, including finance, legal, and marketing, who need to quickly add comments to PDFs without investing in specialized software. Whether you're marking up a contract, adding feedback to a marketing proposal, or simply highlighting important passages in a research paper, Preview makes it easy.

Preview offers a range of essential markup tools. You can add text comments directly within the PDF, highlight key phrases, and use drawing tools to create shapes and visual annotations. It even supports digital signatures for those needing to sign documents electronically. Navigating lengthy documents is facilitated by the thumbnail view, allowing you to quickly jump between pages. Plus, Preview's tight integration with macOS sharing features enables seamless collaboration by allowing you to easily share your annotated PDFs. For example, you could easily markup a PDF contract, add your digital signature, and quickly share it via email, all within Preview.

While Preview may not offer the advanced collaboration features found in dedicated PDF editors, its simplicity and zero cost make it a powerful tool for handling basic PDF commenting needs on a Mac. Its intuitive interface makes it easy to learn, even for those unfamiliar with PDF annotation tools. This is particularly valuable for students who need a quick and easy way to add comments to their study materials. Furthermore, its speed and lightweight nature ensure it doesn't bog down your system resources.

Features:

Built-in markup tools including text notes and highlighting

Drawing and shape tools for visual annotations

Digital signature support

Thumbnail view for navigating multi-page documents

Integration with macOS sharing features

Pros:

Free and pre-installed on all Mac computers

Fast and lightweight

Simple, intuitive interface

Seamless integration with macOS

Cons:

Only available on Mac

Limited collaboration features (compared to dedicated PDF editors)

Fewer annotation options compared to dedicated PDF tools

No cloud-based collaboration tools

Website: https://support.apple.com/guide/preview/welcome/mac

Preview earns its spot on this list by providing a readily accessible, cost-effective, and user-friendly solution for adding comments to PDFs on Mac. While more advanced users might require the robust features of a dedicated PDF editor, Preview effectively caters to the majority of users who need a quick, simple, and free method to annotate their PDF documents.

7. Nitro PDF Pro

Nitro PDF Pro earns its spot on this list as a robust and feature-rich option for anyone needing to add comments to PDF files. It's a strong contender for users seeking a more affordable alternative to Adobe Acrobat, particularly those working in Windows environments, while still offering the advanced commenting features crucial for collaborative work and in-depth document review. Whether you're a student marking up research papers, a knowledge worker collaborating on project proposals, or a professional in finance, legal, or marketing reviewing contracts and reports, Nitro PDF Pro offers the tools you need.

This software goes beyond simply adding comments to PDFs; it provides a comprehensive suite of annotation tools. You can add sticky notes for quick remarks, use text callouts to explain specific sections, highlight important passages, and even use drawing tools for visual annotations. These tools, combined with customizable styles, empower users to create clear and visually distinct comments, crucial for efficient communication and feedback.

Key Features for Adding Comments to PDF:

Complete Annotation Toolkit: Nitro boasts a full range of markup tools including sticky notes, text boxes, callouts, highlighting, freehand drawing, and stamps. The ability to customize styles for each annotation type ensures clear visual organization. This is particularly useful in collaborative settings or when dealing with complex documents.

Comment Panel: Manage all your annotations efficiently within a dedicated comment panel. Reply to existing comments, track changes, and resolve feedback all within a centralized location. This feature simplifies the review process, especially for lengthy documents or projects with multiple collaborators.

Collaboration through Nitro Cloud: Take collaboration to the next level with Nitro Cloud. This feature facilitates seamless sharing and co-authoring, enabling teams to work together on PDF documents regardless of location. Streamlined workflows for approvals and feedback make this a valuable tool for businesses.

eSignature Integration: Nitro integrates eSignature capabilities directly within the commenting workflow. This is incredibly useful for legal, finance, and other professionals who need to sign and approve documents after review.

Batch Processing: For those needing to add comments to multiple PDFs, Nitro PDF Pro offers batch processing. This powerful feature saves significant time and effort when dealing with large volumes of documents.

Pros:

Cost-Effective: Nitro offers similar functionality to Adobe Acrobat at a more affordable price point, making it a budget-friendly option for individuals and businesses alike.

Familiar Interface: The Microsoft Office-like interface makes it easy to pick up and use, minimizing the learning curve for new users.

Robust Enterprise Features: Deployment tools and advanced security features make it a viable option for large organizations.

Handles Large Documents Well: Nitro performs admirably even with large, complex PDFs, a crucial factor for professionals working with resource-intensive documents.

Cons:

Limited Mac Support: While there is a Mac version, it is not as fully featured as the Windows version. This might be a significant drawback for Mac users.

Mobile App Limitations: The mobile apps, while functional, are not as robust as the desktop version, limiting on-the-go functionality.

Cloud Subscription Required for Collaboration: Taking advantage of Nitro Cloud's collaborative features requires a subscription, adding to the overall cost.

Steeper Learning Curve (for some): Some users find the software slightly more challenging to learn compared to simpler alternatives, although its comprehensive features justify the extra effort.

Pricing: Nitro PDF Pro offers various licensing options, including individual and business plans. Check their website for the latest pricing and available discounts.

Technical Requirements: Specific technical requirements vary depending on the operating system. Visit the Nitro website for detailed system requirements.

Implementation Tip: When collaborating, establish a clear commenting convention within your team. Utilize different annotation types and colors to differentiate feedback and streamline the review process.

Website: https://www.gonitro.com/product/nitro-pdf-pro

In conclusion, Nitro PDF Pro is an excellent choice for those seeking a powerful and versatile tool to add comments to PDFs. Its extensive feature set, combined with its relatively affordable price point, makes it a compelling alternative to more expensive options. While it has a few drawbacks, its strengths in annotation, collaboration, and overall performance make it a worthy addition to this list for anyone serious about PDF productivity.

8. Smallpdf

Smallpdf is a browser-based platform offering a streamlined approach to add comments to PDF documents. It's ideal for those who need to quickly annotate PDFs without the hassle of installing dedicated software. Its core features include highlighting text, freehand drawing, and adding text comments directly onto the PDF. This makes it suitable for various use cases, from simple note-taking on research papers to collaborative reviews of marketing materials. Because Smallpdf requires no installation and works on any device with a web browser, it's a practical solution for students working across multiple devices, knowledge workers collaborating on projects, or professionals in finance, legal, and marketing who frequently handle PDF documents.

Smallpdf shines with its simplicity and accessibility. Its intuitive interface makes it easy to upload a PDF and begin adding comments within seconds. While it offers a free tier for basic use, which is perfect for occasional annotation needs, paid subscriptions unlock additional features and remove limitations on file size and usage. This freemium model makes it accessible to users with varying needs and budgets. For example, a student might use the free tier for adding comments to study materials, while a marketing professional could opt for a paid subscription to enable more extensive collaboration and access to advanced PDF tools. Smallpdf's integration with popular cloud storage services like Google Drive and Dropbox further simplifies the workflow, allowing for seamless file access and sharing.

Compared to dedicated desktop PDF editors, Smallpdf's annotation features are more basic. You won't find advanced features like stamps, sticky notes, or form filling. However, for straightforward commenting needs, Smallpdf offers a good balance between functionality and ease of use. Learn more about Smallpdf and how it stacks up against other PDF software options.

Pros:

Works on any device with a web browser

Simple, intuitive interface

Free tier available for basic needs

No installation required

Cloud storage integration

Cons:

Limited annotation capabilities compared to desktop applications

Requires internet connection

File size limitations on free plan

Privacy concerns with uploading documents to a web service

Implementation Tips:

For collaborative reviews: Upload your PDF to Smallpdf and use the sharing options to invite colleagues. Everyone can then add their comments directly onto the document.

For studying: Highlight key sections of your reading material and add text comments to summarize important concepts.

For quick feedback: Use the drawing tools to mark up design mockups or other visual documents.

Smallpdf earns its place on this list because of its accessibility and ease of use, making it an ideal choice for quick and simple PDF commenting tasks. Its browser-based nature removes the need for software installation, catering to users who value convenience and cross-device functionality. While it might not replace feature-rich desktop applications for advanced PDF editing, it's a powerful tool for adding basic comments to PDF documents. Visit the Smallpdf website to explore its capabilities and determine if it meets your PDF annotation requirements.

Commenting Features Comparison of 8 PDF Tools

Product	Core Features & Tools	User Experience ★★★★☆	Value & Pricing 💰	Target Audience 👥	Unique Selling Points ✨
Adobe Acrobat DC	Comprehensive annotation, comment tracking	Professional-grade, steep learning curve	💰💰💰 High subscription cost	Enterprises, professionals	🏆 Integration with Adobe Cloud, advanced security
PDF Expert	Annotations with Apple Pencil, stamps, syncing	Intuitive, fast, Apple ecosystem only	💰💰 Moderate, subscription based	Apple users, creative pros	✨ Best Apple Pencil support, clean UI
Foxit PDF Editor	Complete toolkit, shared reviews, stamps	Fast, less polished UI	💰💰 More affordable than Adobe	SMBs, cross-platform users	✨ Strong security, lower system requirements
Xodo PDF Reader	Free annotations, real-time collaboration	Clean, intuitive, cross-platform	💰 Free	General users, students	🏆 Free, no account needed, offline mode
PDFelement	OCR, markup summary, cloud integration	User-friendly, balanced features	💰💰 Affordable alternative	Beginners, professionals	✨ OCR support, simple interface
Preview (Mac)	Basic markup tools, digital signatures	Fast, lightweight, macOS native	💰 Free	Mac users	🏆 Built-in, no installation
Nitro PDF Pro	Annotation, collaboration, batch comments	Familiar MS Office-like UI	💰💰 Cheaper than Adobe	Enterprise, Windows users	✨ Nitro Cloud collaboration, eSignatures
Smallpdf	Browser-based, basic annotation	Simple, no install, web access	💰 Free tier, paid plans	Occasional users, multi-device	✨ Web-based, integrates cloud storage

Choosing the Right PDF Commenting Tool

Adding comments to PDFs is essential for efficient collaboration and effective communication across various fields, from education and marketing to legal and finance. As we've explored, numerous tools cater to this need, ranging from free basic viewers like Preview and Xodo to powerful, feature-rich software like Adobe Acrobat DC, Nitro PDF Pro, and Foxit PDF Editor. Mid-range options like PDF Expert and PDFelement provide a strong balance between functionality and cost-effectiveness, offering robust commenting features without the premium price tag.

The key takeaway is to select a tool that aligns with your individual requirements. Consider factors like your budget, the frequency with which you work with PDFs, and the complexity of the annotations you need to add. Are you simply adding basic notes and highlights, or do you require advanced features like drawing tools, stamps, and collaborative review functionality? The tools covered in this article offer a range of options to suit every workflow.

For those seeking to take their PDF interaction to the next level, explore the potential of AI-powered tools. Want to add comments to PDFs more efficiently and intelligently? Check out PDF.ai (PDF AI) for an AI-powered experience that goes beyond basic commenting to provide deeper understanding and interaction with your PDF content.