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PDFAnnotations VS Sumnotes

Compare PDFAnnotations VS Sumnotes and see what are their differences

DocRaptor
As the only API powered by the Prince HTML-to-PDF engine, DocRaptor provides the best support for complex PDFs with powerful support for headers, page breaks, page numbers, flexbox, watermarks, accessible PDFs, and much more featured
Contents:
  1. ยป Base Details
  2. ยป Videos
  3. ยป Reviews
  4. ยป Alternatives

PDFAnnotations logo PDFAnnotations

A local-first web tool to extract PDF highlights, notes, and comments directly into Obsidian, Notion, Markdown, CSV, and JSON. 100% offline and private.

Sumnotes logo Sumnotes

Export highlights from PDFs
  • PDFAnnotations export
    export //
    2026-05-28
  • PDFAnnotations upload
    upload //
    2026-05-28
  • PDFAnnotations tool
    tool //
    2026-05-28
  • PDFAnnotations how it works
    how it works //
    2026-05-28

What is PDFAnnotations?

PDFAnnotations.com is a privacy-first, and browser-local web utility designed to extract highlights, comments, notes, and drawings from PDF files. It formats and exports this extracted data directly into structured notes for personal knowledge management (PKM) tools like Obsidian and Notion, as well as standard formats like Markdown, CSV, JSON, and plain text.

Unlike cloud-based extraction services, PDFAnnotations operates entirely on the client side. This means your PDF documents never leave your computer, allowing you to use the tool completely offline with absolute data privacy.

Key Features:

  • 100% Local First: No registration, no uploads, and no server-side processing required. Your files remain on your local machine.
  • Smart "Sentence" Mode: Automatically expands highlighted keywords or phrases into the complete sentence they belong to, preserving the original context of your reading.
  • Interactive Template Designer: Fully customize how your annotations are formatted. Easily design color-coded native Obsidian Callouts or structured data formats using dynamic variables ({{content}}, {{page}}, {{author}}, {{colorHex}}, etc.).
  • Preserves Threaded Reply Chains: Extracts and maintains the nested structure of comment replies (e.g., co-author reviews) along with page numbers, author names, and precise RGB colors.
  • Advanced Filtering: Interactively filter your annotations by highlight color, specific reviewer/author, page range, or annotation type (underlines, strikeouts, squiggly lines) before exporting.
  • 6 Export Options: Seamlessly export your compiled annotations to Obsidian, Notion, Markdown (.md), CSV, JSON, or Plain Text (.txt).
  • Sumnotes Landing page
    Landing page //
    2022-03-11

PDFAnnotations features and specs

  • Local First
    No registration, no uploads
  • Template Designer
    Fully customize how your annotations are formatted. Easily design color-coded native **Obsidian Callouts** or structured data formats using dynamic variables (`{{content}}`, `{{page}}`, `{{author}}`, `{{colorHex}}`, etc.).
  • Preserves Threaded Reply Chains
    Extracts and maintains the nested structure of comment replies (e.g., co-author reviews) along with page numbers, author names, and precise RGB colors
  • Advanced Filtering
    Interactively filter your annotations by highlight color, specific reviewer/author, page range, or annotation type (underlines, strikeouts, squiggly lines) before exporting
  • Multiple Export Options
    Seamlessly export your compiled annotations to Obsidian, Notion, Markdown (.md), CSV, JSON, or Plain Text (.txt)
  • Multi-Language Support
    11 UI languages support

Sumnotes features and specs

  • Ease of Use
    Sumnotes offers a straightforward and user-friendly interface that allows users to easily upload PDF files and extract highlights without a steep learning curve.
  • Highlight Extraction
    The primary feature of Sumnotes is its ability to accurately extract highlighted text from PDF files, saving users time compared to manual extraction.
  • Export Options
    Sumnotes provides flexible export options, allowing users to save their extracted notes in various formats such as Word, Excel, or plain text, which can be convenient for different use cases.
  • Cloud Integration
    The service integrates with major cloud storage platforms like Google Drive and Dropbox, making it easy to access and manage documents from multiple devices.
  • No Software Installation
    As a web-based tool, Sumnotes does not require any software installation, enabling users to access its features quickly through a web browser.

Possible disadvantages of Sumnotes

  • Limited Free Version
    The free version of Sumnotes has limitations on the number of pages or documents that can be processed, pushing users towards a paid subscription for larger tasks.
  • Dependence on Internet
    Being a web-based application means that Sumnotes requires a stable internet connection, which can be a limitation in areas with unreliable internet access.
  • Privacy Concerns
    Uploading documents to a third-party service may raise privacy concerns for users who deal with sensitive or confidential information.
  • Feature Set
    While effective at extracting highlights, Sumnotes may lack advanced features and customization options that are available in more comprehensive PDF management tools.
  • Processing Speed
    The processing speed for extracting highlights may vary depending on the file size and server load, which can be a drawback for users needing quick results.

Analysis of PDFAnnotations

Overall verdict

  • PDFAnnotations appears to be a niche tool focused on enabling annotation and markup features for PDF documents, useful for collaborative review and document markup, though I lack comprehensive, verified data on its full performance, pricing tiers, and user satisfaction metrics.

Why this product is good

  • Provides dedicated tools for adding comments, highlights, and markup directly to PDF files
  • Likely simplifies collaborative review workflows without requiring full desktop PDF editing suites
  • May offer a more focused, lightweight alternative to bulkier PDF software for annotation-specific tasks
  • Web-based accessibility could allow annotation work across different devices without installation

Recommended for

  • Individuals or teams who primarily need PDF markup and commenting without full editing capabilities
  • Students or researchers annotating academic papers and documents
  • Professionals conducting document reviews who need a simple annotation-only tool
  • Users seeking a lightweight, focused alternative to comprehensive PDF editors

PDFAnnotations videos

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Sumnotes videos

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Sumnotes tutorial/pdf extractor/highlights extractor

Category Popularity

0-100% (relative to PDFAnnotations and Sumnotes)

PDFAnnotations

Sumnotes

Notes
100 100%
Notes
0% 0
PDF Tools
0 0%
PDF Tools
100% 100
Productivity
26 26%
Productivity
74% 74
Office & Productivity
0 0%
Office & Productivity
100% 100

Questions & Answers

As answered by people managing PDFAnnotations and Sumnotes.

What makes your product unique?

PDFAnnotations's answer

PDFAnnotations is unique because it operates 100% locally in the user's browser using WebAssembly. Unlike traditional extractors that require uploading sensitive documents to cloud servers, PDFAnnotations parses files completely offline. It also features a visual, interactive Template Designer that allows active readers to format their extracted highlights into custom native Markdown, Obsidian Callouts, or Notion blocks with complete metadata preservation.

Why should a person choose your product over its competitors?

PDFAnnotations's answer

A user should choose PDFAnnotations over competitors due to three key advantages: absolute data privacy, extreme cost efficiency, and deep note-taking integration. It requires no signup, no subscriptions, and no file uploads, serving as a robust free/freemium alternative to expensive cloud sync services like Readwise. Additionally, its "Sentence Mode" context preservation, multi-level comment reply extraction, and highly customizable formatting templates are specifically optimized for modern knowledge workers, which generic PDF readers do not support.

How would you describe the primary audience of your product?

PDFAnnotations's answer

The primary audience of PDFAnnotations consists of students, researchers, academics, legal professionals, and digital note-takers (PKM enthusiasts). It is designed specifically for active readers who frequently annotate academic papers, textbook PDFs, or legal contracts, and need a frictionless, secure way to move those highlighted concepts and reviewer comments into structured personal knowledge bases like Obsidian, Notion, or Logseq.

What's the story behind your product?

PDFAnnotations's answer

PDFAnnotations was born out of frustration. As researchers and avid readers, we found ourselves spending hours manually copying and pasting highlighted quotes and comments from PDF textbooks and research papers into our note-taking apps. Existing cloud-based tools either required expensive monthly subscriptions or forced us to upload confidential PDFs to external servers, violating our data privacy requirements. We decided to build a lightweight, browser-local, WebAssembly-powered tool that solves this friction instantly with zero security risks.

Which are the primary technologies used for building your product?

PDFAnnotations's answer

HTML5, TypeScript, WebAssembly (WASM) for lightning-fast client-side PDF parsing, and Tailwind CSS.

Who are some of the biggest customers of your product?

PDFAnnotations's answer

  • Independent researchers and academic scholars
  • Graduate and PhD students managing literature reviews
  • Legal professionals reviewing contract comments and redlines
  • Digital PKM (Personal Knowledge Management) enthusiasts
  • Avid book readers and self-learners

User comments

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What are some alternatives?

When comparing PDFAnnotations and Sumnotes, you can also consider the following products

PdfHighlights - PdfHighlights extracts and exports all your PDF highlights and PDF annotations from all your PDF files into a single report.

Readwise - Effortlessly rediscover and organize your Kindle highlights

Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.

Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.

DocMadeEasy - Edit and sign PDF. Send files safely and securely using end-to-end encryption with 256-bit AES. PDF document management and conversion.

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