Best PDF Annotation Alternatives in 2026
PDF annotation — adding highlights, comments, drawings, and text markup to documents — has historically required Adobe Acrobat, which costs hundreds of dollars per year per seat. For individuals, students, and small teams, paying this subscription just to mark up documents and add comments is not a reasonable trade-off. In 2026, the alternatives to Adobe Acrobat for PDF annotation are better than ever. Several free options provide the most commonly needed annotation features, and some genuinely exceed Adobe's interface in ease of use. The right alternative depends on what you actually need to do: casual highlighting versus legal redlining versus collaborative team review all have different requirements. This guide covers the most practical free and low-cost PDF annotation alternatives, how each one compares for specific use cases, and when to pair annotation tools with LazyPDF's file management tools for a complete workflow.
Built-In OS PDF Annotation Tools
Before installing anything, check what your operating system already provides. macOS Preview is a powerful PDF annotation tool that is available on every Mac at no cost. It supports highlighting, text annotations, freehand drawing, shapes, signatures, and form filling. For most casual annotation needs — reviewing a document, adding comments, marking up a proposal — Preview is completely sufficient and faster to open than any standalone app. On Windows 11, Microsoft Edge has built-in PDF annotation capabilities. Open any PDF in Edge and the toolbar provides highlighting in multiple colors, text notes, and freehand drawing. No installation required and it launches instantly. For users who do annotation occasionally, Edge is an entirely adequate tool. iOS and Android both include annotation capabilities in their built-in PDF viewers. On iPhone and iPad, the Markup tool in Files allows highlighting and drawing on PDFs. Android's built-in viewer varies by device but most modern Android phones provide basic annotation through the native PDF viewer or through Google Drive's PDF viewer.
- 1On Mac: open your PDF in Preview and use the Markup toolbar for highlights, comments, and shapes
- 2On Windows: open your PDF in Microsoft Edge and use the annotation toolbar at the top
- 3On iPhone/iPad: open PDF in Files app and tap the Markup icon in the top right corner
- 4Test your built-in tool before installing anything — it likely handles your annotation needs
Browser-Based Annotation Options
Several free web-based tools provide annotation without installation, working on any device with a browser. PDF.js (the open-source PDF viewer behind Firefox's built-in PDF viewer) has a growing ecosystem of browser-based annotation tools built on top of it. Adobe's own Acrobat free tier allows basic annotation for free after account creation — if you have an Adobe account from Creative Cloud or another product, you likely already have access to basic annotation in Acrobat Web. This provides the familiar Adobe interface without the full subscription cost. For teams doing collaborative review, tools like Smallpdf and PDF Annotator Web provide multi-user annotation with comment threads. These require accounts but have free tiers sufficient for occasional use. Google Drive's built-in PDF viewer allows highlighting and comments when viewing PDFs in Chrome — a useful option for teams already working in Google Workspace.
- 1Try Google Drive's built-in PDF viewer first if you work in Google Workspace — it annotates without extra tools
- 2Use Adobe Acrobat Web (free tier) if you already have an Adobe account — familiar interface
- 3For collaborative team review, tools like Smallpdf provide multi-user comment threads
- 4For completely tool-free annotation, Chrome or Firefox's built-in PDF viewers handle basic highlights
Convert to Word for Tracked Changes Annotation
For document review workflows where the goal is suggesting edits and changes rather than just adding comments, converting the PDF to Word and using track changes is often more effective than PDF annotation. Word's track changes feature is the de facto standard for collaborative document editing, and converting a PDF to Word puts you in that workflow immediately. LazyPDF's pdf-to-word converter creates an editable Word document that you can review with track changes enabled. Enable track changes in Word (Review > Track Changes), make your suggested edits, add comments where needed, and send the marked-up Word file back to the document owner. They can accept or reject each suggestion individually — a much more powerful review workflow than PDF comment annotations. For legal contracts, academic papers, policy documents, and any document where the reviewer's goal is to suggest specific text changes, the Word track changes approach is more practical than PDF annotation. The limitation is that very complex PDF layouts may not convert perfectly to Word, so verify the converted document looks correct before adding your review markup.
- 1Convert the PDF to Word using the pdf-to-word tool
- 2Open the Word document and enable Track Changes: Review > Track Changes > Track Changes
- 3Make suggested edits directly in the text and add comments using the Comments panel
- 4Send the marked-up Word document back to the document author for review
When You Actually Need a Full Annotation App
For heavy annotation users — teachers grading many documents, lawyers redlining contracts daily, researchers annotating papers systematically — the free alternatives may be insufficient. For these users, low-cost dedicated annotation apps are worth considering: Notability and GoodNotes on iPad, Xodo on Windows and Android, and PDF Expert on Mac offer professional-grade annotation at a fraction of Adobe's subscription cost. Xodo is free and provides a genuinely strong annotation experience on Windows, Android, iOS, and in the browser. For users who need professional annotation across multiple devices without a large subscription, Xodo is one of the best options available. PDF Expert on Mac is a one-time purchase (not a subscription) that provides near-Acrobat annotation capabilities. For Mac users who do heavy annotation work and want a permanent tool without annual fees, PDF Expert is the strongest recommendation. Pair it with LazyPDF for file operations (compression, merging, conversion) and you have a complete PDF workflow without any recurring costs.
- 1For heavy annotation on multiple platforms: download Xodo (free) for a consistent cross-device experience
- 2For iPad-primary users: consider Notability or GoodNotes for handwriting and detailed markup
- 3For Mac users doing professional annotation: PDF Expert (one-time purchase) provides full annotation features
- 4Pair your annotation tool with LazyPDF for compression, merging, and conversion — the tools complement each other
Frequently Asked Questions
What is the best free PDF annotation tool for students?
For Mac users, Preview is hard to beat — it is free, built-in, and handles highlighting, notes, and drawing well enough for academic annotation. For Windows students, Microsoft Edge's built-in PDF annotator is excellent and requires no installation. For students who work across multiple devices, Xodo (free, cross-platform) is the strongest option. All three allow highlighting, text notes, and drawing without any subscription or account requirement.
Can I annotate PDFs without creating an account?
Yes. macOS Preview, Microsoft Edge, iOS Files app markup, and Xodo all work without account creation. For browser-based annotation, PDF.js-based tools and some simple online annotators also work without accounts. If you need occasional lightweight annotation, these no-account options are entirely adequate. The main functionality that typically requires accounts is cloud sync and multi-device access to your annotations.
How do I remove annotations from a PDF before sharing it?
The cleanest way to remove all annotations from a PDF is to print it to a PDF printer (File > Print > Save as PDF on Mac, or Microsoft Print to PDF on Windows). Printing to PDF flattens the document, removing all annotation layers and producing a clean version without markup. Alternatively, if you want to keep the original annotated version and share a clean copy, use this print-to-PDF method to create the clean version separately without modifying your annotated original.