Top 10 Best PDF Markup Software of 2026

Xodo centers markup and review for single PDFs and multi-page documents with inline comments, callouts, and shape-based annotations. It includes measurement tooling for dimensions and distance checks, plus OCR and search assist to find text inside scanned pages. Review workflows benefit from revision-style viewing, comment sorting, and markup summaries that help teams move from discussion to a deliverable. Browser use supports lightweight reviews without requiring a full desktop install.

A key tradeoff is that deeper governance controls are not the primary experience, so large organizations often need external process controls to manage who can create and distribute review links. Xodo fits best when project teams need fast visual feedback on technical drawings, contracts, or scanned documents with a mix of image-based and text-based content.

Drawboard PDF is a strong fit for review cycles where markups must stay visually accurate, including dimension-style measurement workflows and consistent vector-style annotations. Commenting works as an annotation object tied to the page view, and the markup can be flattened for export so downstream viewers see a stable result. The tool also supports a structured annotation experience for comparing document versions so reviewers can spot what changed across iterations.

A key tradeoff is that deep automation and governance depend on how teams integrate Drawboard PDF into their document pipeline, since the product is primarily an authoring and markup client rather than a full review management backend. It works best when teams already have a document distribution and versioning process, and they need a high-precision markup layer that can be exported or flattened for final review artifacts.

Nitro PDF Pro’s markup workspace includes comment threads, revision-style marks, and measurement tools for technical document reviews. The app can convert scanned content to editable text through OCR so markup can be tied to selectable content when the source is image-based. Nitro adds practical review control with permissions and PDF security settings that reduce the chance of accidental edits after review.

A key tradeoff is that deep review collaboration features rely more on Nitro’s workflow ecosystem than on a lightweight browser-only review loop. Nitro PDF Pro fits best when reviewers need desktop-grade annotation precision for recurring document types such as policies, technical diagrams, and contract exhibits.

LiquidText turns PDF markup into an interactive reading workflow with linked notes and expandable highlights. It supports freeform annotation and document comparisons using extracted text views rather than only flattening comments into a static layer.

The tool focuses on annotation, note organization, and markup export, which fits research review and synthesis more than form-centric editing. Compared with typical browser-based viewers, LiquidText emphasizes navigation across many sources from a shared note canvas.

PDF Annotator provides a browser-based PDF markup workflow for highlights, shapes, and comments on uploaded documents. It supports common review artifacts such as sticky note comment markers, text box callouts, and stamp-like annotations, with an exportable markup summary for teams.

The editor focuses on fast in-document edits and a revision-friendly output, rather than document authoring. Workflow support is strongest when reviewers need visible annotations that remain readable across share and re-open cycles.

Notability is a desktop and mobile PDF markup tool built around pen-first note taking and lightweight annotation workflows.

It supports handwriting and typed annotations, comment-style notes, and page-centric organization that works well for marking up documents during reading and training.

Markups can be exported as PDFs, so annotated output remains portable across tools that understand standard PDF rendering.

Notability also includes search over written content, which helps when revisiting decisions made on specific pages.

Adobe Acrobat pairs a desktop PDF editor with review workflows that support both local and managed deployments. Markup is extensive, covering text and shape annotations, comment threads, and revision-style markup, with tools for handling scanned pages through built-in OCR.

Acrobat also supports document protection tasks like redaction and signature certificate based signing, with options for flattening and exporting marked output. Compared with simpler annotators, the feature mix stays tightly integrated inside the same authoring and review experience.

Nitro PDF Pro focuses on desktop-first PDF markup with annotation tools that support common review workflows. It includes revision-oriented features like revision tracking with markup display modes and document comparison for spotting changes across versions.

The tool set covers core commenting actions such as sticky note comments, shapes, stamps, and text callouts, plus export options that summarize markup. Nitro PDF Pro is distinct for how it handles review artifacts across multi-page PDFs and prepares documents for downstream sharing through annotation flattening and output controls.

Smallpdf performs PDF markup in a browser with comment tools for highlighting and adding notes. It also covers common document prep steps like reorganizing pages and converting files between formats before markup.

The workflow is centered on fast upload, annotate, and re-export rather than deep authoring control. Integration options and governance controls are lighter than enterprise document systems, which shifts it toward individual and small team use.

Lumin PDF is a browser-first PDF markup tool aimed at teams that need fast review cycles with shareable, editable annotations. It covers common annotation workflows like comments, stamps, highlights, and shape-based markup while keeping edits inside the PDF viewer.

Document-to-document compare tools and revision-oriented markup support help reviewers track changes during iterative reviews. Lumin PDF also includes PDF output handling for exporting annotated results and applying annotation flattening when a non-editable version is required.