Best PDF reader for Mac in 2026 — free alternatives to Preview

Why Preview is the baseline

Apple Preview ships with every Mac, has been the default PDF reader since macOS Tiger in 2005, and uses the same Quartz PDF rendering pipeline that powers PDF display across the operating system.¹ It is fast, free, and tightly integrated with iCloud Drive, AirDrop, Spotlight, and the share sheet. The Markup tool inside Preview supports highlighting, drawing, text boxes, signatures, and shape annotations; the Tools menu handles page rotation, deletion, insertion, and reordering; the Pencil submenu writes annotations directly onto the page.

The case for an alternative starts when one specific thing Preview does not handle — OCR-to-searchable-text, multi-document review with collaborator comments, scholarly note management, or cross-platform-consistent annotations — becomes the dominant part of your workflow. Below is each alternative and the case that justifies it.

Six free PDF readers, at a glance

Feature matrix — the five desktop readers

Speed and memory measurements below were taken on an M2 MacBook Air with the same test 200-page PDF (a scanned legal brief). Treat them as directional rather than precise — your numbers will vary with the specific PDF and the rest of your system load.

Detailed take on each reader

Preview — the default that is hard to beat

Preview is the right default for 90% of Mac users. It starts in under a second, uses the system PDF stack, integrates with AirDrop / iCloud / Mail, and exposes a Markup toolbar that covers highlights, signatures, shapes, text, and ink. The signature feature is particularly good — you can save signatures drawn with the trackpad or captured via the camera, and reuse them across documents. Where Preview is weak: no embedded OCR to convert a scanned PDF into searchable text, no collaborator-review pipeline, no tabbed multi-doc UI (until Sonoma — Sonoma+ does support PDF tabs).

PDF Expert Reader — for serious annotators

Readdle's PDF Expert is the most-polished commercial PDF reader on macOS, and the free Reader tier is genuinely useful — clean tabbed UI, full annotation toolset, highlight palette customisation, side-by-side viewing of two documents. The paid Pro tier ($79.99/year as of May 2026) adds editing, OCR, page management, and redaction. For users who annotate hundreds of pages a year, the free tier alone is often more pleasant to use than Preview.

Foxit PDF Reader — cross-platform parity

Foxit's claim is the same experience across Windows, macOS, Linux, iOS, and Android. If your team is mixed-platform and you need annotations and signatures to survive between Windows and Mac colleagues without surprises, Foxit is the easiest path. The free reader handles annotations, signatures, and AcroForm + XFA form fill; advanced features (OCR, editing, batch tools) are paid.

Adobe Acrobat Reader DC — the corporate standard

Adobe Reader is the reference implementation for PDF — when an external counterparty sends you a complex form, an Adobe-pipelined review, or a deck with non-standard PDF features, Adobe Reader will display it most faithfully. The trade-off is resource cost (heavier than alternatives) and Adobe's persistent push toward Document Cloud during onboarding. For workflows that involve external Adobe-using counterparties, it is worth installing alongside (not instead of) Preview.

Skim — the academic reader

Skim is an open-source macOS PDF reader designed for academic reading. Its standout feature is note management: notes are first-class objects with their own sidebar, export formats (RTF, BibDesk, plain text), and persistence model. If you read research papers for a living, Skim's note pipeline is materially better than Preview's. For non-academic everyday PDF reading, it is overkill — Preview is sufficient.

ScoutMyTool in Safari — no desktop install at all

For active tasks Preview cannot do — signing, watermarking, adding page numbers, merging, splitting, compressing — ScoutMyTool's browser-based tools work in Safari with zero install. The combined "Safari (read) + ScoutMyTool (edit)" workflow replaces most of what paid PDF apps charge for, and keeps every file on your machine because the tools run client-side. Useful for users who do not want to install any additional desktop apps.

Which one to pick — a short decision tree

1. Do you mostly read and annotate casually? Stick with Preview. You do not need anything else.
2. Do you read dozens of academic papers a week and take notes? Install Skim. Free, open source, designed for the job.
3. Do you annotate hundreds of pages a year and want a polished UI? Install PDF Expert Reader. Free tier alone is excellent.
4. Do you work with Windows colleagues who use a non-Apple PDF tool? Install Foxit. Cross-platform parity reduces "looks wrong on their side" friction.
5. Do external counterparties send Adobe-pipelined documents? Install Adobe Acrobat Reader DC. Use it just for those documents; keep Preview as the default.
6. Do you need to actively edit PDFs (sign, watermark, page-number, merge, split, compress)? Add ScoutMyTool's browser tools to your bookmarks for any reader you choose.

Related ScoutMyTool tools and articles

• All free PDF tools — the browser-based toolbox.
• Sign PDF — add a signature without installing a desktop app.
• Add Watermark — stamp confidentiality or "draft" labels.
• Merge PDF — combine multiple PDFs in the browser.
• Compress PDF — shrink a PDF before emailing.
• PDF Form Fill — fill AcroForm fields without Acrobat.
• Adobe Acrobat free alternatives — broader Acrobat-replacement piece.
• How to e-sign a PDF on iPhone — the mobile side of the same workflow.

Frequently asked questions

Is Apple Preview actually good enough, or do I need a paid alternative?

For most users, Preview is more than good enough. It is fast, handles annotations, fills AcroForm fields, has a Markup tool that supports drawing signatures, and integrates with iCloud Drive, AirDrop, and the rest of the macOS share sheet. It will not OCR a scanned PDF (Live Text covers reading images but not embedded as a searchable text layer), it does not have a polished comments-and-review pipeline for collaborative editing, and it lacks the per-tab UI that some annotators prefer. If those three limits do not affect your workflow, you do not need to install anything else.

Which reader is the lightest on resources?

Apple Preview is the lightest — it ships with macOS, uses the system Quartz PDF rendering pipeline, and a typical 200-page PDF sits around 70 MB of RAM with sub-second open time on an M-series Mac. Skim comes second at around 90 MB for the same document. Foxit and Adobe Acrobat Reader DC are heavier (180 MB and 280 MB respectively) because they bring along their own rendering stacks and feature subsystems. For older Macs or constrained-memory situations, Preview or Skim are the right picks.

When does Adobe Acrobat Reader DC make sense on a Mac?

When your workflow involves receiving PDFs from external counterparties who use Adobe-branded review tools (legal, large enterprise, government). Adobe Reader handles their comments and form fields with the highest fidelity, including the structured "Send for review" workflow that many corporate teams rely on. For purely personal reading and annotation, the resource cost rarely justifies it.

What is Skim, and who is it for?

Skim is an open-source PDF reader for macOS that was designed specifically for academic reading. Its differentiator is note-taking: you can attach text notes to specific selections, manage them in a sidebar separate from the document, export them as RTF or plain text, and sync them across devices. It does not aim to be a general-purpose PDF tool — no advanced form fill, no signing — but for researchers reading and annotating dozens of papers, the note-management system is materially better than what Preview offers. Free and BSD-licensed.

Are PDF readers safe with confidential PDFs?

All five desktop options in this article are safe for confidential PDFs because they run entirely on your machine and do not upload documents to vendor cloud services by default. The exceptions to watch for: Adobe Acrobat Reader DC pushes Adobe Document Cloud aggressively in onboarding flows — decline if you do not want copies syncing to Adobe. PDF Expert offers iCloud and Readdle cloud sync — fine if you trust those, off-able otherwise. ScoutMyTool runs in the browser and explicitly never uploads files (you can verify this by watching the network tab during any operation).

Can I use the browser instead of installing a desktop reader?

For reading-only, yes — Safari, Chrome, Firefox, and Edge all render PDFs natively at high quality with annotation toolbars and search. The browser is a perfectly good reader for casual use. For active editing — signing, watermarking, merging, splitting, adding page numbers, filling AcroForms — combine the browser PDF viewer with ScoutMyTool's task-specific tools (each runs in the browser tab without uploading the file). The combined "Safari + ScoutMyTool" path replaces what most paid PDF apps charge for.

What about Mac App Store readers I have not heard of?

The Mac App Store has dozens of "PDF Reader" apps, many of which use evasive freemium tactics: free to download, with most useful features behind a one-time or recurring purchase. Before installing, check (a) the Privacy Policy section in the App Store listing for what data the app collects, (b) the recent review history for paywall complaints, and (c) the developer's other apps for pattern signals. The five free options in this article have been audited by enough users that any privacy or paywall surprises would be public knowledge by now.