Most PDF work on Mac is reading, signing, and merging. For that, you already have everything you need installed, and you should think twice before paying for more.
Editing text, filling complex forms, running OCR on scans, batch-converting files, and redacting sensitive passages are different jobs with different tools. That is where paid apps earn their keep, and where picking the wrong one means paying for a subscription you open twice a year. This roundup starts with the free built-in, adds a no-install browser option for one-off merges, then covers three dedicated apps: a friendly daily driver, a business workhorse, and a free research reader. Match the app to the job you repeat weekly.
Preview
Preview ships with every Mac and handles the basics well. Reading, search, page thumbnails, merge by drag and drop, split, rotate, annotate, highlight, and sign with trackpad or camera.
It is fast and free, and it stays out of the way. For combining two PDFs or signing a contract, open Preview before installing anything.
The trade-off is editing power. You cannot reflow text paragraphs, run OCR on scans, redact securely, or convert PDFs to Word cleanly. Large scanned files also search poorly without OCR.
Best for:
- Reading, merging, splitting, and signing
- Quick highlights and comments
- Zero-cost everyday PDF work
No-install option: BrowserStay merge tool
If you just need to combine PDFs once, installing an app is overkill. The BrowserStay merge-pdf tool runs in your browser with no install and no account.
Files process locally in the page, which fits the privacy-first approach. Drag in your PDFs, reorder, merge, download. Done.
The trade-off is scope. It merges. It does not edit, OCR, or redact. For anything beyond combining files, use one of the apps below.
Best for:
- One-off merges on any machine
- No-install, no-account workflows
- Privacy-conscious browser-based combining
PDF Expert
PDF Expert is the friendly upgrade from Preview. Reading is fast, annotation feels natural, and editing text, filling forms, and signing work without a manual.
It hits the sweet spot for students and professionals who live in PDFs but do not need enterprise redaction suites. There is a free reading tier, with a subscription or one-time purchase unlocking edit and OCR.
The trade-off is cost for heavy editors. If you need batch OCR, advanced redaction, or Windows parity across a team, other tools go further.
Best for:
- Daily reading plus light editing
- Forms, signatures, and clean annotation
- A nicer Preview replacement
Nitro PDF Pro
Nitro PDF Pro is the workhorse pick. It covers edit, convert, OCR, batch processing, redaction, and eSign in one package aimed at business use.
If your week involves scanned contracts, Word conversions, and combining large reports, the batch tools save hours. It uses a one-time purchase model rather than forcing a subscription.
The trade-off is interface density. It packs a lot in, which can feel heavy next to PDF Expert. Casual readers should stick with Preview.
Best for:
- OCR on scanned documents
- Batch convert, combine, and redact
- Business workflows without a subscription
Skim
Skim is free, open source, and built for research. It excels at reading academic papers: smart bookmarks, notes in the sidebar, highlight styles, and integration with reference managers.
It is lightweight and fast on huge PDFs that make other readers stutter. If you annotate papers daily, the note navigation alone is worth it.
The trade-off is editing. Skim does not edit PDF text or run OCR. It is a reading and research tool, not a form filler. Pair it with Preview for merges and signatures.
Best for:
- Academic papers and long documents
- Free research-focused annotation
- Fast navigation through notes
Which should you get
Start with Preview. Use the browser merge tool when you cannot install anything. Move to PDF Expert for comfortable daily editing, Nitro PDF Pro for OCR and business batch work, and Skim for research reading.
Do not pay for features you use twice a year. Match the app to the job you repeat weekly.
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