The Best PDF Reader in 2026: 6 Free Picks
Looking for the best PDF reader? Six free options for Windows, Mac and phones, ranked honestly with what's free, what's paid and where each one falls short.
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You open PDFs every day, and you just want something that opens them fast, shows them properly and lets you sign the odd form without nagging you to upgrade. That’s a surprisingly high bar. A lot of “best PDF reader” lists are written by companies that sell a PDF editor, and somehow their own product always wins.
We don’t sell one. We ranked these free readers on what matters when you’re reading, not editing: speed, how faithfully they display tricky files, form filling and signing, and how much the free version pushes you towards a paid plan. Your browser and the Mac’s built-in Preview are fine for the basics, so everything below has to beat them at something.
1. Adobe Acrobat Reader
Best for anyone who needs every PDF to just work, forms included.
Adobe invented the format, and Adobe Acrobat Reader is still the reader that gets complicated documents right. Government forms, files with odd fonts, documents with certified digital signatures. When something renders strangely elsewhere, Reader is usually the fix. The free version lets you view, print, comment, fill in forms and sign, and it runs on Windows, Mac, iPhone, Android and the web.
The downside is everything Adobe wraps around that. It’s a big install, it’s slower to open than the lighter readers here, and the interface is full of buttons for tools you can’t use without paying. Editing text, converting files and the AI Assistant all sit behind paid plans.
Price Free. Paid plans start with Acrobat Standard at $14.99 a month on an annual plan, and Acrobat Pro is $19.99 a month on an annual plan.
2. SumatraPDF
Best for Windows users who want a reader that opens instantly.
SumatraPDF is tiny, fast and completely free, with no ads or bundled extras. It opens a PDF before heavier apps have finished drawing their splash screen. It also reads EPUB and MOBI ebooks, comic book files, DjVu and XPS, so it doubles as an ebook reader for the laptop.
It’s Windows only, and it’s a reader in the strictest sense. You can highlight text, but don’t expect proper form filling, signatures or a comments panel. That’s the point of it, and we’d keep it installed as the default viewer even if you use something heavier for the rare form. There’s even a portable version you can run from a USB stick.
Price Free and open source.
3. Foxit PDF Reader
Best for people who want Acrobat’s feature set without Adobe.
Foxit PDF Reader has long been the main free rival to Acrobat Reader, and it covers nearly the same ground. Viewing, form filling (including the awkward XFA forms some organisations still use), comments, shared reviews, signing and signature checks. It runs on Windows, Mac, iPhone, Android and the web.
It’s a good pick for offices, too. IT teams can deploy it with Group Policy and switch off JavaScript in PDFs, which matters if your inbox attracts dodgy attachments.
The trouble is that it’s no longer the lightweight alternative it once was. The install is large, the ribbon interface is busy, and there are frequent prompts to try Foxit PDF Editor. If you wanted to get away from Acrobat’s clutter, Foxit swaps one kind for another.
Price Free. The paid Foxit PDF Editor has a 14-day trial.
4. PDF-XChange Editor
Best for Windows users who mark up a lot of documents.
PDF-XChange Editor has one of the best sets of annotation tools you can get for free. Highlights, sticky notes, shapes, measurement tools and a comments list that makes reviewing long reports manageable. It’s quick, too, and the free version is allowed for commercial use as well as at home.
There’s a catch you need to know before you start. Many menu items are paid features, and if you use one in the free version, the saved file gets a “demo” watermark. Comments and highlights are safe, but it’s easy to click the wrong tool and ruin a document you’re about to send. The interface is also crowded, and it’s Windows only.
If you like it, the paid licence is a one-off purchase rather than a subscription, which is rare now.
Price Free with watermarked paid features. Editor licences start at $62, with a year of maintenance included.
5. PDFgear
Best for a free reader that can also edit, merge and convert.
PDFgear is the newest name here and the most generous. It’s free, there’s no sign-up, and it goes well past reading: editing text, merging and splitting files, converting to Word and an AI chat that can summarise a long document. It runs on Windows, Mac, iPhone and Android, plus a browser version.
The weakness is uncertainty. PDFgear doesn’t publish a clear business model or a firm promise to stay free, and a company has to make money somehow. Expect the terms to change at some point. It also has a shorter track record with difficult files than Adobe or Foxit, so keep Acrobat Reader around for official forms.
Price Free, with no paid plan advertised at the moment.
6. Skim
Best for students and researchers reading papers on a Mac.
Skim is a free, open-source Mac reader built for academic reading. You can highlight and add notes quickly, see every note in a side panel, take snapshots of figures to keep beside the text, and export your notes. It also works with LaTeX and SyncTeX, which matters a lot if you write papers and very little if you don’t.
It’s Mac only, and the interface looks dated next to Preview. Form filling and signing aren’t its focus, so for paperwork you’ll still use Preview or Acrobat Reader. As a study tool, though, it beats Preview easily.
Price Free and open source.
How to choose
If you only install one reader, make it Adobe Acrobat Reader, because it handles the files other readers get wrong. On Windows, pair it with SumatraPDF as your fast default viewer and you’ve covered nearly everything. Pick Foxit if you want Acrobat’s feature list from someone else, and PDF-XChange Editor if you annotate all day and can live with its free version’s watermarks. PDFgear is the one to try if you also need to edit or convert for free. Mac users who read papers should get Skim, and Linux users should look at Okular, KDE’s free reader, which also runs on Windows.
Whichever you choose, set it as your default PDF app. Half the frustration with PDFs is the wrong program opening them.