Not all PDF readers are created equal. Some are bloated, some are slow, and some come bundled with junk you never asked for. After testing the most popular free PDF readers on Windows, here are the ones worth your time.

What Makes a Good PDF Reader?

Before we get into the list, the criteria that actually matter:

• Speed — Opens instantly, scrolls smoothly on large files
• Lightweight — Uses minimal RAM and disk space
• Annotation support — Highlight, underline, add notes
• Search — Fast text search across documents
• No bloat — No ads, no toolbars, no unnecessary features
• Privacy — Does not phone home or collect your data

1. Sumatra PDF — Best for Speed

If you just want to open PDFs fast with zero fuss, Sumatra PDF is unmatched.

• Size: Under 10MB
• Startup: Instant
• Formats: PDF, EPUB, MOBI, CBZ, XPS, DjVu
• Annotation: Limited (basic bookmarks only)
• Best for: Reading long documents, ebooks, and manuals

Sumatra is open source, has zero ads, and starts faster than any other reader. The tradeoff is limited annotation tools. If you only need to read, not edit, this is the one.

2. Adobe Acrobat Reader DC — Best for Compatibility

The original PDF reader. Still the most compatible with complex PDFs.

• Size: ~250MB
• Startup: Moderate (faster than it used to be)
• Annotation: Full (highlight, comments, stamps, signatures)
• Best for: Forms, signed documents, anything with interactive features

Adobe Reader gets criticized for bloat, but it handles complex PDFs better than anything else. If a form does not work in other readers, it will work here. Just be careful during installation — uncheck the optional McAfee offer.

3. Foxit Reader — Best Balance

A solid middle ground between lightweight and feature-rich.

• Size: ~150MB
• Startup: Fast
• Annotation: Full suite (highlight, comments, drawing tools)
• Best for: People who need annotation without the Adobe weight

Foxit has been around for years and earns its reputation. The free version covers everything most people need. The tabbed interface is a nice touch for working with multiple documents.

4. Microsoft Edge — Best Built-in Option

Yes, your browser is now a genuinely good PDF reader.

• Size: Already installed
• Startup: Instant (it is already running)
• Annotation: Basic (highlight, add text, draw)
• Best for: Quick viewing and basic markup

Edge has quietly become one of the better PDF readers on Windows. It handles read aloud, text highlighting, and ink annotations. For 80% of PDF tasks, you do not need anything else.

5. PDF-XChange Editor — Best for Power Users

Packed with features in the free version.

• Size: ~200MB
• Startup: Fast
• Annotation: Extensive (comments, stamps, measuring tools)
• Best for: Technical documents, blueprints, detailed review work

The free version of PDF-XChange Editor includes more features than most paid readers. The measuring tools make it popular with architects and engineers. Some advanced features are locked behind the pro version, but the free tier is generous.

Quick Comparison

• Fastest: Sumatra PDF
• Most compatible: Adobe Acrobat Reader DC
• Best annotation: Foxit Reader
• No install needed: Microsoft Edge
• Most features free: PDF-XChange Editor

Which One Should You Pick?

For most Windows users, Microsoft Edge handles everyday PDF needs perfectly fine. If you need more annotation tools, grab Foxit Reader. If raw speed is your priority and you only read (not edit), Sumatra PDF is the clear winner.

The one to avoid: any random free PDF reader you find through a Google ad. Many are bundled with adware or worse. Stick with the established options above.