Every Windows PC can open a PDF, in the sense that every Windows PC has Edge, and Edge will grudgingly render a PDF in a browser tab. That works until it doesn't: the 900-page manual that takes thirty seconds to scroll, the form you need to fill and sign, the document with the highlight annotations your colleague added that render as mysterious yellow smudges.
A dedicated PDF app fixes scrolling, searching, annotating, and signing. The four below cover the full range of weight and price, from a reader measured in megabytes to Adobe's free flagship. And if you just need to merge a few PDFs together occasionally, there is a browser-based option at the end that skips the install entirely.
SumatraPDF: the featherweight
SumatraPDF is free and open source, and it does one thing: it opens documents instantly. PDFs, plus EPUB, MOBI, CBZ/CBR comics, and a handful of other formats, all in a window that appears before you have finished moving the mouse. It starts fast, renders fast, stays out of your way, and has earned a devoted following among people who open a lot of PDFs and read them.
The trade-off is that reading is all it does. No annotations, no form filling, no signing, no editing. If your PDF life is "open, read, close," that trim is a feature. If you ever need to tick a box in a form, SumatraPDF will show you the form you cannot fill.
Pick it if: you read many PDFs and value speed above all else.
Foxit PDF Reader: the practical middle
Foxit Reader is free for personal use and hits the practical middle: full annotation tools — highlights, notes, drawing — plus form filling and document signing. It is light on its feet for what it does, starts quickly, and its free tier covers what most people actually need from a PDF app.
The trade-offs worth knowing: Foxit has historically tried to bundle extra software during installation, so read the installer's screens instead of clicking through. And the free tier exists to introduce the paid version, so expect prompts and feature teasers. Neither is a dealbreaker, but both are friction you accept for free forms and signing.
Pick it if: you annotate, fill forms, or sign documents and don't want to pay.
Adobe Acrobat Reader: the standard, for better and worse
Adobe Acrobat Reader is the free reader from the company that created the PDF format, and some documents — particularly government forms and anything with exotic security settings — simply behave better in it. Annotation, commenting, form filling, and signing are all included, and Adobe's ecosystem means signatures and comments carry the most reliable compatibility with everyone else's tools.
The trade-offs are the reason lighter alternatives exist. Reader is the heaviest app on this list, the slowest to start, the most persistent about upgrading you to the paid Acrobat plans, and it adds background services to your PC. It is the safe default that everyone recognizes, and you pay for that safety in resource usage and upsell patience.
Pick it if: you handle forms and shared documents from many sources and want maximum compatibility.
PDF-XChange Editor: the power tool
PDF-XChange Editor is free for typical use, with paid licenses unlocking advanced features, and it packs the most capability per megabyte of any app here: rich annotation, typewriter text, stamps, measuring tools for technical drawings, OCR on scanned documents, and genuinely good editing of existing PDF content.
The trade-offs: the interface is denser than Foxit's or Adobe's — more toolbars, more options, more to learn — and the free version adds small watermarks to a few advanced operations, which reminds you the paid license exists. For anyone working with scanned or technical documents, though, the OCR and measurement tools are worth more than the learning curve costs.
Pick it if: you edit PDFs, scan documents, or work with drawings and need real tools.
No install at all: merge PDFs in the browser
Plenty of PDF tasks don't need an app at all. If what you need is combining several PDFs into one — merging scanned pages, bundling receipts, appending a signed page — BrowserStay's merge PDF tool runs entirely in your browser: drag in your files, get one merged PDF, nothing uploaded to a server to sit there later. It is the right answer when the task is small, occasional, and you would rather not install anything for it.
The trade-off is scope: browser tools handle focused jobs like merging, not reading libraries of documents or heavy annotation — that is what the desktop apps above are for.
The short version
- SumatraPDF — instant, minimal, read-only
- Foxit Reader — free annotation, forms, signing, mild upsell friction
- Adobe Acrobat Reader — maximum compatibility, maximum weight
- PDF-XChange Editor — power editing and OCR, denser interface
- BrowserStay merge — no install for quick merging jobs
Most people need exactly one desktop app, and the reading you do should decide which.
No comments yet