SumatraPDF vs Adobe Acrobat Reader

SumatraPDF: what it's good at

SumatraPDF opens documents almost instantly and stays out of the way, reading PDF, ePub, MOBI, CBZ, DjVu and XPS. A refreshing alternative to heavyweight readers when all you need is to read a document.

• Opens documents near-instantly
• Reads PDF, ePub, MOBI, DjVu and CBZ
• Portable single-executable option
• Tiny installation footprint

Adobe Acrobat Reader: what it's good at

Acrobat Reader is the official reader from the company that created the PDF format, giving it the most reliable rendering of complex documents, interactive forms and digital signatures. Free to read, annotate and sign.

• Reference-quality PDF rendering
• Fills and submits interactive forms
• Comment and annotate documents
• Digital signature support

Which should you choose?

Both are free, so the honest answer is that you can install either and decide for yourself — that is the advantage of free software over a paid trial.

Both run on Windows. Only Adobe Acrobat Reader supports macOS, Android, iOS. If open source matters to you, SumatraPDF publishes its source code and Adobe Acrobat Reader does not.

We deliberately do not publish a star rating for either. We have no way to verify a rating that would be honest at scale, and an invented one would be worse than none — so we give you the facts and let you decide.

Frequently asked questions

Is SumatraPDF better than Adobe Acrobat Reader?

Neither is universally better. SumatraPDF extremely fast, minimal PDF and ebook reader, while Adobe Acrobat Reader the reference PDF reader, from the format's creator. The right pick depends on your platform and workflow.

Are both really free?

SumatraPDF is open source and Adobe Acrobat Reader is free tier. Both can be downloaded without paying.

Can I install both?

Yes. Since neither costs anything, installing both and comparing them on your own files is usually the fastest way to decide.