Sumatra PDF

ApplicationKrzysztof Kowalczyk

Also called sumatra, sumatra pdf reader

Krzysztof KowalczykProductivity

A small free PDF, ePub, and comic reader. The process is SumatraPDF.exe. It is not Adobe Acrobat.

What you need to know

Sumatra reads PDFs. Acrobat edits them.

SumatraPDF.exe is a small viewer for PDF and several ebook formats. Adobe Acrobat is the paid editor. Reader is Adobe's free viewer. Neither Adobe exe is this project.

What is it?: Document reader
Still current?: Yes, see Current status
Official download?: Use the vendor link in this article

Feex says

If you only need to read the file, I would open SumatraPDF.exe before I install Acrobat. Editing a PDF is a different product.

What is Sumatra PDF?

Sumatra PDF is a lightweight reader. SumatraPDF.exe opens PDF, EPUB, MOBI, XPS, and comic archives. Adobe Acrobat is a paid editor. This app will not replace Acrobat's edit tools.

If you have never used it

If you only need to read a PDF, EPUB, or CBZ without Adobe's editor, this is Sumatra PDF, not Acrobat. Download it from sumatrapdfreader.org. Acrobat.exe is the paid editor. Acrobat Reader is Adobe's free viewer and a heavier install. Sumatra does not fill forms the same way and does not edit PDFs.

What is it used for?

Fast PDF reading

Open a PDF without Creative Cloud. Acrobat is the editor people confuse with any PDF window.

EPUB and comics

ePub and CBZ in the same reader. Adobe Acrobat is not an ebook library.

Portable copy

A zip build exists. That is still Sumatra, not a portable Acrobat.exe.

Who is it for?

People who want a tiny reader
Users who also open EPUBs and CBZ files
Anyone who should not pay for Acrobat just to read a syllabus PDF

Current status

Actively developed. This article is the Windows reader, not a PDF editor.

How old is it?

Krzysztof Kowalczyk started Sumatra PDF in 2006 as a small MuPDF-based reader. Adobe Acrobat dates to 1993 as a paid editor. They are not the same product family.

Versions

Major channels first. Exact build numbers are not all verified here.

Installer

Portable

System requirements

Values follow the publisher's public guidance. Workload still changes the real need.

Minimum

Minimum system requirements
Operating system	A current supported Windows 10 or Windows 11 release, per the vendor
RAM	Enough for Windows plus this app. Heavy projects want more.

Resource profile

CPU demand: Follows what you open inside the app
RAM demand: Follows documents, tabs, or libraries

Installed processes

These executables belong to this product when it is installed.

Installed processes
SumatraPDF.exe	Reader window

Startup components

Sumatra starts when you open a file. It should not start with Windows.

File locations

Common Sumatra PDF locations
Typical install	C:\Program Files\SumatraPDF\SumatraPDF.exe

File formats

PDFEPUBMOBICBZXPS

Common problems

Form fields or signatures missing

Sumatra is a reader. Use Acrobat, Reader, or another editor for filled forms.

People download Acrobat when they wanted a tiny viewer

get.adobe.com/reader is Adobe. sumatrapdfreader.org is this app.

Getting unstuck

Install from sumatrapdfreader.org only

Search ads for "PDF reader free" often push other toolbars. The project site is the source.

Set a default app in Windows Settings if PDFs still open in Edge

That is a file association, not a broken Sumatra install.

If you needed to edit text in the PDF, use Acrobat or another editor

Sumatra will not grow those tools. That is the sibling-swap test with Acrobat.

Alternatives

Adobe Acrobat Reader, Foxit PDF Reader, and Edge overlap for viewing. Acrobat Pro is the paid editor sibling.

Official help and downloads

Start with the vendor. Random exe sites are not a support channel.

Official contacts
Download	www.sumatrapdfreader.org/download-free-pdf-viewer Official installer or vendor page
Help	www.sumatrapdfreader.org/docs/ Vendor support
Official site	www.sumatrapdfreader.org/download-free-pdf-viewer Start here, not a random exe host

Related hardware

A small reader. Huge scanned PDFs want RAM. A GPU is optional.

Technical details

Vendor version numbers change. This article does not pin a build.

Sources and verification

Reviewed by Feex editorial. Last verified August 2026 Status: Feex Reviewed. How we research.

Sumatra PDF official site · Vendor product page
Sumatra PDF help · Vendor support
Foxhole process map · First-party samples on Windows PCs. Not a lab benchmark.

Was this article useful?

A yes or no is enough. Pick a reason if you want, or add a short note.