Sumatra PDF 2.3.2

Sumatra PDF is a free PDF, eBook (MOBI), XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows. Sumatra PDF is small and starts up very fast. Simplicity of the user interface has a high priority. Portable version included (a single executable that can be run e.g. from USB drive and doesn't write to registry).

What's new in version 2.3.2:

  • fix changing a language via Settings/Change Language

Download: Sumatra PDF 2.3.2 Installer | 3.9 MB (Freeware)
Download: Sumatra PDF 2.3.2 Portable | 2.5 MB
Download: Sumatra PDF 64-bit | 4.2 MB
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I think it will be faster now, though, won't it? Since SSE2 is no longer supported, SSE3 and later instructions can be used.

The 64-bit build seems to be an unofficial one from a third-party.


Aryeh Goretsky

SSE2 is a supplementary instruction set (like SSE3 or SSE4.2 for example). By removing the use of SSE2 instructions they're allowing machines which don't have those instructions to use SumatraPDF.

They enabled officially up to SSE2 in 2.3 but probably due to reports of people who could not use SumatraPDF anymore they reverted back to only use IA-32 instructions (the basis).

The basic instruction set in AMD64 (most 64-bit CPUs belong follow this architecture) is up to SSE2. Which means that those microprocessors support up to SSE2 by default (plus all other extensions SSE3, SSSE3, SSE4.1, ...), so a 64-bit build of an application would benefit from them, if they can be used for that particular application, using the minimum common instruction set available.

In SumatraPDF there are no official 64-bit builds (see [1] for the reasons), one of the reasons I use a 64-bit build of SumatraPDF is because it gets me the 64-bit version of the browser plugin I need for the 64-bit Palemoon (a web browser).

Hope that helps .


Actually the decision to use SSE2 was derived from the large number of people that already have SSE3+ but I guess there are still some people using older machines, SSE2 was fully established by... 2003 or 2004.

Anyway, if you want to I just finished building 2.3.2 using up to SSE2: