NSIS

Free plan LinuxMacWindows

What NSIS is

NSIS is a free tool for programmers creating Windows installers and uninstallers. Its installer-focused scripting language supports variables, functions, string manipulation, and custom installation logic. Generated installers can install or remove software, change system settings, and extract files. Developers can choose classic or modern wizard interfaces, build custom pages, and include multiple interface languages, including right-to-left languages. Compression options include ZLib, BZip2, and LZMA. Plug-ins can extend installer tasks and interfaces; included plug-ins can download files, make internet connections, and patch existing files. The compiler preprocessor can combine projects, automate builds, and produce variants such as lite and full releases. Installers can check themselves with a CRC32 checksum. Command-line packaging and silent installation are supported. The compiler can be built for POSIX platforms such as Linux and BSD, but generated installers run on Windows. The free plan costs nothing and allows installers up to 2GB. The manual links to a FAQ, wiki, and forum.

Who it suits

NSIS suits programmers who need to build customizable Windows installers and uninstallers. Its scripting, plug-ins, and build options are useful for projects requiring custom installation logic or multiple release variants.

What it does well

Free for any use, with installers up to 2GB.
Supports command-line packaging and silent installation.
Offers ZLib, BZip2, and LZMA compression.
Supports multiple interface languages, including right-to-left.
Can automate builds and create installer variants.

What to know first

Generated installers run on Windows.
The compiler can be built for POSIX systems, not installer output.
Some components have separate licenses or exceptions.

Limits

The free plan permits installers up to 2GB. Installers generated by NSIS run on Windows.

Plans

Plan	Billed and limits	Price
NSIS	Completely free for any use · installers can be as large as 2GB · generated installers run on Windows	Free

As nsis.sourceforge.io lists them, read 4 Oct 2026. The maker's own page has the final word.

Getting started

Visit the NSIS website.
Build or obtain the compiler for a supported platform, such as Linux or BSD.
Write installer scripts using the NSIS scripting language.
Package the installer from the command line or use the compiler preprocessor to automate builds.

Verdict

NSIS provides scripting and packaging tools for building Windows installers with custom interfaces and installation logic. Its compiler can be built on POSIX systems, but the resulting installers are for Windows.

Questions

How much does NSIS cost?

The listed plan is free, and NSIS is free for any use.

What operating systems does NSIS support?

The compiler can be built for POSIX platforms such as Linux and BSD. Installers it generates run on Windows.

What kinds of packages can NSIS create?

It creates self-contained executable installers (.exe) and uninstallers for Windows.

Can NSIS installers run silently?

Yes. Silent installation is supported, as is command-line packaging.

Can installers use multiple languages or custom interfaces?

Yes. A single installer can support multiple interface languages, including right-to-left languages. Developers can also create language files, custom pages, and custom interfaces.

What license does NSIS use?

The source code, plug-ins, documentation, examples, header files, and graphics are generally under the zlib/libpng license. Compression modules have separate stated licenses, and the license page notes exceptions.

Facts from NSIS's own pages

Builds: The compiler preprocessor can combine multiple projects into one installer, generate builds automatically, and create variants such as lite and full releases. · nsis.sourceforge.io, 4 Oct 2026
Compression: NSIS includes ZLib, BZip2, and LZMA compression methods. · nsis.sourceforge.io, 4 Oct 2026
Extensions: NSIS supports plug-ins that can extend installer tasks and interfaces; plug-ins can be written in C, C++, Delphi, or another language. · nsis.sourceforge.io, 4 Oct 2026
Installer interfaces: It includes classic and modern wizard interfaces and lets developers create custom pages and interfaces. · nsis.sourceforge.io, 4 Oct 2026
Integrity check: The feature list says installers can verify themselves using a CRC32 checksum. · nsis.sourceforge.io, 4 Oct 2026
Languages: A single installer can support multiple interface languages, including right-to-left languages, and developers can create their own language files. · nsis.sourceforge.io, 4 Oct 2026
License: The source code, plug-ins, documentation, examples, header files, and graphics are generally under the zlib/libpng license, with separate stated licenses for compression modules and exceptions noted on the license page. · nsis.sourceforge.io, 4 Oct 2026
Platform support: The compiler can be built for POSIX platforms such as Linux and BSD, while installers it generates run on Windows. · nsis.sourceforge.io, 4 Oct 2026
Purpose: NSIS is a tool for programmers to create Windows installers, including installers that can install, uninstall, change system settings, and extract files. · nsis.sourceforge.io, 4 Oct 2026
Scripting: Its installer-focused scripting language supports variables, functions, string manipulation, and custom installation logic. · nsis.sourceforge.io, 4 Oct 2026
Support resources: The users manual links to a FAQ, wiki, and forum for questions and discussion. · nsis.sourceforge.io, 4 Oct 2026
Web and patching: Included plug-ins can download files from the internet, make internet connections, and patch existing files. · nsis.sourceforge.io, 4 Oct 2026

Where NSIS stands on Freedom251

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