Android - Is there a minimal installation of ADB?

I do not really understand why anyone would prefer downloading an old version of unknown origin from a malware-ridden website to downloading the latest official version directly from Google itself. I guess to each its own.

Here are the links to the Google repository:

The latest version of the platform tools (contains just a few binaries - less than 10Mb in size each):

• Windows
• Linux
• Mac

For users of Ubuntu and Debian (distributions I personally use) I have put together a small bash script which finds and installs the latest version of the platform tools - Installing Android platform tools (ADB) on Ubuntu

In fact, it is not necessary to install the entire SDK if one does not want to use it for development. To be able to run basic ADB commands in the context needed by an average user, a rudimentary installation is completely sufficient. I will try to explain how to do this, and hopefully cover the most used computer systems.

Requirements

First, you will need the basic binaries. These can be found e.g. in the Download area of my Android site, where I try to keep up-to-date versions available – for Linux, MacOS, and Windows.¹

Windows users

If your computer is running Windows, you will also need the special drivers for your device (no generic solution here, so you need to check this out yourself; usually, those drivers are offered for download on the manufacturer's website).

Linux and Mac OS users

Linux and Mac OS users might need to make their device known to their operating system. For Linux, you find the necessary steps described in my answers here and here. Not being familiar with Mac OS, I can not speak for it.

Installation

Linux

For Linux, this is quite easy: Simply unpack the downloaded binaries into a directory of your choice. At the time I'm writing this, this will only be two files: adb and aapt (the latter being used by QtADB, and not necessarily needed to execute ADB commands directly). Adjust their file permissions to make them executable (e.g. from the command line: chmod 0755 adb aapt). Finally, it's a good idea to include the chosen directory with your $PATH variable, so you can call adb from wherever you are. A good place for that is at the end of your ~/.profile file to include an additional line like export PATH="~/bin:$PATH" (if you extracted the binaries to ~/bin).

Windows

The Windows download holds a couple more files. Also extract them into a directory of your choice. If you want them to be callable from wherever you are, without preceding the complete path, you need to add that path to your environment variables as well. Not being a Windows user, I must leave the "how to do this" to you.

What else?

You should be done at this point, and can use the full powers of the ADB command line.

Alternatives?

• on some Linux distros, you can install the packages android-tools-adb and android-tools-fastboot via the resp. package manager. This has the pro of being updated automatically.
• on OS X, you can use SimMac's installer
• Update 1/2017: Google now offers direct links for the "always latest" platform tools, which include a.o. adb and fastboot:
  • platform tools for Linux
  • platform tools for Mac
  • platform tools for Windows

Further readings

• Everything about ADB (A reference for everyone at XDA Developers)
• ADB for Dummies (again available via XDA Developers. If you miss the guides as I did firstly: The first article is consisting of links only, colorful as they might look :))
• Android ADB Quick Guide
• our adb tag-wiki

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^{1: Also see Alex' answer for more alternative sources. My sources are the official Google downloads, just "stripped down".}

I made something for OS X, this may be exactly what you are looking for: Quick ADB/Fastboot installer: ADB and Fastboot binaries with installer