Download Java (Eclipse Temurin JDK 21)
Official file from github.com/adoptium — not modified or re-hosted by us.
Official file from github.com/adoptium — not modified or re-hosted by us.
All downloads
Java (Eclipse Temurin JDK 21) 21.0.12.101 files
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Download
64-bit MSI installer .msi Recommended
Links checked October 29, 2026. Each link points to the developer’s own download server. Prefer the developer’s page? Official download page
About Java (Eclipse Temurin JDK 21)
This page offers Java through Eclipse Temurin, a free, open-source build of OpenJDK from the Eclipse Adoptium project, backed by companies including Microsoft, Red Hat and IBM. Version 21 is a Long-Term Support (LTS) release, widely used for development and for running Java applications.
The JDK (Java Development Kit) includes everything needed to compile and run Java programs. Temurin is free for any use, including commercial, and is a common alternative to Oracle’s Java builds.
Best for: Developers and users who need a free, trustworthy Java installation.
System requirements
- Windows: 64-bit (x64)
- macOS: Apple Silicon, Intel
Features
What you can do with Java (Eclipse Temurin JDK 21)
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Full JDK
Compiler, runtime and tools such as javac and jshell.
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LTS release
Java 21 receives long-term updates.
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Free for business
No licence fees for commercial use.
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Tested builds
Builds pass the official Java compatibility tests (TCK).
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Easy installers
Windows MSI and macOS PKG can set JAVA_HOME and PATH.
Safety
Where these links come from
Versions and download addresses are read automatically from winget (Windows) and Homebrew (macOS), the public package catalogues used by millions of developers. We only show a link when it points to the developer’s own official domain, and we never host, repackage or bundle the files — your browser downloads them directly from the developer.
Check the file after downloading (optional)
Compare the SHA-256 checksum shown above with the one of the file you downloaded. If they match, the file is exactly the one published by the developer.
- Windows: open PowerShell in your Downloads folder and run
Get-FileHash .\filename - Mac: open Terminal and run
shasum -a 256 ~/Downloads/filename
Help
Java (Eclipse Temurin JDK 21): frequently asked questions
Is this the official Java (Eclipse Temurin JDK 21) download?
Yes. The download buttons link directly to the developer’s own servers (github.com/adoptium). DownloadFrom.net does not host, modify or bundle Java (Eclipse Temurin JDK 21); we only list the official files and their SHA-256 checksums so you can verify them.
Which Windows file should I download?
There is one Windows download: the 64-bit MSI installer (.msi).
Apple Silicon or Intel — which Mac file do I need?
Open the Apple menu → About This Mac. If it shows “Chip: Apple M…”, download the Apple Silicon version; if it shows “Processor: … Intel”, download the Intel version.
Is this the same as Oracle Java?
Temurin is built from the same OpenJDK source code that Oracle’s JDK is based on, but it is provided by Eclipse Adoptium under an open-source licence.
Do I need the JDK or just a JRE?
To run most modern Java applications or develop software, the JDK is the simplest choice — it includes the runtime.
Is Temurin free for commercial use?
Yes. Eclipse Temurin is free for any use (GPL-2.0 with Classpath Exception).
Alternatives
Alternatives to Java (Eclipse Temurin JDK 21)
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Android Studio
Building and testing Android apps.
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Visual Studio Code
Developers of all levels who want one free editor for almost any language.
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Python
Learning to program, scripting, data analysis and machine-learning projects.
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Git
Anyone writing code, or collaborating on files with a history of changes.
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Node.js (LTS)
Web developers and anyone who needs npm-based tools.
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Docker Desktop
Developers who build or run containerised apps on their own computer.