Online Crystal Compiler
Write Crystal in the browser and run it on our machines. The editor is opening.
Free online Crystal compiler and editor
JDoodle is an online IDE that has served the programming community since 2013. You write, compile, and run code in the browser for Crystal and many other languages, without installing a toolchain.
What you see on this page is JDoodle’s free Crystal compiler. Write Crystal in the editor, press Execute, and JDoodle runs it on its servers. You do not install Crystal, and you do not need a JDoodle account to run code.
Online Crystal editor
JDoodle’s Crystal editor on this page highlights syntax, completes as you type, matches brackets, and folds blocks. It is an online Crystal editor and a compiler together: you write here, then Execute runs your program on JDoodle’s servers.
Crystal versions on JDoodle
JDoodle currently ships these Crystal builds. Choose one from the version menu before you execute. The installed releases are 1.10.1, and 1.19.1.
| Version |
|---|
| 1.10.1 |
| 1.19.1 |
Frequently asked questions
Is JDoodle’s online Crystal compiler free?
Yes. JDoodle lets you write and run Crystal without paying. A JDoodle account is only needed to save projects, use more AI credits, or unlock faster workspaces.
Do I need to install Crystal to use JDoodle?
No. JDoodle runs Crystal on its servers. Open this page in a browser and execute.
Which Crystal version should I pick on JDoodle?
Choose the version that matches the course or codebase you are working against from the version menu. The builds JDoodle has installed are 1.10.1, and 1.19.1.
Can I run a multi-file Crystal project online?
Not on this page, which runs a single Crystal file. For several files in one project, open the JDoodle Crystal IDE. Everything else works the same on both.
Is this an online Crystal editor or a compiler?
Both. The page is an online Crystal editor and it compiles and runs what you write.
Input, interactive runs, files, and the rest of the editor work the same on every language. See the JDoodle IDE documentation.