Free online compilers
Write code, press Run and see the output in a few seconds. Every compiler here is free and works without an account — on a laptop or on a phone.
- PythonRuns on our serverWrite Python 3, press Run, and see the result. Nothing to install.Open the Python compiler
- CRuns on our serverWrite C code, press Run, and see the output in a few seconds. No sign-up, no install.Open the C compiler
- C++Runs on our serverRun C++ programs with the full STL. Good for DSA practice and coding rounds.Open the C++ compiler
- JavaRuns on our serverRun Java without installing the JDK. Type, press Run, see the output.Open the Java compiler
- JavaScriptRuns in your browserYour code runs inside your own browser. It is instant, and the code never leaves your device.Open the JavaScript compiler
- HTML, CSS & JSRuns in your browserThree tabs — HTML, CSS and JS — and a live preview of your page.Open the HTML, CSS & JS compiler
- SQLSQLite · runs in your browserCreate tables, add data and run queries. The results appear as tables.Open the SQL compiler
- TypeScriptRuns on our serverCheck your types and run the code in one step. No tsconfig, no setup.Open the TypeScript compiler
- ReactRuns in your browserWrite a React component, press Run, and see it live. No npm install, no setup.Open the React compiler
- BashRuns on our serverWrite a shell script, press Run, and see the output. No Linux machine needed.Open the Bash compiler
How these compilers work
Python, C, C++, Java, TypeScript and Bash run on our server in a safe sandbox with no internet access. Each run can take a few seconds, and you can type input for your program in the Input box.
JavaScript, HTML/CSS, React and SQL run inside your own browser, so they start at once and your code never leaves your device.
Want more than a quick test? A free DevHives account gives higher limits, DSA problems with a judge and step-by-step lessons.