SecureCompiler - Online C Compiler
Write, compile and execute C programs directly in your browser with our free online C compiler. Whether you are a student learning C programming or a developer testing a quick snippet, you can get started in seconds — no downloads, no installations, no account required.
How to Use This Online C Compiler
Simply type or paste your C code into the editor above and click the Run button. Your program is compiled and executed entirely inside your browser using WebAssembly. Standard input is fully supported — when your program calls scanf(), the terminal will prompt you to type input just like a real terminal. You can also format your code with the Format button and share it with others using the Share button.
What C Features Are Supported?
This online C compiler supports standard C features including stdio.h (printf, scanf, puts, getchar), arrays, pointers, structs, functions, loops, conditionals, string.h, math.h, stdlib.h, and more. It is ideal for practicing C programming exercises, testing algorithms, and learning the fundamentals of the C language.
Why Use a Browser-Based C Compiler?
Traditional C development requires installing a compiler like GCC or Clang on your machine. Our online C compiler eliminates that setup entirely. Your code runs securely in a sandboxed WebAssembly environment — nothing is sent to any server, so your code stays completely private. It works on any device with a modern browser, including phones and tablets.
Perfect for Students and Beginners
If you are taking a C programming course or working through textbook exercises, this compiler lets you practice anywhere. Write your code, test it with different inputs, and see the output immediately. The built-in terminal supports interactive programs with user input, making it easy to test real-world C programs.