Online Code Editor
Write and preview code with syntax highlighting for 20+ languages.
About This Tool
Code Editor is a free online syntax highlighting editor for writing, viewing, and copying code in over 20 programming languages. Select your language, write or paste code, and see instant color-coded syntax highlighting. Adjust the font size for comfortable reading or screen sharing, then copy the whole snippet with one click.
The editor uses highlight.js for syntax highlighting, supporting JavaScript, TypeScript, Python, HTML, CSS, JSON, SQL, Go, Rust, Java, C++, PHP, Ruby, Swift, Kotlin, and more. It is a lightweight tool focused on readability and quick code sharing rather than full IDE functionality. No code is executed and nothing is sent to any server.
Code Editor is most useful for preparing code snippets for documentation, README files, blog posts, or technical presentations; reviewing code from external sources with syntax highlighting; and formatting quick scripts or configuration examples for sharing with colleagues.
How to Use
- 1
Select the programming language from the dropdown.
- 2
Write or paste your code into the editor — syntax highlighting applies automatically.
- 3
Adjust font size as needed and copy the code with the copy button.
- 4
Use the editor to prepare code snippets for documentation, blog posts, or presentations.
- 5
Copy the formatted, highlighted code and paste it into your project or document.
Features
20+ Languages
Syntax highlighting for JavaScript, TypeScript, Python, HTML, CSS, JSON, SQL, Go, Rust, and many more.
Syntax Highlighting
Color-coded syntax makes code easier to read and review at a glance.
Adjustable Font Size
Change the editor font size for comfortable reading and screen sharing.
One-Click Copy
Copy your entire code snippet to the clipboard with a single button click.
Common use cases
- ›Write and format code snippets for technical blog posts, tutorials, or documentation.
- ›View and highlight-format code received from colleagues or external sources before using it.
- ›Prepare code examples for presentations, slide decks, or screen-share sessions.
- ›Format configuration file snippets (JSON, YAML, TOML) with syntax highlighting for review.
FAQ
What languages are supported?
JavaScript, TypeScript, Python, HTML, CSS, JSON, SQL, Java, C++, Go, Rust, PHP, Ruby, Swift, Kotlin, and more.
Can I run the code?
This is a code editor with syntax highlighting preview. For execution, use a dedicated runtime environment.
Does it support auto-indentation or bracket matching?
The editor is a lightweight syntax highlighting tool optimized for readability and copying. It does not include IDE features like auto-complete, bracket matching, or code execution.
Is there a character limit?
There is no hard limit. The editor works well for snippets and short to medium code files. For very large files (10,000+ lines), a desktop IDE will provide a better experience.
Can I share code snippets with others?
The editor doesn't have built-in sharing. Copy the code and paste it into a platform like GitHub Gist, Pastebin, or your team's collaboration tool for sharing.