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Code Viewer

Open a source file or paste a snippet to read it with proper syntax highlighting and line numbers. Auto-detects the language across HTML, CSS, JavaScript, TypeScript, JSON, Python, Java, C/C++, Go, Rust and many more — privately in your browser.

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What is the Code Viewer?

The Code Viewer is a free online tool for reading source code the way it's meant to be read — with colour-coded syntax highlighting and line numbers. Upload a file or paste a snippet and the viewer automatically detects the language and styles keywords, strings, comments, numbers and tags so the structure jumps out at a glance. It's the fastest way to inspect a file someone sent you, review a snippet from the web, or share a clean, readable view of your code — all without an IDE.

Automatic Language Detection

Drop in almost any source file and the Code Viewer recognises the language from its extension, or detects it automatically from the content when you paste. It supports dozens of languages including HTML, XML, CSS, SCSS, JavaScript, TypeScript, JSON, Python, Java, C, C++, C#, Go, Rust, PHP, Ruby, SQL, Bash, YAML and Markdown. You can also override the detected language manually at any time.

Line Numbers & Word Wrap

Line numbers make it easy to reference a specific spot when reviewing or discussing code, and they can be toggled off for a cleaner copy. Long lines can be wrapped to fit the screen or left intact with horizontal scrolling, whichever suits how you like to read. The viewer handles large files smoothly so you can browse real-world source comfortably.

Copy, Download & Fullscreen

Copy the raw code back to your clipboard with one click, download it as a text file, or expand to fullscreen for an immersive reading experience on big files. The Code Viewer is built for quick inspection and sharing rather than editing, so it stays fast and focused.

Privacy: Nothing Is Uploaded

All highlighting happens locally in your browser. Your code is never uploaded to a server, stored or logged, which makes the Code Viewer safe for proprietary source, internal scripts and confidential snippets. When you close the tab, the content is gone.

Free Online Code Viewer & Syntax Highlighter | ToolSnak

Got Questions? We have you covered

Dozens, including HTML/XML, CSS, SCSS, JavaScript, TypeScript, JSON, Python, Java, C, C++, C#, Go, Rust, PHP, Ruby, SQL, Bash, YAML and Markdown. It auto-detects the language, and you can also choose one manually.

No. Syntax highlighting runs entirely in your browser. Your code is never uploaded, stored or logged, so it's safe for private and proprietary files.

The Code Viewer is designed for reading, not editing — it focuses on fast, clean syntax highlighting. If you want a live editor with output, use the HTML Compiler instead.

Yes. You can copy the raw code to your clipboard or download it as a text file directly from the toolbar.

You can view files up to 5 MB. The viewer is optimised to highlight large files quickly while staying responsive in your browser.