Code Previewer EN

View local source code files beautifully — right in your browser.

Code Previewer replaces the browser's plain-text view of local files (file:// URLs) with a VS Code-like viewer featuring syntax highlighting, line numbers, and code folding.

FEATURES
• Syntax highlighting for 25+ file types: Python, JavaScript, JSON, YAML, HTML, CSS, Java, Go, Rust, C/C++, SQL, XML, Markdown, Shell, Dockerfile, and more
• Folder view: open any local folder and browse it as a clean grid of files and sub-folders — with language badges, filter, sort and keyboard navigation
• Compare mode: side-by-side diff of two files with change highlighting
• Markdown preview: split view, preview-only or source-only, with syntax-highlighted code blocks
• Mermaid diagrams: .mmd / .mermaid files and mermaid blocks inside Markdown render as real diagrams
• 4 themes: Light, One Dark, GitHub Light, Dracula
• Search within file (Ctrl+F), word wrap (Alt+Z), code folding
• Copy, download, reload and back buttons; full-screen mode
• Fully offline — your files never leave your computer

IMPORTANT — ONE-TIME SETUP
After installing, open the extension's Details page and enable "Allow access to file URLs". The extension does nothing without it.

PRIVACY
No data is collected or transmitted. The only stored setting is your theme preference.