Which languages are supported?

100+ languages including JavaScript, TypeScript, Python, Go, Rust, Java, C/C++, PHP, CSS, YAML, and more. HTML and Markdown files open in their own dedicated rendered viewers instead of here.

Can I edit the code here?

This is a read-only viewer. For editing, open the file in your usual editor.

Is my source code uploaded?

No — highlighting runs fully client-side via a WebAssembly build of Shiki.

Does it detect the language automatically?

Yes, based on the file extension, with a manual override if detection is wrong.

Can I view minified or very long files?

Yes, though extremely long single lines may scroll horizontally rather than wrap.

Code Viewer

File Viewers

View source code files with automatic language detection and syntax highlighting. No upload, works with 100+ languages.

Drop a file here, or click to choose

Accepts .js, .ts, .tsx, .jsx, .py, .rb, .go, .rs, .java, .c, .cpp, .cs, .php, .css, .yml, .yaml, .sh, .sql

Rendered with Shiki. Nothing about this file is ever sent to a server — open your browser's Network tab while using this viewer and you'll see no request carrying your file's contents.

What you can do with this tool

Automatic language detection from file extension
Line numbers and line-highlighting on click
Light/dark theme matching the site theme
Copy full file or selected lines
Handles large files without freezing the page

Frequently asked questions

Which languages are supported?: 100+ languages including JavaScript, TypeScript, Python, Go, Rust, Java, C/C++, PHP, CSS, YAML, and more. HTML and Markdown files open in their own dedicated rendered viewers instead of here.
Can I edit the code here?: This is a read-only viewer. For editing, open the file in your usual editor.
Is my source code uploaded?: No — highlighting runs fully client-side via a WebAssembly build of Shiki.
Does it detect the language automatically?: Yes, based on the file extension, with a manual override if detection is wrong.
Can I view minified or very long files?: Yes, though extremely long single lines may scroll horizontally rather than wrap.

What would you like to do next?

JSON Viewer

View and explore JSON files as an interactive collapsible tree or formatted raw text. No upload, no account.

XML Viewer

View and explore XML files as a collapsible tree or raw text. No upload, no account.

Text Viewer

View plain text (.txt) files online with line numbers and easy copying. No upload, no account.

Markdown Viewer

View and render Markdown (.md) files as formatted HTML, with a raw source view. No upload, no account.