Open TOML Files Online
TOML is a configuration format with sections in square brackets and simple key = value pairs. Rust's Cargo.toml and Python's pyproject.toml are the best-known examples.
Tom's Obvious Minimal Language · .toml
What you see in the TOML viewer
- Syntax errors with the exact line
- Tables and arrays as a tree
- Copy the configuration as JSON
- Highlighting for keys, strings and dates
Other ways to open TOML files
Windows
Any text editor opens TOML; VS Code highlights it with an extension.
macOS
TextEdit or VS Code show it as text.
Phone & tablet
Use the browser for a highlighted, validated view.
Frequently asked questions
Is my TOML file uploaded?
No. The file is read by your browser and shown on your own device. Nothing is sent to a server, and it is gone when you close the tab.
How do I open a TOML file without installing software?
Drop the .toml file on this page. It opens straight away in the TOML Viewer & Validator, on Windows, macOS, Linux, Android and iPhone alike.
What if my TOML file doesn't open?
The viewer checks the file's content, not just its name. If it is damaged or not really a TOML file, you'll see an error or can switch to the hex view to look at the raw bytes.
Can I convert TOML to another format?
Yes. The free file converter turns TOML files into other formats in your browser as well, without uploading them.