PlantUML Preview Tool
PlantUML Code
Enter valid PlantUML text
Diagram Preview
FAQ
What can this PlantUML preview tool do?
This tool allows you to write PlantUML code in the left editor and instantly preview the rendered diagram on the right. It supports zooming, panning, fullscreen mode, and opening the diagram in a new tab for standalone viewing.
Can I zoom in/out and pan the diagram?
Yes. Use the mouse wheel to zoom in and out. Click and drag the diagram to pan around. You can also use the '+' and '-' buttons to zoom, and the 'Reset' button to restore the default view.
How do I open the diagram in a new tab?
Click the 'Open in new tab' button in the toolbar. This will open the SVG image directly in a new browser tab, allowing you to view or save it separately.
What is fullscreen mode for?
Fullscreen mode expands the preview area to fill the entire browser window, giving you a larger view of the diagram. You can enter fullscreen by clicking the 'Fullscreen' button and exit by pressing the 'Esc' key or clicking the 'Exit fullscreen' button.
Can I copy the PlantUML code?
Yes. Click the 'Copy code' button to copy the current editor content to your clipboard. The tool will show a notification when copied successfully.
What happens if I clear the code?
The 'Clear' button will erase the editor content. The preview will show a placeholder message until you enter new code.
Is there a limit on the diagram size or complexity?
The tool relies on the public PlantUML server, which may have size limits. Very large or complex diagrams might take longer to render or fail. For heavy usage, consider using a local PlantUML installation.
Is my data kept private?
Your PlantUML code is sent to the public PlantUML server (plantuml.com) for rendering the SVG diagram. The tool does not store, log, or share your code. However, because the code is transmitted over the internet, we recommend using a local PlantUML server for highly sensitive diagrams. All other operations (zooming, panning, fullscreen) happen entirely in your browser.