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Open a tool, paste source content, choose an example when useful, and review the preview pane for output or syntax errors. Most tools keep the input editable, so you can reduce a failing example, fix syntax, and re-render without leaving the page.

Supported renderers expose copy, SVG, PNG, PDF, or source-file download actions when the underlying format can provide them reliably. If an export button is disabled, the current renderer usually cannot provide that artifact for the selected input.

If a diagram does not render, reduce the source to a smaller example, check the syntax for the format, and then add sections back gradually. For Mermaid and PlantUML, start with the diagram header and two nodes or participants before restoring the full diagram.

For file-like formats such as OpenAPI, Kubernetes, Docker Compose, JSON Schema, or SQL, confirm that the pasted content is complete and valid before debugging the visualization. A missing quote, YAML indentation error, or partial schema can stop the preview before the diagram layer runs.

When reporting a problem, send the tool URL, the input format, whether the issue affects preview or export, and a minimal sample that reproduces the behavior. Avoid sending private credentials, production secrets, or customer data.

Support email: zplviewercontact@gmail.com.