About

DiagramPreview helps people turn text, structured data, and diagram files into visual previews that are easier to inspect, share, and export. The core audience is developers and technical teams who need to check diagrams before they land in documentation, tickets, pull requests, architecture notes, or incident reports.

The workspace supports Mermaid, PlantUML, Markdown, Graphviz, D2, draw.io XML, mind maps, JSON, YAML, OpenAPI, SQL, Kubernetes, Docker Compose, GitHub Actions, and other developer-oriented formats. Each tool keeps the source visible next to the preview so the result can be reviewed instead of treated as a black box.

The site is maintained as a practical browser-first toolbox. Most renderers run locally in the browser where possible, while AI-assisted generators use a server-side API so provider keys are never exposed to visitors.

New tools are added when they solve a repeatable documentation or debugging workflow. Existing tools are checked for rendering errors, export behavior, sample quality, mobile layout, metadata, and whether the page explains limitations clearly enough for a first-time visitor.

For support, bug reports, partnership questions, or content corrections, contact zplviewercontact@gmail.com. Include the page URL, browser, input format, and a short reproduction example when the issue is related to preview or export behavior.

Last updated: June 18, 2026.