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DiagramPreview
Paste Mermaid/PlantUML/OpenAPI/SQL and export diagrams
Preview and convert Mermaid, PlantUML, Markdown, Graphviz, D2, draw.io, mind maps, JSON, YAML and developer diagrams online.
Hey Product Hunt 👋
I built DiagramPreview because I kept running into the same problem: AI tools can generate Mermaid, PlantUML, draw.io XML, Grafana dashboards, Prometheus rules, JSON Schema, and many other technical snippets, but they usually do not give you a good way to preview, debug, edit, or export the result.
DiagramPreview started as a simple Mermaid preview tool, then gradually became a browser-based workspace for developers, technical writers, architects, and product teams who work with visual scripts and structured files.
Today it supports 70+ tools, including:
- Mermaid, PlantUML, Graphviz, D2, draw.io, Markdown previews
- AI diagram generation and fixing
- JSON/YAML/XML/CSV visualizers
- OpenAPI, SQL, Prisma, DBML, GraphQL, Protobuf diagram tools
- Docker, Kubernetes, Terraform, GitHub Actions, Nginx, Helm visualizers
- Grafana dashboard and Prometheus alert rule generators
- SEO/debug tools like robots.txt tester, sitemap viewer, Open Graph preview debugger
The main idea is simple: paste text or generated output, preview it instantly, debug it visually, then export or continue editing.
I would love feedback from developers, DevOps engineers, technical writers, and anyone who often works with diagrams-as-code or AI-generated technical docs.
What tool or format should I add next?
About DiagramPreview on Product Hunt
“Paste Mermaid/PlantUML/OpenAPI/SQL and export diagrams”
DiagramPreview was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #65 on the daily leaderboard. Preview and convert Mermaid, PlantUML, Markdown, Graphviz, D2, draw.io, mind maps, JSON, YAML and developer diagrams online.
On the analytics side, DiagramPreview competes within Design Tools, Open Source, Developer Tools and GitHub — topics that collectively have 885.1k followers on Product Hunt. The dashboard above tracks how DiagramPreview performed against the three products that launched closest to it on the same day.
Who hunted DiagramPreview?
DiagramPreview was hunted by peng li. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of DiagramPreview including community comment highlights and product details, visit the product overview.
peng li