ER diagram tool
An ER diagram makes a data model visible before it becomes tables and columns. AnnexShow gives you an ER diagram tool in the browser, so you can place entities, list attributes and draw the relationships between them with drag and drop. Start from a template or a blank canvas, then tune colors, fonts and shapes so the model stays readable for the whole team. Vector output keeps every connector crisp in documentation or on a slide. Share a public link for review, invite teammates to refine the schema, and export to PNG, JPG, SVG or PDF when the model is ready to hand off.
How it works
- Open an ER template or start from a blank canvas.
- Add entities and list their attributes.
- Draw relationships and apply clear styling.
- Share a link for review and export to PNG, SVG or PDF.
Frequently asked questions
- Can I make an ER diagram for free?
- Yes. The free plan includes core editing and a limited number of projects, with no credit card required to start. Pro is €5.90/month or €59/year.
- What can I model in the diagram?
- Add entities, attributes and relationships, and arrange shapes with drag and drop on the canvas.
- Can I export the diagram for docs?
- Export to PNG, JPG, SVG and PDF. Pro adds PPTX, GIF and MP4 plus more storage and premium templates.