Disclosure: I work on diagram.now, so this is a self-submission rather than someone else hunting it. It is a diagram editor that opens straight in the browser. No account, nothing to install, and imported files are parsed client-side rather than uploaded to a server. What is actually shipping today: - Import: Gliffy (.gliffy), Lucid, Visio .vsdx, SQL DDL to ERD, CSV, Mermaid, draw.io XML - Export: PNG, SVG, PDF, JPEG, WebP, XML, JSON, or a share URL; plus publish, embed, print - Shape libraries for flowcharts, tables, connectors, Azure architecture icons, GitHub Octicons, Lucide, Bootstrap Icons and Simple Icons - Optional Confluence app if you want the same editor inside a wiki page. The browser editor works fully without it. Limits worth knowing before you try it: - Mermaid import covers flowchart/graph syntax, not the whole Mermaid language - Collaboration is local-only today; there is no live multi-user editing - VSDX import reads the pages and shapes, not every Visio feature Happy to answer questions about import fidelity - that is usually the part people want to stress-test. If something fails to import, tell me what tool it came out of and I will look at it.

diagram.now

Free browser diagram editor that imports Gliffy and Lucid

Free browser diagram editor that imports Gliffy and Lucid