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Diagramming Tool
What Diagramming Tool is
Diagramming Tool is a free browser-based app for creating technical, business, planning, and data diagrams. Its supported formats include cloud architecture, flowcharts, sequence diagrams, entity relationship diagrams, UML class diagrams, C4 container diagrams, Kubernetes topologies, and network diagrams. It also handles state machines, Gantt charts, Kanban boards, mindmaps, org charts, sitemaps, Sankey flows, XY charts, radar charts, treemaps, and fishbone diagrams. Users can place items on a free-form canvas or edit auto-layout diagrams directly on the picture. The site offers 37 templates, and its icon picker includes providers and tools such as AWS, Azure, Google Cloud, Kubernetes, Docker, Terraform, Postgres, Redis, and Kafka. Exports include PNG at 1× to 4× and SVG, with no watermark or export limit. Work can also be saved as a .diagram.json file. Diagrams are created, rendered, and stored in the browser; share links carry diagram data in the URL fragment. The Free plan costs nothing, requires no account, and is unlimited.
Who it suits
It may suit people who want to make varied diagrams in a browser without creating an account. Phone touch gestures are supported for editing on mobile devices.
What it does well
- Supports many technical and business diagram types.
- Includes 37 starting templates.
- PNG and SVG exports have no watermark or limit.
- No account is required.
- Supports phone touch gestures.
What to know first
- PNG and SVG exports cannot be reopened for editing.
- Editable work requires saving the .diagram.json file.
- The site uses Google Analytics and Google AdSense after consent.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free | Free and unlimited · no account · no paid tier | Free |
As diagrammingtool.com lists them, read 11 Oct 2026. The maker's own page has the final word.
Verdict
Diagramming Tool offers broad diagram coverage with free, unlimited use and several export options. Save the .diagram.json version if you need to reopen and edit your work.
Facts from Diagramming Tool's own pages
- Device support
- The maker says the editors support phone touch gestures including pinch-to-zoom, panning and tapping to edit. · diagrammingtool.com, 11 Oct 2026
- Diagram types
- cloud architecture,flowcharts,sequence diagrams,entity relationship diagrams,UML class diagrams,C4 container diagrams,Kubernetes topologies,network diagrams,state machines,Gantt charts,Kanban boards,mindmaps,org charts,sitemaps,Sankey flows,XY charts,radar charts,treemaps,fishbone diagrams · diagrammingtool.com, 20 Sept 2026
- Editors
- It offers a free-form canvas for manual placement and auto-layout diagrams edited directly on the picture. · diagrammingtool.com, 11 Oct 2026
- Export integrations
- The maker says exported SVGs open as editable shapes in Figma, Illustrator and Inkscape. · diagrammingtool.com, 11 Oct 2026
- Exports
- Diagrams export as PNG at 1× to 4× or as SVG, with transparent, white or canvas-matching backgrounds; exports have no watermark or limit. · diagrammingtool.com, 11 Oct 2026
- Free plan
- Yes · diagrammingtool.com, 20 Sept 2026
- Import/export formats
- PNG,SVG,.diagram.json · diagrammingtool.com, 20 Sept 2026
- Local storage
- Diagrams are created, rendered and stored in the browser, and editable work can be saved to disk as a .diagram.json file. · diagrammingtool.com, 11 Oct 2026
- Notable limit
- PNG and SVG exports cannot be reopened in the tool for editing; the maker directs users to save the .diagram.json file for that. · diagrammingtool.com, 11 Oct 2026
- Privacy
- The site says it uses Google Analytics and Google AdSense, which can set cookies after consent, and says neither can see diagrams. · diagrammingtool.com, 11 Oct 2026
- Provider icons
- Its bundled icon picker includes AWS, Azure, Google Cloud, Kubernetes, Docker, Terraform, Postgres, Redis, Kafka and hundreds more. · diagrammingtool.com, 11 Oct 2026
- Purpose
- Diagramming Tool creates cloud architecture diagrams, flowcharts, sequence diagrams, ERDs and other diagram types in a browser. · diagrammingtool.com, 11 Oct 2026
- Sharing
- Share links contain the diagram in the URL fragment, which the maker says browsers do not send to a server. · diagrammingtool.com, 11 Oct 2026
- Support
- The site offers feedback, feature request and problem report forms, and says it requests an email address to reply. · diagrammingtool.com, 11 Oct 2026
- Templates
- The site offers 37 starting templates, including AWS architecture, CI/CD, incident response, sequence diagrams, ERDs, delivery plans and charts. · diagrammingtool.com, 11 Oct 2026
- Trial
- The maker says the tool has no trial and no login or sign-up requirement. · diagrammingtool.com, 11 Oct 2026
Where Diagramming Tool stands on Freedom251
- Diagramming Software#22 of 44
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