Best Free Diagramming Tools in 2026

Miro is a collaborative online whiteboard platform used by over 80 million users for visual teamwork and innovation. It provides an infinite canvas where distributed teams can brainstorm, diagram, plan projects, run workshops, and map workflows in real time. The platform includes 5,000+ templates for design sprints, agile retrospectives, customer journey mapping, and strategic planning. Miro integrates with 160+ tools including Jira, Asana, Slack, and Microsoft Teams. AI-powered features help generate diagrams, summarize boards, and create structured workflows from unstructured ideas, positioning Miro as a central hub for cross-functional collaboration from discovery to delivery.

Lucidchart is a web-based diagramming application for flowcharts, org charts, and technical diagrams. Real-time collaboration lets teams diagram together. Import from Visio and export to multiple formats. Integrations embed diagrams in Confluence, Google Workspace, and Microsoft apps. Templates and shapes for every use case from network diagrams to user flows. The diagram tool trusted by millions for visual communication.

Zapier Canvas is a free AI-powered diagramming tool for visually planning and building automation workflows. It provides a bird's-eye view of how Zaps, apps, data flows, and team members interconnect within business processes. Users can describe workflows in natural language and Canvas generates visual diagrams that can be directly converted into live Zapier automations, bridging the gap between process planning and implementation with 8,000+ app integrations.

Creately is a visual collaboration platform that combines diagramming, whiteboarding, and work management on an infinite canvas. It supports flowcharts, org charts, mind maps, wireframes, ER diagrams, network diagrams, UML, BPMN, and other diagram types alongside real-time and asynchronous collaboration. The platform includes AI-powered diagram generation (VIZ), custom databases with data-linked visual apps, wiki-like knowledge management, and OKR alignment tools. Creately holds ISO 27001 and SOC 2 Type 2 certifications with regional data residency options. Over 10 million users and thousands of teams use it for process mapping, project planning, and organizational design.

draw.io (also known as diagrams.net) is a free, open-source diagramming tool. Create flowcharts, network diagrams, UML, org charts, and more in your browser. Works offline and integrates with Google Drive, OneDrive, and Confluence. Extensive shape libraries cover every use case. Export to PNG, SVG, PDF, and other formats. No account required, completely free. The diagram tool that proves free can be best-in-class.

This free online diagram software allows users to create a wide variety of diagrams directly in their web browser. It functions as a versatile tool for professionals and students alike, enabling the creation of flowcharts, network diagrams, UML diagrams, ER diagrams, database schemas, BPMN diagrams, and circuit diagrams. The platform is designed for ease of use, providing a comprehensive set of tools for visual communication. A key benefit is its ability to import files from other popular diagramming software like .vsdx, Gliffy™, and Lucidchart™, making it a flexible option for those transitioning from other platforms or collaborating with users of different tools.

FigJam is Figma's online whiteboard for brainstorming, diagramming, and planning. Real-time collaboration with sticky notes, shapes, connectors, and stamps. Templates for retrospectives, user flows, and workshops. Built-in voting, timers, and cursors make facilitation easy. Seamlessly integrates with Figma design files. Where design teams think together before they design together.

Cacoo is a collaborative online diagramming tool by Nulab that lets teams create flowcharts, wireframes, mind maps, network diagrams, and process maps in real time. Multiple users can edit diagrams simultaneously with live cursors, built-in chat, and video integration for design discussions. The platform provides a template library, media assets, and chart components for professional visuals, along with comment-based feedback and secure sharing with password protection. Cacoo integrates with Slack, Google Drive, Confluence, AWS, Microsoft Teams, and supports Visio file imports. Over 4 million users worldwide rely on it for visual collaboration.

XMind is a mind mapping and brainstorming application available on desktop (Mac, Windows, Linux) and mobile (iOS, Android). It supports multiple diagram types including mind maps, org charts, tree charts, fishbone diagrams, and timelines. The Premium tier adds real-time collaboration, cloud sync, and an AI copilot for brainstorming assistance. XMind is popular with students, professionals, and teams who need visual thinking tools for planning, note-taking, and idea organization.

MindMeister is a collaborative mind mapping tool for brainstorming and planning. Teams capture ideas visually, organize thoughts, and create presentations from mind maps. The platform offers real-time collaboration and integrations with productivity tools.

Gliffy is a cloud-based diagramming tool built for teams using Atlassian products, offering native integrations with Confluence and Jira for embedding flowcharts, UML diagrams, org charts, network diagrams, and BPMN flows directly into wiki pages and issues. It features a drag-and-drop interface, AI-powered diagram generation from natural language prompts, and a Zero Egress deployment option that keeps all data within Atlassian environments for compliance-sensitive organizations. Gliffy holds SOC 2 Type II, ISO 42001, and Atlassian Cloud Fortified certifications, and supports ITAR, GDPR, and HIPAA compliance requirements. Over 18 million Confluence users access Gliffy through organizations including Disney+, Netflix, Nike, and Siemens.

RelateDB is a browser-based Entity-Relationship Diagram (ERD) studio designed for visually modeling database schemas. It allows users to create, edit, and manage tables, columns, and relationships with an intuitive drag-and-drop interface. The tool emphasizes an offline-first approach, meaning all work persists locally in the browser via IndexedDB, eliminating the need for servers or accounts and ensuring continuous productivity even without an internet connection. This tool is ideal for developers, database administrators, and anyone involved in designing or documenting database structures. It supports importing existing schemas from DBML or SQL CREATE TABLE statements, and exporting to SQL for Postgres/MySQL, DBML, or image formats (PNG/JPG/SVG) for sharing and documentation. Key features include an auto-layout engine, copy/paste functionality with history, and the ability to organize schemas into workspaces, making it a comprehensive solution for efficient database modeling.

Cvent Event Diagramming, formerly Social Tables, is a comprehensive event design platform that facilitates collaboration between event planners and venues. It enables users to create accurate, to-scale event diagrams and floor plans within minutes, streamlining the event planning process. The platform is designed to improve communication through real-time collaboration, commenting, and file storage, allowing all stakeholders to visualize and refine event layouts. It offers photo-realistic 3D walkthroughs and interactive floor plans, helping venues showcase their spaces effectively and generate more leads, while empowering planners to manage attendee details with visual seating charts and meal management. This tool is ideal for both event planners seeking to design and execute successful events, and venues looking to attract and convert more business by presenting their spaces in an engaging and detailed manner.

Whimsical is a visual workspace for creating flowcharts, wireframes, mind maps, and docs with AI assistance. Features real-time collaboration, templates, and team management.

FlowMapp is a comprehensive website planning tool designed to streamline the process of creating sitemaps, user flows, wireframes, and content architecture. It provides a visual workspace for UX designers, project managers, content strategists, and developers to collaborate and define the structure and user experience of websites and applications. The platform helps users organize information, map out user journeys, and plan content effectively before development begins. By offering dedicated tools for sitemaps, user flows, and content planning, FlowMapp enables teams to visualize complex projects, identify potential issues early, and ensure a cohesive and user-friendly digital product. It aims to improve communication and efficiency throughout the design and development lifecycle.