Mermaid Viewer

Live Preview

Instantly renders Mermaid code as a diagram while typing, eliminating manual rendering steps and streamlining visual feedback for faster iteration.

AI‑Assisted Coding

A “Generate with GPT‑4” button translates natural‑language descriptions into Mermaid syntax, accelerating diagram creation and reducing the learning curve for new users.

Smart Export

Exports diagrams as SVG, PNG, JPG, PDF, or Markdown with DPI control and theme selection, enabling high‑quality assets for documentation or presentations.

Smart Debugging

Highlights syntax errors in real time and offers auto‑correction suggestions, improving code quality and reducing frustration for during diagram authoring.

Real‑time Collaboration

Shares live editor links with teammates, allowing simultaneous edits and instant visual updates, facilitating agile teamwork on complex diagram projects.

Privacy First

Data remains stored locally in the browser; no diagrams are sent to external servers, ensuring user privacy and compliance with data‑sensitive workflows.

No Signup

Users can start creating diagrams immediately without creating an account, reducing friction and making access instant and for quick prototypes.

• Students: Create academic flowcharts and timelines using mermaid viewer online free, instantly preview without signup.
• Developers: Integrate mermaid viewer vscode plugin to render diagrams directly in code editor, enhancing documentation.
• Project Managers: Export Gantt charts and git graphs as high‑res PNG or SVG from mermaid viewer free, sharing quickly.
• Collaborative Teams: Share live editing links in mermaid viewer online to co‑author state diagrams with real‑time collaboration.

How do I save my diagrams?

Mermaid Viewer allows users to download their creations directly from the editor. After composing a diagram, click the “Export” button and choose a format such as SVG, PNG, or PDF. Each format can be customized for resolution, DPI, and light or dark theme prior to saving, ensuring the file is ready for archival or presentation use.

How do I share diagrams with my team?

To share a diagram, simply copy the unique share link generated by Mermaids Viewer. Past this link into an email, chat, or collaboration platform. Recipients with the link can open the diagram in their browser, edit if permissions are granted, or download it in their preferred format without requiring any installation.

What types of diagrams are supported?

Mermaid Viewer supports a comprehensive set of diagram types that are fully Mermaid‑compatible. These include Flowchart, Sequence Diagram, Class Diagram, State Diagram, ER Diagram, Gantt Chart, Pie Chart, Requirement Diagram, Git Graph, C4 Diagram, Mind Map, and Timeline diagrams. Each type follows standard Mermaid syntax, enabling instant rendering in the editor.

Do I need to install anything?

No installation is necessary to use the online Mermaid Viewer. All rendering, editing, and exporting functions run entirely within the web browser, requiring no local editors or plugins. Users can access the editor from any device—Windows, macOS, Linux, or mobile—simply by navigating to the Mermaid Viewer website.

How do I export high‑quality diagrams?

High‑resolution exports are achieved by selecting the “Export” option and choosing a format like SVG, PNG, or PDF. The editor allows adjustment of DPI settings and selection between light or dark modes to match branding or presentation needs. For premium plans, high‑res PNGs are watermark‑free, and additional formats such as JPG and SVG are available.

Can I collaborate on a diagram in real time?

Mermaid Viewer offers real‑time collaboration tools. By sending a live‑edit link, multiple users can edit the same diagram simultaneously. Changes are reflected instantly for all participants, eliminating version conflicts and streamlining teamwork on shared architectural or process diagrams.

Is my data stored on the server?

Mermaid Viewer is designed with privacy in mind. All diagram data and code remain within the user’s browser session. The platform does not store any user-generated content unless the user explicitly opts to save a diagram through a paid plan’s version history feature. This ensures that sensitive project information stays protected and private.

How can I use Mermaid Viewer with VS Code?

Mermaid Viewer integrates with VS Code through an official extension. Once installed, the extension allows you to preview Mermaid diagrams directly within the editor, providing a live preview pane that updates as you type. It also supports exporting to multiple formats and leveraging the same AI generation features available on the online platform.

Mermaid Viewer is an online diagram editor that lets users write Mermaid code, see an instant live preview, share diagrams, and export to SVG/PNG/Markdown—all without registration.

• Paste or type Mermaid syntax into the editor pane; in the right‑hand preview area the diagram will be rendered as you type, giving an instant visual.
• Use the “Generate with GPT‑4” button to convert natural language descriptions into Mermaid code; edit the result directly or refine manually.
• Apply theme and DPI settings in the Export panel; choose light or dark mode, specify SVG or PNG resolution, then click “Export” to download the image.
• Share your diagram by clicking the “Share” button; copy the link or embed code to allow collaborators to co‑edit or view the live diagram.
• If working offline or on a local server, download the Mermaid Viewer app for Windows, macOS, or Linux; launch the binary and use the same editor interface.
• Review syntax highlighting and auto‑correction suggestions in real time; errors flash in the editor and can be resolved before exporting.