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Diagrams

Mermaid Viewer ✓

Create and share Mermaid diagrams instantly in your browser.

Source rating 1.5 (2) 1.8k views 9 saves 1 comments Freemium
Mermaid Diagrams No Sign-Up Diagramming
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In Browser Editing Data Visualization Diagram Editor Diagrams
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Free + from $6.99/mo

Verdict

A quick read before you dig into the full page.

Best if
Create and share Mermaid diagrams instantly in your browser
Skip if
Limited diagram templates
Pick this when
Browser-based diagram editor

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Overview

Mermaid Viewer is an online diagram editor that allows users to create and edit Mermaid diagrams directly in their browsers. The tool features live previews, eliminating the need for a 'Render' button, and users can visualize diagram changes instantly as they type.

Mermaid Viewer also provides AI-Assisted Coding with a 'Generate with GPT-4' feature that converts text descriptions into Mermaid code. Users can export their diagrams in a variety of formats including SVG, PNG, and Markdown, with options for custom DPI and dark or light themes.

Mermaid Viewer supports enterprise integration and offers features such as Docker private deployment and role-based access control. The tool also includes a smart debugging feature with syntax error highlighting and auto-correction suggestions.

For collaboration, Mermaid Viewer supports real-time co-editing of diagrams through shareable editor links. It comes with recommended templates that allow users to quickly start diagramming.

Data in Mermaid Viewer stays in the browser and is not stored on an external server, ensuring user data privacy.

Mermaid Viewer website

Access & connections

Where you can use Mermaid Viewer, and what it plugs into.

Platforms

Web

Integrations

Docker

Capabilities

What this tool accepts, produces, and is strongest at.

Input

  • Code
  • Text

Output

  • Code
  • Text
  • Image

Highlights

  • No Signup

Supported features

  • Autocomplete
  • No Signup
  • PDF
  • Styling
  • Team Collaboration
  • Visual Creation
  • SVG

Pros & cons

Pros

  • Browser-based diagram editor
  • Live preview capabilities
  • Smart export functionality
  • Supports SVG, PNG, Markdown
  • Customizable DPI for exports
  • Light or dark theme options
  • Supports Docker private deployment
  • Role-based access control
Show 17 more
  • Syntax error highlighting
  • Auto-correction suggestions for errors
  • Real-time collaboration feature
  • Editor link sharing
  • Variety of diagram templates
  • Suitable for personal and professional use
  • Multiple plan options
  • Data remains in browser
  • No external server data storage
  • GPT-4 assisted coding
  • Enterprise-level integration
  • No need for 'Render' button
  • Instant visualization of changes
  • Diagramming use case templates
  • Supports real-time co-editing
  • No sign-up needed
  • Privacy-first approach

Cons

  • No offline mode
  • No mobile application
  • Lacks versioning feature
  • Limited free version
  • Doesn't support PDF export
  • Potential DPI customization limitations
  • No personal notes feature on lower plans
  • Limited diagram templates
Show 2 more
  • Translation service absent
  • No customer support on free account

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Releases 1

Initial release December 19, 2025 Current
Initial release of Mermaid Viewer.

Imported reviews 1

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Mahnaz Ghaurfar Dec 23, 2025 v@ initial release

Create and share Mermaid diagrams instantly in your browser

FAQ 12

What is Mermaid Viewer's live preview feature?
Mermaid Viewer's live preview feature allows users to visualize changes in their diagrams as they type, without the need for a 'Render' button. This feature enhances user experience by providing immediate feedback on edits, helping users see their changes in real time.
How does the AI-assisted coding work in Mermaid Viewer?
The AI-assisted coding in Mermaid Viewer uses machine learning capabilities to convert text descriptions into Mermaid code automatically, simplifying the process of diagram creation. By clicking on the 'Generate with GPT-4' button, users can have their text descriptions swiftly translated into code.
What formats can I export my diagrams in with Mermaid Viewer?
Mermaid Viewer allows users to export their diagrams in several formats. These include SVG, PNG, PDF, and Markdown. This export versatility accommodates a variety of user needs and preferences for different formats in different contexts.
What is the role of Docker private deployment in Mermaid Viewer?
The role of Docker private deployment in Mermaid Viewer supports businesses and teams who need to maintain their data within their own servers for security reasons. This feature allows them to deploy Mermaid Viewer on their private servers, maintaining control over their data while benefiting from the functionalities of the tool.
What features make Mermaid Viewer suitable for businesses?
Mermaid Viewer offers several features making it suitable for businesses. These include Docker private deployment for security purposes, role-based access control for managing team permissions, real-time collaboration for collective editing of diagrams, AI-assisted coding for speed and efficiency, and smart export functions to cater to various needs.
What types of syntax errors does Mermaid Viewer identify?
Mermaid Viewer identifies various syntax errors that may occur during the creation of diagrams. The tool does not specify the types of syntax errors it can highlight; however, it does provide users with auto-correction suggestions to aid in debugging and smooth the diagram creation process.
How can I collaborate in real-time using Mermaid Viewer?
Real-time collaboration in Mermaid Viewer is facilitated by allowing users to share editor links with their team members. With these links, team members can co-edit diagrams in real time, enhancing productivity and cooperation among team members.
What types of diagrams does Mermaid Viewer offer templates for?
Mermaid Viewer offers templates for various types of diagrams. The specific examples provided on their website include Governance Committee Decision Flow and Wireframe Collaboration Flow. These templates cover usage cases such as course lifecycle and semester timeline, providing users with a head start in their diagram creation.
Is Mermaid Viewer appropriate for personal use, or only professional?
Mermaid Viewer is suitable for both personal and professional use. It offers several subscription plans to cater for different user needs. The free plan is a perfect way for individuals to start creating and sharing diagrams, while the Starter and Pro plans offer advanced features for professional use.
How can I customize the DPI in Mermaid Viewer?
In Mermaid Viewer, the customizable DPI is part of the smart export function. Users are allowed to save their diagrams not only in different formats such as SVG, PNG or Markdown but also with customizable DPI. This function does not detail how the DPI can be adjusted. However, it enables users to decide the level of image resolution suiting their needs.
Can Mermaid Viewer be used for co-editing diagrams?
Yes, Mermaid Viewer supports real-time collaboration, where multiple users can co-edit diagrams. This is achieved by generating shareable links to the editor, allowing team members to concurrently edit and view changes made on diagrams.
What light and dark themes are available in Mermaid Viewer?
Mermaid Viewer allows users to choose between light and dark themes when they are exporting their diagrams. This provides versatility, accommodating different user preferences and the context in which the diagram will be utilized.
Mermaid Viewer Free + from $6.99/mo
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