I Built GRSMD: A Browser-Based Markdown Viewer

2026-03-08 : Gen2 Released!
👉 GRSMD has Evolved! AI Output → [R] Single-Action Review

GRSMD: GoodRelax Simple Markdown Renderer & Viewer is a privacy-focused Markdown renderer & viewer that runs entirely in your browser.

• Completely free, ad-free, no installation required, no plugins needed, and open source.
• Markdown, Mermaid, LaTeX (math equations), and syntax highlighting are rendered entirely client-side.
• PlantUML is rendered only with user consent.
• No backend, no data collection.
• Mermaid/PlantUML diagrams can be copied as SVG/PNG and pasted into PowerPoint.

Website

You can try it out directly on the following page:

👉 https://goodrelax.github.io/gr-simple-md-renderer/

How to Use

1. Open the page and paste your Markdown with Ctrl+V, or drag and drop a .md file.
2. Done!

If the content contains PlantUML, it will only be processed after explicit user consent.

Sample Data (for copy-pasting)

Sample data including Mermaid diagrams, sequence diagrams, and code blocks can be found here:

👉 https://goodrelax.github.io/gr-simple-md-renderer/sample-data.md
👉 https://goodrelax.github.io/gr-simple-md-renderer/sample-data-2.md

GitHub

The source code is available here:

👉 https://github.com/GoodRelax/gr-simple-md-renderer

Improvements

2026-02-23: Enabled zooming for large sequence diagrams.
      ... Quite useful for real-world tasks.
2026-03-01: Enabled single-step Markdown view display.
      ... Can't imagine making it any more efficient than this.
2026-03-01: Enabled copying SVG/PNG.
      ... PowerPoint materials are still needed, after all.
2026-03-01: Improved MCBSMD prompts.
      ... You can find out by long-pressing [?].
2026-03-08: Added reload button and code display feature.
      ... Might help you get into a flow state? Haha.