GEML Viewer

Render .geml and .gemlhistory documents in the browser, with build-time reference checking shown as diagnostics.

GEML Viewer brings native support for General Expressive Markup Language (GEML) directly to your browser. GEML is a plain-text format designed for both people and AI agents, organizing documents with a single "typed block" syntax. With GEML Viewer, any raw .geml or .gemlhistory file you open in your browser—whether local (file://) or hosted on the web (like GitHub raw content)—will be beautifully rendered in place. Key Features: Instant Rendering: Seamlessly renders .geml files without needing an external build step. Computed Tables: Interact with data tables that support computed columns and summary rows. Charts & Diagrams: Native support for geml-chart and inline Mermaid diagram rendering. Math Equations: Beautiful mathematical typesetting using KaTeX. Diagnostics Banner: View build-time reference checking and validation errors directly in the browser. Version History: Visualize .gemlhistory sidecar files to understand document evolution. [Version 1.2.2 Update] Long data blocks no longer hide their tail — 100 lines show and the rest opens with one click, instead of being cut off with no way to see it.