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Document Viewer

Sharing a user manual, design draft, or demo recording with a non-technical stakeholder shouldn’t require them to navigate raw GitHub trees or decipher raw markdown. Paste any GitHub URL, raw link, or shorthand repo path to render sanitized markdown with relative images, isolated HTML in a sandboxed viewport, or responsive video/audio players, and copy an unlisted link to share.

Fetches document content directly from GitHub or the specified public URL in your browser. No intermediary proxy or telemetry.

Presets:
No document selected

Enter a GitHub document link, general web link, or select one of the presets above to view a document. You can share the resulting URL directly with others.

About this tool

01 · Automatic URL Rewriting

Transforms GitHub web blob URLs (github.com/.../blob/...) directly into raw content endpoints. Accepts shorthand paths like /RailtownAI/railtracks/main/AGENTS.md with zero manual conversion.

Frictionless: Non-technical recipients can open links without cloning or navigating code repos.

02 · Multi-Format Engine

Dispatches markdown to sanitized GFM with relative asset resolution, HTML into an isolated sandboxed iframe, and media (video, audio, image) into responsive native players.

Safety: HTML is sandboxed; Markdown is sanitized via DOMPurify to neutralize script execution.

03 · Unlisted Sharing

Generates direct reader links (coronring.github.io/viewer?doc=...) that bypass navigation menus, enforce noindex search engine headers, and stay out of the AI assistant corpus.

Distribution: Share manuals, design notes, and project drafts cleanly.

Operational Limits & Assumptions

  • · Public Repositories Only: Fetches run client-side in the recipient's browser. Private GitHub repositories requiring authentication or SSO will return 404/403.
  • · Cross-Origin Restrictions: Arbitrary external servers must permit CORS for text fetching. GitHub and GitHub User Content have full CORS enabled by default.
  • · Sandboxed HTML: Sandboxed iframes block top-level frame navigation and storage access for cross-origin defense.
  • · Relative Asset Bounds: Markdown images and relative file links are resolved relative to the document's GitHub directory base.

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