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sentinel-markdown — a fast, private Markdown reader that stays locked to the folder you open. No network in the render path, no telemetry, no scripts.
What's new since 1.8.1
Edit any block without leaving the reader (1.9)
- Hover a paragraph, heading, list, table, or fenced block for a quiet edit control — or double-click, or press Ctrl+E — and edit exactly that block's Markdown source in place. A copy tool on the same hover cluster copies the block's exact source.
- Live preview while you edit — Mermaid diagrams, charts, display math, and JSON/YAML/TOML blocks re-render below the editor shortly after you pause typing. An invalid draft keeps the last good render on screen, never a blank pane.
- Safe saves — an edit never overwrites a change made outside the app (saves are conflict-checked against the file on disk), and if the open file changes externally, the document updates around your open editor instead of discarding your work.
- Document-wide undo/redo of committed edits from the toolbar (Ctrl+Z / Ctrl+Y), in addition to the editor's own undo history.
Hardened rendering (1.9.4)
- Chart graphics are re-sanitized in place after every draw, and the editor authenticates its own source-position markers — a crafted document cannot forge edit controls or skew scroll position.
Downloads — which one?
| Package | Scope | Admin? | Preview Pane | Pick it when |
|---|---|---|---|---|
Sentinel-Markdown_1.9.4_x64_en-US.msi |
per-machine (Program Files) | yes | yes | you want the Explorer preview, the Open-with entries, or a managed install |
Sentinel-Markdown_1.9.4_x64-setup.exe |
just for you | no | no | you cannot elevate |
Install one, never both. Both are signed by Integrated Analytic Solutions, LLC and register the .md association; the machine-wide Open-with entries for data types come with the MSI. If you still have a setup exe older than 1.7.6 installed, update via the MSI or the Store rather than running its uninstaller.
Tip after updating via the MSI: if the Explorer preview pane looks stale, restart Windows Explorer once (Task Manager → Windows Explorer → Restart).
Also on the Microsoft Store (automatic updates).