SYS 01
Three working views
Use the editor at full width, inspect the rendered document, or keep both panes in split mode. Choose any view as the opening default.
Launch window open Free v1 download
Markdown, cleared for launch.
Sputnik Markdown Viewer
Windows · v1.8.4
Write with the rendered document in view. Export the result to PDF when it is cleared for launch.
A focused desktop tool for README files, technical notes, runbooks, and the Markdown documents developers keep open all day. No account. No cloud workspace. Your files stay on your machine.
Free through the v1 mission.
Windows 10 / 11
104.9 MB
Installer
Current build
v1.8.4
Launch price
Free
Working modes
Editor · Split · Preview
PDF handoff
Included
Cloud account
Not required
01
Working console
Two panes. One source of truth.
Keep the source on one side and the rendered document on the other. Switch to a full-width view when the work needs more room.
The editor and preview can scroll independently, or stay synchronized while you inspect a long document. Click through the source, copy a rendered code block, then export the final document without leaving the app.
- Live rendered preview
- Optional synchronized scrolling
- Markdown and PDF workflows
- Drag-and-drop file loading
- Unsaved-change protection
- Packaged PDF manual
Systems check Six green lights
Small utility. Complete flight deck.
The app stays focused on Markdown, but the routine details are handled. Open the file, keep your place, recover from a bad shutdown, and hand off a PDF.
SYS 02
Tabs and session restore
Keep several Markdown files open at once. Tabs, unsaved text, view state, and scroll positions return after relaunch.
SYS 03
Print and PDF output
Review a paginated print preview before printing, or export a PDF. Both outputs contain only the rendered Markdown document, including Mermaid diagrams.
SYS 04
Document outline
Open a collapsible heading outline for long documents. Selecting a heading moves both the editor and preview to that section.
SYS 05
Image assets
Paste or drop an image, add alt text, and save it into a configurable assets folder with a relative Markdown path.
SYS 06
Clear saves and updates
Get an immediate confirmation after every save, open the Markdown guide, or check the first-party SputnikFX release feed.
Build manifest Four systems online
Every system on the console.
This is a local Windows product, not a browser tab tied to a cloud account. The renderer handles Markdown. A context-isolated Electron bridge owns the desktop work, and the release pipeline carries the complete application to Windows.
Stack 01
Desktop runtime
A local Windows application with a narrow bridge between the document interface and the operating system.
- Electron 42.0.1 Windows application shell and Chromium rendering runtime
- Node.js main process File access, native dialogs, application state, and PDF handoff
- HTML, CSS, JavaScript The custom dark interface and document workspace
- Context-isolated preload A limited desktop API with Node integration disabled in the renderer
Stack 02
Editor and preview
Source and rendered output stay in one working console, with independent views and optional synchronized movement.
- EasyMDE 2.21.0 Editor, split, and full-width preview modes
- CodeMirror 5.65.21 Source editing, selection, search navigation, and scroll state
- Marked 4.3.0 Markdown parsing for the rendered document
- Font Awesome 7.2.0 Interface controls and document-status icons
Stack 03
Document systems
The work stays on the machine. Workspace sessions and image assets are local. PDF exports run through application services.
- Electron printToPDF Local PDF output with the rendered document styling intact
- Workspace sessions Open tabs, unsaved work, pane state, and cursor positions restored after relaunch
- Recent-file state Up to eight Markdown paths retained in a local preferences file
- Native file workflow Open, save, Save As, image assets, drag-and-drop loading, and clipboard access
Stack 04
Release pipeline
One build path assembles the application, installer, manual, and the legal files required for release.
- electron-builder 26.8.1 Packages the production Windows application
- NSIS installer Per-machine setup with install-location choice and Windows shortcuts
- Generated PDF manual The versioned user manual is rebuilt before packaging
- Azure Artifact Signing Publisher verification and trusted timestamping for the application and installer
New
Version 1.8.4
Diagrams from text. Preview before print.
Version 1.8.4 renders Mermaid diagrams from fenced mermaid code blocks and opens a paginated print preview before the Windows print dialog.
Write a flowchart, sequence diagram, or any other Mermaid definition inside a code block and the preview draws it as a diagram. Press Ctrl+P to check the paginated pages first, then print from that preview.
View full changelog
Diagram syntax
Mermaid
Printing
Paginated preview
Windows publisher
Verified
02
Flight plan
Version 2.0 is on the pad.
The next major release moves farther into PDF work. Editing and signatures are planned for the v2 mission.
Those systems are not in version 1.8.4. This release is the lean Markdown console: write, inspect, recover, and export. It remains free until v2 is ready to launch.
PDF editing
Planned
Document signatures
Planned
Current status
In assembly
Launch window Payload ready
Download version 1.8.4.
The Windows installer is available directly from SputnikFX.com. Version 1 is free until version 2.0 launches.
Sputnik Markdown Viewer v1.8.4
Windows 10 / 11 · 64-bit · 104.9 MB
Download Windows installer
Preflight note
This v1.8.4 installer is signed and timestamped. Windows should identify Sputnik Digital LLC as the verified publisher.
SHA-256 C0F18784A5CDAE104FD4E84EB6AB054C5ABE25F362264DFD90FED82A80C66880
Mission briefing.
New to Markdown or need a syntax check? Use the Sputnik field manual for headings, lists, links, code, images, and portable formatting rules.
Read basic Markdown syntaxWhat does Sputnik Markdown Viewer do?
Sputnik Markdown Viewer is a Windows desktop editor for Markdown files. It provides editor, split, and preview modes, then exports the rendered document as a PDF.
Is Sputnik Markdown Viewer free?
Version 1 is free to download until version 2.0 is released. Sputnik Digital Effects guarantees the free download will remain available through at least August 14, 2026.
What is planned for version 2.0?
Version 2.0 is planned to add deeper PDF functionality, including PDF editing and signatures. Those features are not part of version 1.8.4.
Is the current Windows installer digitally signed?
Yes. Version 1.8.4 is signed and timestamped by Sputnik Digital LLC. Windows should show Sputnik Digital LLC as the verified publisher. A SHA-256 checksum is also published on this page.
Need software built for your own crew?
This is a small utility with a complete release path behind it. Bring us the workflow your team keeps fighting and we will map the product that should replace it.