LeanMark is a focused, read-only Markdown viewer. It renders GitHub-flavored Markdown, local images and Mermaid diagrams entirely offline using the system WebView2 runtime rather than a bundled Chromium. Raw HTML is disabled, a strict Content Security Policy is enforced, and remote content is blocked.
Publisher’s description
What is LeanMark?
LeanMark by Abdulfatah Bahbouh is open-source Windows software in the image viewers category. It is written in C++.
Installation and requirements
The publisher provides Portable installers for 64-bit Windows. It runs without installation (portable).
Updates and version history
The current version is 0.4.2, released on October 20, 2026. The version history goes back to September 23, 2026: 2 releases, all linked to the official files. The last update is less than a month old.
Popularity and file types
The source code on GitHub (abooodbah/leanmark) has 6 stars. Similar programs include ImageGlass, Weasis and QuickLook.
Project description on GitHub: “A focused, read-only Markdown viewer for Windows, Linux, and macOS with offline GFM and Mermaid rendering.”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Portable: runs without installation
- Updated in the last two months
Cons
- No native ARM64 build
In short: LeanMark is an open-source image viewer tool for 64-bit PCs.
Is LeanMark safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
049A0A5240CCC6E9CF0FDA3FF957D82EFE47FD0C17D7A12530706B248EE07E2D· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 2 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 0.4.2Latest | October 20, 2026 | — | 64-bit ZIP |
| 0.3.0 | September 23, 2026 | — | 64-bit ZIP |
Install from the command line
Silent install ›winget install --id abooodbah.LeanMark -eRelated guide: How to use winget: install and update apps
Information
- Publisher
- Abdulfatah Bahbouh
- Category
- Image viewers
- Licence
- MIT
- Price
- Free
- Source code
- github.com/abooodbah/leanmark
- Written in
- C++
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- Portable
- Version
- 0.4.2
- Released
- October 20, 2026
- Added to the catalogue
- September 24, 2026
- Versions listed
- 2
- GitHub stars
- 6
- Website
- abooodbah.github.io
- winget ID
- abooodbah.LeanMark
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is LeanMark free?
Yes. LeanMark is open-source software under the MIT licence.
Is LeanMark safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install LeanMark with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does LeanMark run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of LeanMark?
The versions page lists all 2 versions with links to their official installer files, back to September 23, 2026.
Can I use LeanMark without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to LeanMark?
ImageGlass, Weasis, QuickLook, MSBuild Structured Log Viewer and LogExpert. The alternatives page compares them.
