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MacDown-3000.0.5.dmg 2026-04-08 7.7 MB
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MacDown 3000 is a modern, open-source Markdown editor for macOS.

Highlights include Quick Look support for Markdown files, new preview themes for GitHub Dark, Google Docs, and Gmail, improved file watching, and resolutions for many user-reported issues.

Security

  • Fix CVE-2019-12138 (directory traversal) and CVE-2019-12173 (RCE via app bundle links) in the preview pane's file:// navigation handler (#356, [#351]) — reported by @jhengels

Fixed

  • Fix file watcher dropping after atomic save by external editors (#354) — reported by @btsai, contributed by @BenCello
  • Fix editor scroll jump during typing at end of long documents (#343)
  • Fix Mermaid diagrams not rendering during live preview (#333) — reported by @rcuisnier
  • Fix preview scroll jump when MathJax is enabled (#330) — reported by @causalcat
  • Fix PDF/print margins to respect Page Setup and remove double margins (#329) — contributed by @2b3pro
  • Fix style reload not updating Preview pane (#328) — reported by @gregwillits
  • Fix main thread crash in userDefaultsDidChange (#323)
  • Fix split view not maintaining 1:1 ratio on resize or maximize (#321) — reported by @5T33Z0
  • Fix Help Menu document window sizing behavior (#319) — reported by @gregwillits
  • Fix dollar-sign math highlighting being applied unconditionally (#317)
  • Fix editor pane menu item not toggling to Restore (#316) — reported by @gregwillits
  • Fix "Move To" failing on macOS Sequoia with ViewBridge error 14 (#303) — reported by @whispersnowleopard
  • Fix word count not updating during typing (#296) — reported by @benel
  • Disable intra-word emphasis by default to prevent underscore false positives (#295) — reported by @pringshia

Added

  • GitHub2 (Dark) preview theme (#350) — contributed by @withakay
  • Google Docs and Gmail preview themes (#348) — contributed by @petems
  • Watch local CSS/JS resources and refresh Preview automatically on change (#327)
  • Auto-save preference to control automatic document saving (#326)
  • Support for user-provided Prism syntax highlighting themes (#324) — reported by @gregwillits
  • Allow flexible space, space, and separator items in toolbar customization (#322) — reported by @gregwillits
  • Quick Look preview extension for Markdown files (#299) — reported by @caius
  • Complete i18n/localization coverage for shell utility strings (#298)
  • Hide YAML front matter in Preview instead of rendering as an HTML table (#312) — reported by @whispersnowleopard
  • Automatic file reload when a document is modified by an external editor (#297) — reported by @btsai

Changed

  • FileURLInlining code cleanup using more idiomatic Objective-C (#304) — contributed by @wltb

Verification

✅ This build is fully notarized and stapled by Apple.

SHA256 Checksum:

1e64e75a73e07494cdf7a504f5b610da72e47ff0112a6c63bc159ff0e99b20a7  MacDown-3000.0.5.dmg

Verify after download:

:::bash
shasum -a 256 MacDown-3000.0.5.dmg

Full Changelog: https://github.com/schuyler/macdown3000/blob/main/CHANGELOG.md

Source: README.md, updated 2026-04-08