A source-preserving Markdown editor. Edit visually — your raw Markdown stays canonical, byte for byte.

Built with Rust + Dioxus Desktop on the OS-native WebView. No Electron. No cloud. No data loss.

bekoedit (from Japanese 逆 abekobe — two sides) gives you two complementary ways to work on the same document:

• Text Mode — raw Markdown in CodeMirror 6 with syntax highlighting
• Form Mode — visual block editor that patches only the changed bytes
• Preview Mode — rendered read-only view
• Split Mode — text and preview side by side

The invariant that holds across all modes:

The raw Markdown file is canonical. Every visual surface is a projection. Every edit is a minimal source patch.

Download the latest release for your platform from Releases.

macOS — binary is unsigned; run once to clear the quarantine flag:

chmod +x scripts/run-macos.sh && ./scripts/run-macos.sh ./bekoedit
./bekoedit

Windows — unblock in PowerShell once:

.\scripts\run-windows.ps1
.\bekoedit.exe

Linux — no extra step:

chmod +x bekoedit && ./bekoedit

Build from source (requires Rust stable + Node.js >= 24):

git clone https://github.com/nabbisen/bekoedit
cd bekoedit && cargo run -p bekoedit

Source-preserving patches — Form Mode edits touch only the target byte range. CRLF endings, tilde fences, non-1 ordered lists, reference links, front matter, HTML blocks, and GFM tables survive round-trips unchanged. Unsupported structures become Raw Markdown Islands — never silently normalized.

Form Mode — paragraphs, headings, bullet/ordered/task lists, blockquotes, fenced code blocks, images, inline links, simple GFM tables. Bold / Italic / Code / Link toolbar. Unsupported structures shown as editable raw islands.

Text Mode — CodeMirror 6 with syntax highlighting, CJK/IME composition-safe (sends to Rust only after compositionend), find-in-file, undo/redo.

Workspace & files — local folder tree, create/rename/delete (trash by default), .git/node_modules/target ignored, Git status badges (M/A/D/?).

Safe saves — atomic writes (temp-file + rename), autosave debounce, external-modification detection, conflict resolution, crash-recovery snapshots, local document history (last 50 saves per document).

Navigation — outline panel with section move, backlinks, full-text search, section-reorder shortcuts.

Accessibility — keyboard-only workflows, role="tree" / role="treeitem", ARIA live regions for save status, EN + JA interface.

Export & templates — one-click HTML export, workspace templates, math block display (LaTeX source; KaTeX-ready).

Five Rust crates with strict dependency ordering — no crate depends on one above it. The WebView boundary is versioned: JS sends compact JSON intent; Rust validates, resolves byte ranges, applies patches, persists.

Test coverage: 253 Rust tests covering adversarial documents (CRLF + emoji + tilde fences + non-1 ordered lists + reference links + front matter + HTML + tables), UTF-8 boundary safety, stale-revision rejection, raw island preservation, atomic save, conflict detection, dirty-document protection, and conflict-safe section/history mutations.

Getting Started · Editing Modes · Source Preservation · Architecture · Contributing · Distribution

Apache-2.0 — see LICENSE. Copyright © nabbisen.