Reading

Mindle renders Markdown and PDF in the same reader window, with the same theme and the same annotation model.

Supported files

• Markdown: .md, .markdown, .mdown, .mkdn, .mkd, .txt.
• PDF: text-based PDFs only. Scanned PDFs render but cannot be annotated.

Opening a file

• Open… (⌘O) — open a local file in a new tab.
• Open URL… (⌘⇧L) — fetch a Markdown or PDF URL. PDFs are cached on disk so reopening is fast and offline.
• Open from Clipboard (⌘⇧V) — render the clipboard contents as a Markdown tab.
• Drag a file onto the Mindle window or icon.

If a file is already open, the existing tab is focused rather than duplicated.

Markdown rendering

GitHub-flavored Markdown, rendered locally — no network round-trip.

• Tables, task lists, footnotes, strikethrough.
• Syntax-highlighted code blocks.
• LaTeX math via KaTeX — inline ($a^2 + b^2 = c^2$) and display blocks.
• Mermaid diagrams. Click to expand.
• Emoji, nested lists, raw HTML.
• YAML frontmatter is shown as a syntax-highlighted code block.
• Inline images render; remote hosts are blocked by default.

PDF rendering

PDFs render in continuous scroll mode, fit to the reader width. Pinch or use ⌘+ / ⌘- to zoom. ⌘0 returns to fit-width.

Text selection, search, and annotations work the same as on Markdown.

Typography

The body is set in a serif at a comfortable size. Two controls beyond that:

• Reading width. View → Reading Width, or ⌘1 / ⌘2 / ⌘3. Three stops: narrow, medium, wide. The choice persists across files.
• Reader font. View → Reader Font. Two options: Serif (default) and OpenDyslexic. The choice persists across files.
• Font size. ⌘+ and ⌘-. Range 0.75×–1.6×. Persists per file.
• Bionic Text. View → Enable Bionic Text. Bolds the leading letters of each word as a reading aid. Off by default.

Themes

Three themes — Light, Sepia, Dark. Cycle with ⌘⇧T. The theme is per-file and persists with the rest of the tab state.

Tabs and windows

• ⌘O opens a new tab in the front window.
• ⌘N opens a new window with its own tab strip.
• ⌘W closes the active tab; if only one tab is open, it closes the window.
• Each window keeps its own tab order, theme, and font scale.

File browser

A scoped sidebar tree of every Markdown and text file in the current folder. Toggle with ⌘⇧F. The tree never escapes upward — when you open a file inside ~/notes/2026/, the browser starts at ~/notes/2026/, not at ~.

Find in document

⌘F opens the find bar. ⌘G and ⌘⇧G step between matches. Works in both Markdown and PDF tabs.

Track changes

When an external write changes the open file — vim, an agent, git pull — Mindle picks it up automatically. Small changes apply silently. Non-trivial changes render as a Word-style track-changes overlay with per-chunk accept and reject.

• Keep All Changes — ⌘⌥⏎.
• Revert All Changes — ⌘⌥⌫.
• Per-chunk controls appear inline on the overlay.

Export

• Export as PDF… (⌘P) — paginated Letter-sized PDF using the print stylesheet. Diff overlays and chrome are stripped.
• Export Annotations… (⌘⇧E) — Markdown or JSON. See Annotations.

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