InkMark
Now available for OneNote 2016 & Microsoft 365

Markdown in OneNote,
finally done right.

Write Markdown, see it render instantly. Click to edit. The best Markdown experience for Microsoft OneNote — syntax highlighting, math formulas, diagrams, and more.

Download for Windows See all features
OneNote — My Notebook
Getting Started Guide
1. Get InkMark from the download page
2. Restart OneNote and enable Auto Render
3. Start writing Markdown — it renders as you type
python
def
hello():
print("Hello, InkMark!")
Rendered with InkMark Live Preview

Everything you need to write Markdown in OneNote

A native OneNote add-in with full Markdown support. No workarounds, no copy-paste — just write.

CORE EXPERIENCE

Instant Rendering

Move your cursor away and Markdown renders automatically. Click any rendered content to edit the source. Seamless and effortless.

Editing

## Getting Started

This is **bold** and *italic* text.

Here is `inline code` and a [link](url).

cursor leaves
Rendered

Getting Started

This is bold and italic text.

Here is inline code and a link.

67 LANGUAGES

Syntax Highlighting

Fenced code blocks with full syntax highlighting. Python, JavaScript, C#, Go, Rust, SQL, and 60+ more languages.

python
def fibonacci(n):
"""Calculate Fibonacci sequence"""
if n <= 1:
return n
a, b = 0, 1
for _ in range(2, n + 1):
a, b = b, a + b
return b
OFFLINE RENDERING

LaTeX Math Formulas

Inline and block equations rendered locally on your machine — no internet connection needed.

$$...$$
∫-∞∞ e-x² dx = √π
$...$
E = mc2
$$...$$
eiπ + 1 = 0
DIAGRAMS

Mermaid, PlantUML & Graphviz

Write diagram code in fenced blocks and see them rendered inline as images. Flowcharts, sequence diagrams, class diagrams, and more.

```mermaid
graph TD
A[Start] --> BDecision
B -->|Yes| C[Action A]
B -->|No| D[Action B]
```
Start Decision Yes No Action A Action B
GFM

Tables

Full GitHub Flavored Markdown tables with column alignment. Create structured data right in your notes.

Feature InkMark Others
Math Formulas Offline Online only
Code Languages 67 Limited
Diagrams 3 engines None
Footnotes Yes No
WORKFLOW

Import & Export

Import .md files into OneNote or export your notes back to Markdown. Seamless round-trip between your tools.

.md file
Import Export
OneNote
☑

Task Lists

Interactive checkboxes. Track to-dos right inside your notes.

📝

Footnotes & TOC

Reference-style footnotes and auto-generated table of contents with [TOC].

🎨

Rich Formatting

Bold, italic, strikethrough, highlight, code, emoji, and more.

⚡

Keyboard Shortcuts

Ctrl+, to reverse render. Ctrl+Enter to exit code blocks. Tab converts to spaces.

Simple, fair pricing

Start free. Upgrade when you need the full power.

Free

$0 / forever

Core Markdown features to get started.

  • Headings, lists, task lists
  • Bold, italic, strikethrough, underline
  • Code blocks (basic)
  • Block quotes, horizontal rules
  • Links & auto-links
  • Auto render & reverse render
Download Free
MOST POPULAR

Pro

$19 / one-time

Full Markdown power. Lifetime license, free updates for 1 year.

  • Everything in Free
  • Syntax highlighting (67 languages)
  • LaTeX math formulas (offline)
  • Mermaid, PlantUML & Graphviz diagrams
  • GFM tables
  • [TOC], footnotes, reference links
  • Highlight, emoji, super/subscript
  • Import & export .md files
Buy Pro License — $19

Get started in seconds

Download the installer, restart OneNote, and start writing Markdown.

Windows 10 / 11 | OneNote 2016 / 365
Download InkMark v1.0.0

Free version included. Enter license key to unlock Pro.

.NET Framework 4.8 required ~15 MB