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

Built for developers, researchers, and technical writers

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
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.

How InkMark compares

See how InkMark stacks up against other Markdown tools for OneNote.

Feature InkMark Others
Instant Rendering Click to edit Manual
Math Formulas Offline Online only
Code Languages 67 Limited
Diagrams 3 engines None
Footnotes Yes No
Import/Export .md Yes No
Task Lists Yes No

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
RECOMMENDED

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.

Download Get the installer
Install Restart OneNote
Write Start using Markdown
Windows 10 / 11 | OneNote 2016 / 365
Download InkMark v1.0.0

Free version included. Enter license key to unlock Pro.

Includes 14-day Pro trial — no credit card needed

System Requirements
.NET Framework 4.8 required ~15 MB

Frequently Asked Questions

InkMark works with OneNote 2016 and the Microsoft 365 desktop version on Windows 10/11. The UWP (Store) and web versions are not supported.

One Pro license can be activated on up to 3 devices. You can manage your activations from your account.

Your license is permanent — InkMark keeps working forever. After 1 year, you simply won't receive new feature updates unless you renew.

No. All rendering happens locally on your machine. Math formulas, code highlighting, and formatting are processed entirely offline. Diagram rendering (Mermaid/PlantUML) uses Kroki.io, which only receives the diagram code, not your notes.

Yes. InkMark includes a 14-day free trial of all Pro features. No credit card required.

Email us at support@inkmark.com. We typically respond within 24 hours.