mermaid-to-image
Convert Mermaid code blocks in Markdown files to PNG images using the mermaid.ink API.
What this skill does
# Skill: Mermaid to Image
Convert ` ```mermaid ` code blocks in Markdown (or other text) files into PNG images, and replace the code blocks with image references. Useful for platforms that don't render Mermaid natively (GitHub Pages/Jekyll, Dev.to, etc.).
---
## When to Use
- The user asks to convert Mermaid diagrams in a file to images
- The user wants to render specific Mermaid code blocks as PNG
- A publishing workflow requires static images instead of Mermaid code blocks
---
## Workflow
### Step 1: Identify target files
The user may specify:
- A single file: `convert mermaid blocks in docs/architecture.md`
- Multiple files: `convert mermaid in all files under docs/`
- A specific code block: `convert the second mermaid block in README.md`
Scan the target file(s) for ` ```mermaid ` code blocks. Report how many blocks were found and in which files before proceeding.
### Step 2: Determine the image output directory
Check the project structure to find where images are typically stored:
```bash
# Look for common image directories
ls -d images/ img/ assets/ assets/images/ static/images/ docs/images/ 2>/dev/null
```
**If a clear image directory exists** (e.g., `images/`, `assets/images/`), use it. Create a subdirectory by topic if appropriate (e.g., `images/<topic>/`).
**If no image directory is obvious or multiple candidates exist**, ask the user:
```
Where should I save the rendered Mermaid images?
1. images/ (create new)
2. assets/images/
3. docs/figures/
4. Custom — enter a path
```
### Step 3: Render each diagram to PNG
Use the [mermaid.ink](https://mermaid.ink) API to render diagrams. Run this Python snippet for each block:
```python
import base64, urllib.request
def render_mermaid(code: str, output_path: str):
"""Render a Mermaid diagram to PNG via mermaid.ink API."""
encoded = base64.urlsafe_b64encode(code.encode()).decode()
url = f"https://mermaid.ink/img/{encoded}?bgColor=white"
req = urllib.request.Request(url, headers={"User-Agent": "Mozilla/5.0"})
resp = urllib.request.urlopen(req, timeout=30)
with open(output_path, "wb") as f:
f.write(resp.read())
```
**Important:** The `User-Agent` header is required — mermaid.ink returns 403 without it.
#### Naming convention
Use descriptive filenames based on the diagram content, not generic names:
- GOOD: `architecture-overview.png`, `data-flow.png`, `heartbeat-sequence.png`
- BAD: `mermaid-1.png`, `diagram.png`, `image1.png`
### Step 4: Replace code blocks with image references
Replace each ` ```mermaid ... ``` ` block with a Markdown image reference using a **relative path** from the file to the image:
```markdown
```
If the project uses absolute URLs (e.g., GitHub Pages), use those instead:
```markdown
```
Choose the link style that matches the project's existing image references. If unsure, use relative paths.
### Step 5: Report results
After processing, summarize:
- How many diagrams were converted
- Where the images were saved
- Which files were modified
---
## Edge Cases
- **Large diagrams**: mermaid.ink may time out on very complex diagrams. If a render fails, report the error and suggest the user simplify the diagram or try an alternative renderer.
- **Multiple blocks in one file**: process all blocks in order, give each a unique descriptive filename.
- **Already-rendered blocks**: if a mermaid block already has a corresponding image (commented out or adjacent), skip it or ask the user.
- **Non-Markdown files**: the same approach works for any text file containing mermaid code blocks (e.g., `.rst`, `.txt`).
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