Stirling-PDF Skill

Self-hosted PDF manipulation platform with 60+ tools via REST API.

Configuration

Set these environment variables:

• STIRLING_PDF_URL — Your Stirling-PDF instance URL (default: http://localhost:8080)
• STIRLING_API_KEY — API key if authentication is enabled

Docs

• Official docs: https://docs.stirlingpdf.com
• Swagger UI: <your-instance>/swagger-ui/index.html on your deployment

Quick Commands

# Use the wrapper script
node ~/.openclaw/skills/stirling-pdf/scripts/pdf.js <operation> [options]

# Examples:
node pdf.js merge file1.pdf file2.pdf -o merged.pdf
node pdf.js split input.pdf -o ./output-dir
node pdf.js compress input.pdf -o compressed.pdf
node pdf.js ocr input.pdf -o searchable.pdf
node pdf.js convert-to-pdf document.docx -o output.pdf
node pdf.js pdf-to-word input.pdf -o output.docx
node pdf.js add-watermark input.pdf "DRAFT" -o watermarked.pdf

Available Operations

Page Operations

• merge - Combine multiple PDFs
• split - Split PDF into parts
• rotate - Rotate pages
• extract-pages - Extract specific pages
• reorder - Reorganize pages

Conversion

• convert-to-pdf - Word, Excel, Images, HTML → PDF
• pdf-to-word - PDF → Word
• pdf-to-image - PDF → Images
• pdf-to-text - Extract text

Content

• compress - Reduce file size
• ocr - Make scanned PDFs searchable
• add-watermark - Add text/image watermark
• add-stamp - Add stamp
• redact - Remove sensitive content
• sign - Add signature

Security

• add-password - Password protect
• remove-password - Remove password
• sanitize - Remove metadata/scripts

Direct API Usage

For operations not covered by the script, call the API directly:

curl -X POST "$STIRLING_PDF_URL/api/v1/general/merge-pdfs" \
  -H "X-API-KEY: $STIRLING_API_KEY" \
  -H "Content-Type: multipart/form-data" \
  -F "fileInput=@file1.pdf" \
  -F "fileInput=@file2.pdf" \
  -o merged.pdf

Check Swagger UI at <your-instance>/swagger-ui/index.html for all endpoints.

Common Endpoints

Notes

• Most endpoints use POST with multipart/form-data
• File input parameter is usually fileInput
• Response is the processed PDF file
• Check Swagger UI for exact parameters per operation