Document and PDF Generation APIs
Document generation APIs create formatted documents — PDFs, Word documents, spreadsheets — programmatically from templates or data. Used for invoices, contracts, reports, statements, and any application that needs to produce professional-quality documents at scale.
When to Use Document Generation APIs
- Generating invoices, quotes, or receipts from transaction data
- Creating personalised contracts or agreements with customer-specific data
- Producing reports from application data on demand
- Generating onboarding documents, welcome packs, or instructions
- Exporting application data in structured document formats
Approaches to PDF Generation
- HTML-to-PDF: Render HTML/CSS to PDF. Most flexible — designers work in HTML, output to PDF. Tools: Puppeteer/Playwright (headless Chrome), wkhtmltopdf, WeasyPrint.
- Template-based generation: Merge data into DOCX or PDF templates. DocxTemplater, Carbone.io — good for document-centric use cases with fixed layouts.
- Managed PDF APIs: PDFshift, html2pdf.it, Gotenberg — hosted PDF generation services. No server infrastructure to manage.
E-signature Integration
For documents requiring signatures, generation APIs can integrate with e-signature platforms — generate a PDF, send it to DocuSign/Adobe Sign/Yoti for signing. The signed document is returned via webhook when complete.
Considerations
- PDF generation can be CPU-intensive — use async processing for bulk generation
- Fonts and assets must be available to the generation server
- Test output across PDF viewers — rendering varies