Convert Documents

Convert documents between DOCX, PDF, Markdown, and HTML formats

Convert documents between formats using SuperDoc’s high-fidelity conversion engine.

Usage

const client = new Casedev({ apiKey: 'sk_case_YOUR_API_KEY' });

// Using file upload
const pdf = await client.superdoc.v1.convert({
  file: documentFile,
  from: 'docx',
  to: 'pdf'
});

// Using base64
const docx = await client.superdoc.v1.convert({
  document_base64: Buffer.from(markdownContent).toString('base64'),
  from: 'md',
  to: 'docx'
});

// Using URL
const result = await client.superdoc.v1.convert({
  document_url: 'https://example.com/document.docx',
  from: 'docx',
  to: 'pdf'
});

Parameters

Parameter	Type	Required	Description
file	File	One of	Document file (multipart upload)
document_url	string	One of	URL to fetch document from
document_base64	string	One of	Base64-encoded document content
from	string	Yes	Source format: docx, md, html
to	string	No	Target format: pdf, docx. Default: pdf

Supported conversions

From	To	Notes
docx	pdf	Full fidelity conversion
md	docx	Converts Markdown to Word
md	pdf	Markdown to PDF (via DOCX)
html	docx	HTML content to Word

Response

Returns the converted document as binary data with appropriate content type:

• application/pdf for PDF output
• application/vnd.openxmlformats-officedocument.wordprocessingml.document for DOCX output

Examples

Convert uploaded file

export async function POST(request: Request) {
  const formData = await request.formData();
  const file = formData.get('file') as File;

  const pdf = await client.superdoc.v1.convert({
    file: file,
    from: 'docx',
    to: 'pdf'
  });

  return new Response(pdf, {
    headers: {
      'Content-Type': 'application/pdf',
      'Content-Disposition': 'attachment; filename="converted.pdf"'
    }
  });
}

Generate Word doc from Markdown

const markdown = `
# Quarterly Report

## Executive Summary
Revenue increased by 15% compared to Q3...

## Key Metrics
| Metric | Value |
|--------|-------|
| Revenue | $1.2M |
| Growth | 15% |
`;

const docx = await client.superdoc.v1.convert({
  document_base64: Buffer.from(markdown).toString('base64'),
  from: 'md',
  to: 'docx'
});

fs.writeFileSync('report.docx', docx);

Limits

Limit	Value
Max file size	25 MB
Concurrent requests	10 per API key