Import / Export

Format conversion between Markdown, HTML, and more using the unified ecosystem. Test round-trip fidelity.

Try it
Edit the markdown on the left. See the HTML output, rendered preview, and round-tripped markdown (HTML → Markdown) to check conversion fidelity.
Markdown
remark-parse + remark-rehype
HTML
rehype-parse + rehype-remark
Markdown
Input Markdown
 
Round-Trip Analysis
 
Compare the original markdown with the round-tripped version (Markdown → HTML → Markdown). Differences indicate where format conversion loses information:
 
  • GFM tables — generally round-trip well
    •  
  • Task lists — may lose checkbox state in some converters
    •  
  • Code blocks — language hints may be lost
    •  
  • Emphasis nesting — ***bold italic*** may become separate marks
    •  
  • HTML in markdown — raw HTML passes through but may be reformatted
 
Format Support
 
Markdown ↔ HTML
 
Full support via remark + rehype. Handles GFM, tables, task lists, code blocks.
 Supported
 
DOCX → HTML
 
Via mammoth.js. Converts Word documents to clean HTML. Lossy but practical.
 Library Available
 
HTML → DOCX
 
Via html-docx-js or docx library. Generate Word files from HTML content.
 Library Available
 
Markdown → PDF
 
Via md-to-pdf or browser print. Convert markdown to PDF documents.
 Library Available
 
Code
 
typescript 
 
import { unified } from 'unified';
import remarkParse from 'remark-parse';
import remarkGfm from 'remark-gfm';
import remarkRehype from 'remark-rehype';
import remarkStringify from 'remark-stringify';
import rehypeParse from 'rehype-parse';
import rehypeRemark from 'rehype-remark';
import rehypeStringify from 'rehype-stringify';

// Markdown → HTML
const html = await unified()
  .use(remarkParse).use(remarkGfm)
  .use(remarkRehype).use(rehypeStringify)
  .process(markdown);

// HTML → Markdown
const md = await unified()
  .use(rehypeParse)
  .use(rehypeRemark)
  .use(remarkStringify)
  .process(html);