Document Format Converter
A document format conversion tool supporting mutual conversion between 12 common document formats including Markdown, Word, HTML, and EPUB. All conversions complete locally in the browser without uploading files, ensuring data privacy. Ideal for document migration, format standardization, and e-book creation.
Key Features
Reliable Conversion Quality
Designed to keep formatting as consistent as possible across different formats, with strong compatibility for common document structures.
Multi-Format Support
Input Formats
- Markdown (.md): Plain text markup language
- Microsoft Word (.docx, .doc): Office documents
- HTML (.html): Web format
- EPUB (.epub): E-book format
- OpenDocument (.odt): Open document standard
- Rich Text Format (.rtf): Rich text format
- reStructuredText (.rst): Python documentation format
- CSV/TSV (.csv, .tsv): Tabular data
- JSON (.json): Structured data
- DocBook (.docbook): Technical documentation format
Output Formats
- Markdown (.md)
- Microsoft Word (.docx)
- HTML (.html)
- EPUB (.epub)
- OpenDocument (.odt)
- reStructuredText (.rst)
- CSV/TSV (.csv, .tsv)
- JSON (.json)
- DocBook (.docbook)
Covers technical documentation, office documents, e-books, structured data, and other mainstream formats.
Batch Conversion
Supports uploading up to 50 files for batch conversion. All files use the same output format, and after conversion:
- Download each conversion result individually
- Download all as a ZIP archive
- View each file's conversion status and error messages
Ideal for batch document migration or unified format standardization.
100% Local Processing
All conversion operations execute locally in the browser:
- Files are not uploaded to any server
- No concerns about data leaks or privacy issues
- Conversion speed limited only by local device performance
- Works offline after the first successful load
Particularly suitable for handling sensitive documents or confidential materials.
Real-Time Progress Display
During conversion, displays:
- Current processing file name
- Conversion progress percentage
- Success/failure count statistics
- Error details (if any)
Understand progress in real-time during large batch conversions to plan time reasonably.
Format Preservation
Conversion process attempts to preserve:
- Heading levels and styles
- Paragraph formatting
- Lists (ordered/unordered)
- Table structures
- Images (some formats)
- Links and references
Complex formats may require manual adjustment, but basic structures are typically well preserved.
Use Cases
Document Migration
Migrate from Word to Markdown for version control:
- Batch convert historical .docx documents to .md format
- Add to Git repository for version management
- Continue maintenance using Markdown editors
Technical Documentation Writing
Write documentation in Markdown, export to multiple formats for publication:
- Markdown → HTML: Publish to website
- Markdown → DOCX: Provide editable version
- Markdown → EPUB: Create e-books
Write once, publish everywhere.
E-Book Creation
Convert various formats to EPUB e-books:
- HTML web content → EPUB
- Markdown chapters → EPUB
- Word manuscripts → EPUB
Suitable for self-publishing authors and content creators.
Data Format Conversion
Convert between structured data formats:
- CSV → JSON: For API development
- JSON → CSV: For Excel analysis
- Markdown tables → CSV: Extract data
Office Document Standardization
Unify team document formats:
- .doc (old Word) → .docx (new version)
- .docx → .odt (open format)
- Various formats → HTML (web publication)
Usage Examples
Markdown to Word
Scenario: Convert Markdown technical documentation to Word for non-technical review.
Steps:
- Upload README.md, API.md, and other files
- Select output format ".docx"
- Click "Convert"
- Wait for conversion completion
- Download generated Word documents
Result: Markdown headings, lists, code blocks, and other formats correctly convert to Word styles.
Word Batch to Markdown
Scenario: Migrate historical Word documents to Markdown for version control.
Steps:
- Batch upload 10 .docx files
- Select output format ".md"
- Click "Convert"
- View successfully converted file list
- Click "Download All" to get ZIP archive
Result: All Word documents convert to Markdown, preserving heading levels and basic formatting.
HTML to EPUB E-Book
Scenario: Create e-book from website articles.
Steps:
- Save web content as .html files
- Upload to converter
- Select output format ".epub"
- Download after conversion completion
- Open in iBooks, Kindle, or other readers
Result: HTML content converts to standard EPUB format, readable in various e-book readers.
Important Notes
Initial Loading
First use may take a moment to load conversion resources; ensure a stable network connection. After loading completes, it caches in your browser for subsequent use without re-downloading.
File Size Limits
Recommend individual file sizes not exceed 5MB. Oversized files may cause:
- Slower conversion speeds
- High browser memory usage
- Conversion failures
For large files, suggest splitting into multiple smaller files.
Format Compatibility
Some complex format features may not convert perfectly:
- Word's advanced layout (headers/footers, columns)
- Embedded macros and scripts
- Special fonts and styles
- Complex table merging
Recommend checking and manually adjusting after conversion.
Image Processing
Limited image processing capabilities:
- Embedded images (base64) typically preserved
- External image links may break
- Limited image format conversion support
For documents with many images, recommend keeping original image files and re-inserting after conversion.
Browser Requirements
Works best in modern browsers. If you encounter issues, update your browser to the latest version and try again.
Comparison with Similar Tools
Compared to typical online converters and similar tools, this tool's advantages:
- 100% local processing, data privacy secured
- No file size or quantity limits (only browser performance limits)
- No account registration or payment required
- Reliable conversion quality for common document structures
- Batch conversion support for improved efficiency
Ideal for users needing frequent document format conversions with privacy concerns.



