Compare HyperText Markup Language and Portable Document Format formats — understand the key differences and when to use each
HyperText Markup Language
HyperText Markup Language (.html) is a document file format.
Portable Document Format
PDF (Portable Document Format) was created by Adobe in 1993 and is now the world's most widely used document format, standardized as ISO 32000. PDF preserves exact formatting, fonts, images, and layout across all devices, operating systems, and printers. It supports interactive forms, digital signatures, password protection, and accessibility features. PDFs can contain text, vector graphics, raster images, and even embedded multimedia. The format is ideal for contracts, invoices, reports, eBooks, manuals, and any document where consistent visual presentation is critical. PDF/A is an archival variant used for long-term document preservation. Modern PDFs support layers, 3D content, JavaScript, and annotation tools. With Convert999, you can convert PDF files to Word (DOCX), images (JPG, PNG), spreadsheets (XLSX), presentations (PPTX), and many more formats — all processed locally in your browser for maximum privacy.
| Feature | HTML | |
|---|---|---|
| Full Name | HyperText Markup Language | Portable Document Format |
| File Extension | .html | |
| Category | document | document |
| Free to Convert | ✓ Yes | ✓ Yes |
| Browser Support | ✓ All Browsers | ✓ All Browsers |
| Convert to Each Other | ✓ Yes | ✓ Yes |
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最大ファイルサイズ：2GB