How to Use HTML to PDF
- Step 1: Paste your HTML markup and CSS styles into the code editor panel.
- Step 2: Inspect the sandboxed preview in real time to verify visual layout, typography, and element positioning.
- Step 3: Select target page format (A4 or US Letter), page orientation (Portrait or Landscape), and margin spacing.
- Step 4: Click Convert to PDF to render the canvas stream into a standardized, downloadable PDF document.
Settings & Controls Explained
One Resizer's HTML to PDF tool is engineered for developers, designers, and business professionals who need to convert web layouts, invoices, tickets, and reports into clean documents directly in the browser:
- HTML Code Editor: Full-featured textarea supporting valid HTML5 tags, tables, SVG elements, inline CSS (`style="..."`), and <style> blocks.
- Sandboxed Live Preview: An isolated iframe that compiles and renders your HTML dynamically as you type, ensuring total privacy without executing untrusted external scripts.
- Page Setup & Margins: Configure standard document formats (A4: 210×297 mm / 794×1123 px at 96 DPI; US Letter: 8.5×11 in / 816×1056 px) with customizable margin paddings.
- Orientation Selector: Switch between Portrait (vertical flow) for standard articles/invoices and Landscape (horizontal flow) for wide data tables and presentations.
Supported Formats & Technical Capabilities
| Specification | Technical Capability |
|---|---|
| Accepted Input Formats | Raw HTML5 markup, inline CSS styles, CSS <style> stylesheets |
| Output File Formats | PDF document (.pdf) conforming to standard ISO 32000 specification |
| Rendering Pipeline | HTML2Canvas DOM rasterization + PDF-Lib coordinate embedding |
| Network Privacy | Local browser processing (0 bytes uploaded to external servers) |
Best Practices for Clean HTML-to-PDF Conversion
- Embed Styles Directly: Place all CSS inside a <style> block in the document header or use inline `style="..."` attributes to prevent stylesheet loading failures.
- Use Base64 Data URIs for Images: To ensure embedded graphics render reliably across all browser security environments without CORS restrictions, convert image assets into base64 data URIs (`src="data:image/png;base64,..."`).
- Set Explicit Dimensions on Containers: Define container widths in fixed pixels (e.g., `width: 794px;` for A4 portrait at 96 DPI) or percentage units to avoid viewport overflow and clipped text.
- Multi-Page Pagination: Insert `<div style="page-break-after: always;"></div>` between major sections to control exact page breaks.
Troubleshooting & Key Limitations
- External web images or stylesheets fail to load: Browser Same-Origin Policy (CORS) blocks rasterizing cross-origin image elements onto canvas. Embed images as Base64 strings or ensure the host server serves `Access-Control-Allow-Origin: *` headers.
- Text or tables clipped on the right edge: Wrap wide data tables in a container with explicit width or reduce font sizes using CSS `@media screen` rules.
- Custom Web Fonts render as default system font: If external font files are blocked by the browser, fallback fonts (Arial, Helvetica, Times New Roman, Courier) will be used automatically.
- Interactive JavaScript not executed in export: Canvas conversion captures static rendered DOM state; dynamic animations, video embeds, and active form inputs are flattened upon PDF generation.