HTML to PDF Online

How to Convert HTML to PDF

1. Paste HTML or upload an .html/.htm file.
2. Review the sanitized preview.
3. Choose page size, orientation and margins.
4. Convert the safe visual content into PDF pages.

Paste HTML vs Upload HTML

Paste mode is useful for snippets, generated reports and self-contained markup. File mode reads an HTML file directly from your device. The file never has to be uploaded to the website server.

HTML and CSS Support

Common HTML elements, tables, inline styles, flexbox and many browser layout features can render. Complex CSS may differ because the conversion uses the browser's visual model rather than a dedicated print engine.

Page Size and Margins

You can choose A4, Letter or Legal, then use portrait or landscape orientation and several margin presets. Content is rendered in page-sized slices rather than as one giant screenshot.

Page Breaks

Explicit CSS page-break rules are useful but browser rasterization does not provide complete CSS Paged Media support. Long content is therefore paginated visually and may split some complex elements.

Images and Fonts

Embedded data-URL images and locally represented content can render. Remote HTTP and HTTPS resources are removed instead of being silently fetched, which prevents untrusted HTML from causing hidden third-party requests.

Security and Script Removal

Script elements, inline event handlers, javascript: links, forms, embedded objects and unsafe frames are removed. The preview is additionally loaded in a sandboxed iframe without script permission.

Why External Images May Not Appear

Arbitrary remote websites and assets are limited by browser CORS and privacy boundaries. This tool does not use a hidden proxy to bypass those restrictions.

Browser Privacy

The HTML source stays in the browser. Conversion uses the sanitized DOM and local PDF writer without sending your markup to a remote API.

Troubleshooting

If an element does not render as expected, simplify unsupported CSS, embed images as data URLs, and avoid relying on external fonts or scripts. Large pages can require significant browser memory.

Paste HTML or Upload an HTML File

The converter has two local input paths. Paste HTML is convenient for snippets, generated reports and content copied from an editor. Upload HTML accepts .html and .htm files from the device. Both paths go through the same sanitizer and browser rendering model before PDF creation. The tool does not send pasted source or uploaded markup to a remote HTML conversion endpoint.

Why HTML Is Sanitized First

HTML can contain executable code, event handlers, forms, embedded objects and URLs that cause network requests. Those behaviors are inappropriate for an untrusted file converter. Before preview, scripts, object/embed/iframe content, event-handler attributes, javascript: URLs, unsafe form content and remote HTTP asset references are removed or neutralized. The preview is then placed in a sandboxed iframe without script permission.

CSS and Layout Support

The browser can parse normal HTML and inline or embedded CSS, but the final PDF renderer intentionally uses a controlled visual pagination model rather than executing an unrestricted webpage. Headings, paragraphs, lists, images and tables are strong use cases. Complex flexbox/grid positioning, browser-specific effects, filters, fixed-position overlays and unusual CSS can be simplified. The preview helps identify content that should be adjusted before conversion.

External Images, Fonts and Stylesheets

A standalone HTML file can reference sibling files or remote resources that the browser cannot safely access from a selected file. For privacy and security this converter does not automatically crawl the local filesystem or proxy remote content. Self-contained data URLs and safe inline CSS are the most predictable. Cross-origin URLs are deliberately removed by the sanitizer in this production build, so embed important images directly when creating a portable HTML file.

Page Size, Orientation and Margins

A4, Letter and Legal are available with portrait or landscape orientation. Margins determine the printable area used by the visual paginator. Fit-to-page behavior is designed for ordinary document content, not for reproducing an entire infinite-scrolling web application. If a wide table is important, choose landscape and simplify unnecessary columns before conversion.

Long Documents and Page Breaks

Long content is divided into multiple PDF pages as the browser renderer fills the printable area. Ordinary block boundaries and tables are handled in sequence. Some CSS Paged Media rules are more sophisticated than this lightweight renderer, so exact @page, break-inside and browser-print-engine behavior is not promised. When a precise forced break is essential, preview the content and split it into clear document sections.

HTML Is Not the Same as Arbitrary URL Conversion

This page intentionally does not claim that it can convert any public website URL. A pure browser page is constrained by CORS, authentication, anti-bot systems, cross-origin fonts and images, and other browser security boundaries. A hidden proxy would violate the client-side requirement. If you need a page from another site, save or export appropriate self-contained HTML content first and then use the upload mode.

Useful HTML to PDF Workflows

Good uses include converting locally generated invoices, simple reports, documentation, email-like templates, tables, printable forms and archived article content that you control. Before sharing the result, check the first and last pages, important images and tables, and any content that depended on CSS layout. The generated PDF is static; scripts and interactive controls are intentionally excluded.