Safe HTML Print Layout
Edit HTML locally in a script-free, network-blocked preview with millimetre rulers. Bounded typography, borders, spacing and plain @media print/all rules are retained; screen rules and unsupported media conditions are ignored. Navigation, sidebars and marked ads can be hidden. Tables split at rows and repeat headings; embedded raster data images fit the page.
About this safe html print layout
Edit HTML locally in a script-free, network-blocked preview with millimetre rulers. Bounded typography, borders, spacing and plain @media print/all rules are retained; screen rules and unsupported media conditions are ignored. Navigation, sidebars and marked ads can be hidden. Tables split at rows and repeat headings; embedded raster data images fit the page Parses and structures office document payloads locally in memory without transmitting private company files to external servers.
Document parsing & data extraction pipeline
Performs non-destructive manipulation of Portable Document Format (PDF) binary object streams in accordance with ISO 32000-1 and ISO 32000-2 (PDF 2.0). Operates on underlying PDF cross-reference tables (XRef), catalog dictionaries, page trees (/Pages), and content streams via pdf-lib and PDF.js. Implements symmetrical margin cropping based on existing CropBox / MediaBox origin coordinates [x, y], executes 90-degree page rotations, merges/splits page trees, and preserves AcroForm interactive form fields, annotations, and bookmarks.
Worked document extraction example
Scenario: Execute Safe HTML Print Layout with sample data to verify transformation accuracy and output formatting.
Sample input:
Processing: Prepare pages
Illustrative output:
File size & structure constraints
UTF-8 input must be smaller than 10,000,000 bytes. Limits: 20,000 nodes, depth 40, 1,000 headings, 2,000 rules per style block, 200 pages, 100,000 layout steps and 30 seconds including reading. Synchronous parsing/layout cannot be interrupted mid-operation. Editing or changing layout clears the old result. This is a limited print layout, not a full CSS renderer or complete W3C certification. Scripts, forms, SVG/MathML, remote images/fonts, positioning and imported styles are removed. A table row taller than a page or multi-page rowspan is rejected. Left/right breaks mean the next sheet, without duplex parity. Long contents titles and headers may be ellipsized; body text is preserved. Raster images/emoji may remain bitmaps. Chromium is verified; other browsers, native save dialogs and physical printers remain unverified.
Safe HTML Print Layout parses structured OpenXML and PDF data locally. Review exported tables or sheets against original files.
Zero-upload document security boundary
File buffers and document assets in Safe HTML Print Layout are processed in-memory via local browser APIs with zero file uploads to CZOA servers.
Document schemas & interchange standards
ECMA-376 Office Open XML specifications and ISO 32000 PDF reference standards:
- Finite CSS paged-media geometry and Chromium native printing; not complete W3C conformance or all-browser verification
Safe HTML Print Layout verification · Audit standards
How to use it
- Source editor / Choose a local UTF-8 text file
- Theme / Paper / Prepare pages
- Print / Save as PDF / Download prepared HTML
Frequently asked questions
What does the Safe HTML Print Layout produce?+
Operational requirements for "What does the Safe HTML Print Layout produce?" are verified in local memory during execution of Safe HTML Print Layout.
What limits and privacy rules apply?+
Renders client-side HTML print previews with standard paper sizes, pagination guides, and print margins before browser PDF export. After the page loads, processing stays in your browser without uploading the source. Layout runs on the main thread. Cancel or clear stops pending work between synchronous operations.
Which formats and interoperability limits apply?+
Specifically for Safe HTML Print Layout (html-to-pdf-preview): Specifically for Safe HTML Print Layout (html-to-pdf-preview): Specifically for Safe HTML Print Layout (html-to-pdf-preview): Specifically for Safe HTML Print Layout (html-to-pdf-preview): Specifically for Safe HTML Print Layout (html-to-pdf-preview): This is a limited print layout, not a full CSS renderer or complete W3C certification.
Can I run a local example?+
Specifically for Safe HTML Print Layout (html-to-pdf-preview): Specifically for Safe HTML Print Layout (html-to-pdf-preview): Specifically for Safe HTML Print Layout (html-to-pdf-preview): Specifically for Safe HTML Print Layout (html-to-pdf-preview): Specifically for Safe HTML Print Layout (html-to-pdf-preview): In the browser print dialog, choose Save as PDF or a printer. Use the document paper size, 100% scale, and disable browser-added headers and footers. Check the preview before saving.