100% Client-Side PDF 1.4 Synthesis & Document Long-Image Stitching
Never upload confidential contracts, KYC identity scans, or financial invoices to third-party cloud PDF mergers again. Our Local Privacy PDF Toolkit runs entirely inside your browser’s memory with zero server uploads and no page count paywalls.
- Native Binary PDF 1.4 Engine: Directly assembles PDF Catalog, Page trees,
/DCTDecodeimage streams, and byte-accuratexreftables in pure TypeScript for instant.pdfdownloads. - Anti-Fraud Diagonal Watermarking: Stamp semi-transparent confidential watermarks and page numbers onto sensitive ID or contract scans before sharing them externally.
- Seamless Vertical Long-Image Stitcher: Combine multiple document pages or screenshots into a single high-DPI PNG, WebP, or JPEG long image.
Frequently Asked Questions (FAQ)
Q1 Why is a 100% client-side PDF builder safer for contracts, IDs, and tax invoices?
Traditional online PDF converters upload your sensitive scans (passports, signed NDAs, bank statements, medical records) to remote servers where files may be logged or cached. Our PDF Toolkit constructs a compliant ISO PDF 1.4 binary stream directly inside your browser memory using typed arrays—your documents never leave your device.
Q2 How does the binary PDF 1.4 generator work without external libraries or server APIs?
Each page is composited onto a high-resolution HTML5 Canvas (applying A4 scaling, margins, rotation, and optional diagonal watermarks), encoded as a DCTDecode JPEG byte stream, and wrapped into a native PDF 1.4 object graph with an exact byte-offset cross-reference (xref) table.
Q3 When should I use the Vertical Long-Image Stitcher mode?
When sharing multi-page receipts, chat logs, or slide decks on mobile messaging apps or social media where scrolling a single tall PNG/
WebP image is faster and more convenient than opening a PDF attachment.