DoctVault Blog - PDF Processing
Technical guides on PDF processing, digital signature, ID card scanning, watermarks, document privacy and security with pdf-lib and pdfjs-dist.
How to Scan Both Sides of an ID Card on a Single PDF Page
Create a clean A4 PDF with your ID card without a scanner or Word. Local processing, full privacy, professional result in seconds.
The Dangers of Using Online PDF Converters
Your ID on third-party servers: real privacy risks. Why client-side processing is the only safe option.
How to Sign a PDF with Your Finger on Mobile
Sign legally valid documents without a printer or scanner. Professional touch technology with legal validity in Spain and Europe.
Reduce a PDF by 70% for Email and WhatsApp
Compress heavy PDFs without visible quality loss. From 10MB to 3MB in seconds, local processing without uploading files.
Merge and Organize PDFs: Complete Drag & Drop Guide
Learn how to merge several PDFs into one, reorder shuffled pages and organize scanned documents with a visual interface.
Protect PDFs: Professional Watermark and Password
Add a diagonal watermark and AES-256 encryption to your documents. Professional protection without complicated software.
JPG vs PDF: When to Use Each Format for Documents
Definitive technical analysis: when to use JPG, when to use PDF, and how to convert between formats without losing quality.