Learn PDF
This learning center contains 4 comprehensive guides about PDF concepts and techniques. Each guide follows a structured format: definition, explanation, practical steps, and common issues. Topics include compression, OCR, digital signatures, merging, splitting, and more.
What Is... (Concept Guides)
PDF Compression
PDF compression is the process of reducing a PDF file's size by optimizing images, removing redundant data, and applying compression algorithms. A typical PDF can be reduced by 50-90% depending on content type.
OCR (Optical Character Recognition)
OCR (Optical Character Recognition) is technology that converts images of text—such as scanned documents, photos of pages, or PDF images—into machine-readable and editable text. Modern OCR achieves 95-99% accuracy on clear documents.
Digital Signatures
A digital signature is a cryptographic mechanism that verifies the authenticity and integrity of a PDF document. It uses public key infrastructure (PKI) to confirm the signer's identity and prove the document has not been altered after signing.
How To... (Step-by-Step Guides)
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