What Is PDF Comparison? PDF comparison is a process that examines two PDF files to find differences between them. The tool scans both documents and highlights changes in text, images, formatting, and layout. This helps you see what was added, removed, or modified without reading both files word by word. The comparison works by analyzing the content of each PDF at different levels. Some tools look at the actual text characters. Others examine the visual appearance of pages. Advanced methods combine both approaches to give accurate results. Why Compare PDF Tools Exist These tools solve a real problem. When you receive two versions of a contract, report, or manual, finding changes manually takes hours. A single missed difference can cause serious problems. Compare PDF tools automate this work and show all changes in minutes. Businesses use these tools for legal documents, technical manuals, and financial reports. Individuals use them for academic papers, resumes, and personal documents. T...