1. What Is Compress PDF? Compress PDF is a process that makes PDF files smaller by removing unnecessary data and applying compression algorithms. A PDF file contains text, images, fonts, and structure information. Compression reduces the space these elements take up without changing how the document looks. This tool exists because PDF files often become too large to email, upload, or store efficiently. Compression solves this problem by reorganizing the file's internal data to use less space. 2. Why Does This Tool Exist? PDF files grow large for many reasons: High-resolution images embedded in the document Multiple fonts included in the file Interactive forms and annotations Metadata and hidden information Repeated elements that aren't optimized Large PDFs create problems: Email systems often reject attachments over 25MB Websites have upload limits (often 10-50MB) Storage space costs money Large files take longer to download and open Compression solves these problems by reduc...