Guide2026-03-215 min read
PDF File Format Explained — Everything You Need to Know
What Is PDF?
PDF (Portable Document Format) was created by Adobe in 1993. It preserves document formatting regardless of software, hardware, or operating system.
Why PDF?
Universal — viewable on any device
Consistent — looks the same everywhere
Compact — efficient file compression
Secure — supports encryption and signatures
Printable — WYSIWYG printing
PDF Features
Text, images, and vector graphics
Fonts embedded in the file
Interactive forms and fields
Digital signatures
Password protection
Bookmarks and navigation
Metadata and properties
PDF Versions
PDF 1.0 (1993) — original release
PDF 1.4 (2001) — transparency support
PDF 1.7 (2006) — ISO standard (ISO 32000-1)
PDF 2.0 (2017) — latest ISO standard
PDF/A — archival format
PDF/X — print-ready format
Working with PDFs
PDFEdits offers 68 free tools to handle every PDF operation — from merging and splitting to editing and converting.