**Problem**: Zero-based page numbers were confusing for users who naturally
think of pages starting from 1.
**Solution**:
- Updated `parse_pages_parameter()` to convert 1-based user input to 0-based internal representation
- All user-facing documentation now uses 1-based page numbering (page 1 = first page)
- Internal processing continues to use 0-based indexing for PyMuPDF compatibility
- Output page numbers are consistently displayed as 1-based for users
**Changes**:
- Enhanced documentation strings to clarify "1-based" page numbering
- Updated README examples with 1-based page numbers and clarifying comments
- Fixed split_pdf function to handle 1-based input correctly
- Updated test cases to verify 1-based -> 0-based conversion
- Added feature highlight: "User-Friendly: All page numbers use 1-based indexing"
**Impact**: Much more intuitive for users - no more confusion about which page is "page 0"\!
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
Ryan Malloy
f601d44d99