1. Why Portals Impose 500KB / 1MB File Size Caps
Public sector recruitment agencies (FPSC, PPSC, SPSC, KPPSC) and tax authorities (FBR IRIS) receive hundreds of thousands of candidate applications simultaneously. Strict file limits prevent server memory exhaustion and ensure lightning-fast document verification.
2. DPI Resolution & Color Space Optimization
Most mobile phone scanning apps generate oversized PDF documents because they capture 24-bit TrueColor images at 300 to 600 DPI. For standard A4 degrees, CNIC cards, and experience letters:
- 300 DPI Color: ~4 MB per page (Overkill for screen review)
- 150 DPI Grayscale: ~350 KB per page (Ideal for government submission)
- 72 DPI Black & White: ~90 KB per page (Ultra-compressed for 100KB limits)