How to reduce PDF size without losing important readability

Identify critical details first

Before compression, list the elements that must survive: identification numbers, fine print, signatures, stamps, diagrams, photographs, barcodes, and QR codes. Different pages may require different attention.

Keep a copy of the original open so that the output can be compared at the same zoom level.

Start one level below the aggressive option

Balanced is a sensible first attempt for most scans. Move to Maximum only after the Balanced output is readable but still exceeds a required limit.

Repeated compression compounds damage. Always return to the original before trying a different mode instead of compressing the previous output again.

Verification checklist

If one essential element fails, the output is not acceptable even when the file meets the target size.

• Inspect at 100 percent zoom and at the size normally used by the recipient.
• Scan every barcode and QR code with a real device.
• Compare signatures and official stamps with the original.
• Check thin chart lines, decimal points, and characters such as 0/O and 1/I.
• Print one representative page when print use matters.