How to reduce scanned PDF size without losing readability

Scanned pages are images, so colour, resolution, backgrounds and blank margins can make a short file large. Scanning at twice the width and height creates roughly four times as many pixels.

Resize a scanned document the useful way

Changing paper dimensions alone rarely removes scan pixels. Remove blank pages, crop wide margins, rotate pages, and use grayscale only when colour carries no required information.

Protect important details

Start with balanced compression. Open the downloaded copy and inspect small print, handwriting, stamps, signatures and reference numbers. Confirm page order and size.

Common scanned PDF questions

To reduce MB size, set the real target and use the mildest mode that meets it. Balanced and maximum modes create image-based copies, while lossless mode keeps searchable text.

Compress a scanned PDF without uploading it · Crop oversized scan margins · Make the final scan searchable