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Compress Scanned PDF

Quick Answer

Scanned PDFs usually shrink by reducing embedded page images, not by changing text. Use Compress PDF, choose the scanned/image-heavy option, then inspect the result for readable text.

A scanner can create one large image for every page, which makes even a short PDF heavy. This page is for scan packets, signed forms, receipts, and document photos that need a smaller copy without pretending OCR or exact-size output is guaranteed.

Try the free tool

Use Compress PDF for this task. Processed entirely in your browser. The selected file is not uploaded to FileLume. No sign-up required.

Open Compress PDF

Quick Facts

File handling
Processed entirely in your browser. The selected file is not uploaded to FileLume.

How to do this

  1. Open Compress PDF and upload the scanned document.
  2. Choose the scanned/image-heavy compression mode.
  3. Process the PDF and download the smaller copy.
  4. Zoom into signatures, stamps, and small text before sending or uploading it.

Ready to try it?

Start with Compress PDF, then review the output before uploading, emailing, or submitting the file elsewhere.

Use Compress PDF

Best for

Scanned forms, receipt packets, signed pages, and PDFs made from phone photos.

Not ideal for

Documents that need OCR, searchable text, or print-quality scan images preserved exactly.

Best for

  • A scanned application packet is too large for upload
  • Receipt scans need to fit in an email
  • A signed PDF form needs a smaller review copy

Tips

  • Keep the original scan until the smaller PDF is accepted.
  • If only a few pages are required, extract them before compressing.
  • Use Safe re-save if preserving selectable text matters more than size.

Not ideal for / limitations

  • FileLume does not add OCR to scanned PDFs.
  • Reducing scanned pages can soften small text.
  • Very large scan packets may hit browser memory limits.

Common Errors & Fixes

Problem: The scan is readable on screen but poor when printed.
Fix: Use a less aggressive setting and submit a larger file if the destination allows it.
Problem: The PDF did not shrink much.
Fix: The scan may already be compressed; remove pages or rescan at a lower resolution if you control the source.

Frequently Asked Questions

Why are scanned PDFs so large?

Each page is often stored as a full image, so resolution, color, and page count drive file size.

Does compression make scanned text searchable?

No. Compression can reduce file size, but OCR is a separate feature.

What should I check after compressing a scanned PDF?

Open the output and review small text, stamps, signatures, and any QR codes before submitting it.

Is this on-device?

FileLume uses on-device PDF processing, with behavior affected by browser support and file complexity.

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