ScanSnap iX1600 Creates Large File Sizes How to Reduce PDF Size
Applies to
ScanSnap iX1600
Last updated
6 February 2026
Problem
Scans created by the ScanSnap iX1600 result in unusually large PDF files. A small stack of documents may produce files that are tens or even hundreds of megabytes in size. Large files can be difficult to email, upload to cloud storage, or archive efficiently.
Excessive file size is usually caused by high resolution settings, colour mode usage, image heavy documents, OCR processing, or minimal compression within the scan profile.
Solution
Optimise scan settings by reducing resolution, adjusting colour mode, enabling compression, and reviewing OCR configuration. In most cases, file size can be significantly reduced without sacrificing readability.
Step-by-step instructions
Check the active scan profile
Open ScanSnap Home and review the profile currently used for scanning. Large file sizes are often linked to specific profiles.
Reduce scan resolution
Set resolution to 300 dpi for standard documents. Higher resolutions such as 600 dpi dramatically increase file size and are rarely necessary for text documents.
Adjust colour settings
If scanning text based documents, switch from full colour to greyscale or automatic colour detection. This reduces image data and file size.
Enable PDF compression
Within the profile settings, select a standard or compact file size option if available. Avoid maximum quality settings unless required.
Review OCR settings
OCR adds additional processing data. If searchable text is not required, disable OCR temporarily to compare file size differences.
Test with a sample document
Scan a single page using the updated settings and compare file size before scanning a large batch.
Split large batches
If scanning many pages, divide the stack into smaller files to improve manageability.
Optional methods or tools
Scan to a local folder first before uploading to cloud storage. Cloud synchronisation can create additional copies that appear larger.
Use built in PDF optimisation tools within your operating system if further compression is required.
Best practices or tips
Avoid using maximum resolution for routine office documents.
Use separate profiles for high quality image scanning and everyday document scanning.
Regularly review and refine scan profiles to match your typical use case.
Check file size before sending large attachments by email.
Large PDF files generated by the ScanSnap iX1600 are typically caused by unnecessarily high quality settings rather than hardware limitations. By adjusting resolution, colour mode, and compression options, you can dramatically reduce file size while maintaining clear readability.
Optimised scan profiles ensure efficient storage, faster uploads, and easier sharing. With properly configured settings, the ScanSnap iX1600 can produce compact, searchable PDFs suitable for archiving, emailing, and cloud storage.
