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Converting multipage tiff to PDF results in very large files

We currently make use of Aspose.PDF to convert multi-page tiff files to pdf. For some reason these generated pdf’s are very large, for example a tiff with a size of 1770 KB results in a pdf with a size of 54580 KB. The code was implemented based on the examples on your website, and we have also tried all suggestions found here: https://docs.aspose.com/pdf/net/optimize-pdf/#shrinking-or-compressing-all-images without any improvements.

The only solution was to set the IsBlackWhite to true (found here Convert TIF to PDF Massive File Size Increase), which dramatically reduced the size of the PDF’s.

We however have new requirement to also cater for color PDF’s, so this is no longer a viable solution. Do you have any further suggestions? Are you planning on resolving the problem in a future release?


We do improve the API performance and resolve issues in every monthly release of the API. Would you please make sure that you are using the latest version of the API and please share your sample source file with code snippet for our reference if you are facing some issue. We will test the scenario in our environment and address it accordingly.