How to avoid PDF optimization
You can exclude PDF files from being auto-optimized by installing and activating our Skip PDF Auto-Optimization helper plugin.
However, there is currently no way to prevent PDF files in your Media Library from being optimized by the Bulk Optimizer, as the helper plugin does not stop bulk optimization of PDFs.
If you’ve already optimized some PDFs and want to revert them, you can search for all your PDF files in media library and restore them to their original versions using our restore feature.
To prevent future optimizations, a potential workaround is to use an FTP program to upload your PDF files to a custom folder outside of your WordPress Media Library (for example, /wp-content/uploads/pdf/). Files outside the Media Library will not be optimized by the Bulk Optimizer.
While this may not be an ideal solution, it is the only option available at the moment.
We do have an issue created on Imagify’s GitHub to add functionality to allow users to exclude specific file types from bulk optimization. While we cannot offer a specific timeframe for when this functionality may be added, you can track the progress here if you’d like: https://github.com/wp-media/imagify-plugin/issues/516
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