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The simplest way to confirm your PDFs never leave this device:
Disconnect from the internet.
Turn off your Wi-Fi → compressing keeps working. The banner up top turns green.
Compression preset
Lossless
High quality
Balanced
Maximum
Custom
Lossless rewrites streams with deflate & object streams — keeps text selection.
Best default for most PDFs.
Raster modes re-encode each page as a compressed image — most effective when the
PDF contains large or uncompressed images. They also turn text into an image
(no selection or copy-paste). We always run lossless as a baseline and download whichever
result is smallest, so picking a raster preset never makes things worse.
or drop PDF files here
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