Compress a PDF Without Losing Quality

Quality loss in a PDF is not random; it comes from one specific thing. The text in a normal PDF is stored as vector data, which stays perfectly sharp no matter how much you compress. Only raster images, like photos and scans, actually lose detail when squeezed.

So the trick to compressing without visible quality loss is simple: protect the text, and compress images only as far as they can go before the eye notices. That is exactly what Best Readability mode is tuned to do.

While using the browser tool, your PDF is processed locally in your browser. Pick a target, then use the preview to stop at the point where the file is small but still clearly readable.