Reduce a PDF's file size by re-encoding the images inside it at a lower JPEG quality — useful before emailing a large scanned document.
No — real text stays crisp. Compression re-encodes embedded raster images (like scanned pages or photos); vector text is untouched.
60-70% is a reasonable balance for most scanned documents. Drop lower if file size matters more than image sharpness.
Compression works by re-encoding raster images inside the file. A PDF that is mostly vector text — an exported report or invoice, say — has little image data to squeeze, so the size barely moves. Scans and image-heavy documents shrink the most.
There's no exact target-size mode. Lower the quality slider, download, and check the result — for scanned documents, stepping down to around 40-50% usually gets a large file under common email and web-form limits.
No. The re-encoding happens in your browser using WebAssembly, so the PDF stays on your device.