PDF Compressor

PDFs get large for one of two reasons, and the right fix depends on which applies. Documents produced by word processors are mostly text and vector graphics; they are rarely huge, and when they are it is usually structural overhead. Scanned documents and photo-heavy reports are large because they contain full-resolution images, and that is where the real savings are.

This compressor offers a mode for each case. Lossless optimisation rewrites the document structure — deduplicating resources, packing objects into streams and dropping unused entries. It typically saves 5–25% and changes nothing you can see: text stays selectable, searchable and perfectly sharp.

Image compression is the strong option. Each page is rendered at a resolution you choose and re-encoded as a compressed image, which routinely cuts scanned documents by 70–90%. The trade-off is real and worth stating plainly: pages become pictures, so text in them is no longer selectable or searchable. For a scan that was already a picture of text, you lose nothing. For a text document, use lossless instead.

Try lowering the resolution before lowering the quality; halving DPI removes three quarters of the pixels, which is a much bigger lever than a small quality reduction.

You can also split the document and send it in parts, or remove pages you do not need with Split PDF before compressing.