Compress PDF
Shrink a PDF by re-rendering its pages in your browser - see the saving before you download, and nothing is uploaded.
How this compressor works, honestly
This tool re-renders every page of your PDF to an image at a chosen resolution, encodes each one as a JPEG, and rebuilds a fresh PDF from those images. That is a genuinely different approach from "optimising" a PDF, and it comes with one big caveat: your pages become flat images, so the text is no longer selectable or searchable. Because of that, the method shines on scanned documents and image-heavy files, where there was no useful text layer to begin with, and it is the wrong tool for a clean text PDF you still need to copy from.
Choosing a preset
Three presets trade sharpness against size. High renders at 1.5x with light JPEG compression for print-quality pages at a modest saving. Balanced renders at natural size with firmer compression - a good default. Small renders at 0.75x with strong compression for the smallest file, at the cost of some softness. The tool shows you the original size, the new size and the percentage saved before you download, so you can try a preset and only keep the result if you like it.
When it makes a file bigger
Some PDFs are already tightly optimised, especially ones that are mostly vector text. Turning those crisp pages into JPEGs can add data instead of removing it. When the rebuilt file comes out larger than the original, the tool says so plainly and does not push a bigger download on you - keep your original, or if a cloud mode is offered, that path can compress text PDFs without rasterising them.
Related tools
If you only need part of the document, Split PDF or Delete PDF Pages can cut it down first. Merge PDF combines several files, and PDF to JPG exports pages as standalone images.