PDF Compressor

PDF Compressor reduces the file size of a PDF by re-saving it with more efficient internal structure. It is designed for the common scenario where a PDF is just slightly too large to email (e.g. 26 MB when the limit is 25 MB) or where a PDF produced by older software uses legacy internal formats that waste space. The tool works at the PDF structure level: it enables object streams (a PDF 1.5+ feature that groups and compresses multiple internal objects together), removes unused objects, and compacts the cross-reference table. These are lossless optimisations — the visible content of every page is identical to the original, with no reduction in image resolution, no loss of text quality, and no change to fonts or vector graphics. What changes is how the data is packaged internally, not the data itself. It is important to understand what this tool does not do: it does not recompress embedded JPEG images (which are already compressed), it does not downsample high-resolution images to lower resolution, and it does not remove content. If your PDF is 30 MB because it contains twenty 12-megapixel photos, structural compression alone may only save a few percent. For image-heavy PDFs, the best approach is to optimise the images before creating the PDF — use the Image Compressor and Image Resizer tools on the source images first. That said, for typical document PDFs — reports, contracts, presentation slides exported to PDF, forms, scanned documents that have already been compressed at scan time — the structural optimisations often yield meaningful savings of 10-40% with zero quality loss. The tool shows you the original file size before compression so you can compare the result.