Compress PDF — Free, Fast & Private
Be clear about what this page is. MiniPx does not have a one-click PDF compressor, and saying otherwise would waste your time. What it has is a two-part PDF tool that gets you to the same place for the documents people actually need to shrink: scans.
The route is: open the PDF tool, use PDF to image to render every page to JPG or PNG, run those pages through the image compressor, then use image to PDF to bind them back into one document. A 10 MB scan of a certificate set typically comes back at 1-3 MB.
The trade-off is real and worth stating before you start. Rebuilding this way rasterises the whole document, so any selectable text becomes part of the page image. Text stops being searchable and copyable, and the file will not pass a portal that requires machine-readable text. For a scanned document that was already an image, you lose nothing. For an exported report or a contract with live text, do not use this route — export it again at a lower image quality from whatever produced it.
Everything runs in your browser using PDF.js to render and jsPDF to rebuild. Your documents never leave your device, which is the point for legal contracts, financial statements, medical records, and ID paperwork.
Most email services cap attachments at 25 MB, and many form portals want PDFs under 5 MB or 2 MB. Compressing the page images at the middle step is the lever that gets you there.