PDF Compressor

PDF Compressor rebuilds a PDF at a smaller size so it fits email attachment limits and government upload forms. Scanned documents are the usual culprit: a ten-page scan can easily exceed 20 MB because each page is stored as a full-resolution, lightly compressed image. Re-rendering those pages at a sensible resolution and JPG quality typically cuts the document by 70–90%.

Every page is rendered to a canvas at the scale you choose, re-encoded as a JPG at your chosen quality, and reassembled into a fresh PDF with the same page order and proportions. Higher scale keeps small print legible; lower quality shrinks the file fastest. For text-heavy scans, a scale of 1.5 with 70% quality is a good starting point.

Nothing you open here is uploaded. The entire operation runs inside your browser tab using the Canvas API and WebAssembly, which means there is no upload queue, no server-side file-size cap, no watermark and no account. You can even go offline after the page has loaded and the tool will keep working. When you close the tab, every trace of your file disappears from memory — which is exactly what you want when you are handling ID documents, contracts, private photos or unreleased product shots.

Because the work happens on your own hardware, processing is effectively instant for typical photos and still comfortable for 50-megapixel files on a modern laptop or phone. There are no daily limits, no paywalls after five files, and no queue behind other users. Everything is free, unlimited and ad-supported, and the layout reserves fixed space for ads so the page never jumps while you work.