Compress PDF
Pick a PDF and get a lighter copy at the quality you choose. This works by rasterising each page and re-encoding it, which is why scans and image-heavy documents shrink dramatically and a plain text document can come out larger, in which case the result line tells you so. The file never leaves your browser.
Drop a PDF here
Files never leave your device: this page has no server to send them to.
How it works
Every page is rendered at a scale tied to the quality dial (100 to 90 renders at 2x, 89 to 70 at 1.5x, below that at 1x), encoded as JPEG, and placed back on a page the same size in points as the original, so an A4 document stays A4. The rebuilt file is compared against the original and the saving is reported honestly, including when there is none.
Frequently asked questions
How much smaller will my file get?
It depends entirely on what is inside. A scanned contract or a slide deck full of photos routinely drops by half or more, because the original stores full-resolution images. A five-page text document may grow instead: text is vectors and fonts, which are far more compact than pixels of the same page.
Does the text stay selectable?
No, and that is the honest trade of this method. Pages become images, so text can no longer be selected, searched or read by a screen reader. If you need a searchable document, compress the images inside it with the tool that produced the PDF instead of flattening the whole file here.
Which quality setting should I use?
Start at 80: on scans it usually halves the size with no visible difference at reading zoom. Drop to 60 for documents you only need on screen, and stay at 90 or above if the pages carry fine print or thin line art, where compression artifacts show up first.