Compress Large PDF
Shrink a big document down to a sendable size.
Drop your PDF
or
PDF up to 100 MB
Stays on your device. This tool runs in your browser — nothing is uploaded.
How this works
Large files are usually large because of scanned pages or high-resolution photographs, so this page starts from a stronger setting than the default. Because compression runs in your browser there is no upload step, which matters most exactly when the file is big.
Compression runs entirely inside your browser, so your document is never uploaded and there is no waiting on a connection. You will see the exact before and after size, including when the saving turns out to be small.
Frequently asked questions
How large a file can I compress?
Up to 100 MB. The work happens on your own device, so the practical limit is your available memory rather than a server quota or an upload timeout.
Why is my PDF so large in the first place?
Almost always scanned pages or embedded photographs. A scan stores a full image for every page, which is why a 20-page scanned document can dwarf a 200-page text document.
What if it is still too big afterwards?
When a document is mostly scans there is a floor to how far compression can go. At that point the effective move is to send fewer pages — extract just the ones you need, or split the document and send it in parts.