Reduce PDF file size with adjustable compression levels (Low, Medium, High). Optimize PDFs containing forms, annotations, and complex elements. Works offline — your files stay private on your device.
Or drag and drop a PDF file here
PDF compression is useful when you need to reduce file size for email attachments, reduce storage overhead, or improve load times on websites. Not all PDFs compress equally—PDFs with forms, annotations, and metadata structure compress better, while scanned documents may already be fairly optimized.
This page explains the different compression levels, when to use each one, and why browser-side compression keeps your files safe. It also helps search engines understand that this page is about practical PDF workflows, not just generic file shrinking.
Compression depends on your PDF structure and content type. PDFs with forms, annotations, and metadata compress better. Scanned documents may already be optimized and compress less. High compression level can typically reduce file size by 20-50% depending on the original.
Low compression is fastest and removes basic overhead. Medium balances speed and size reduction by removing forms and unused data. High compression is most aggressive, optimizing PDF structure for maximum size reduction but takes slightly longer.
Text and vector graphics remain sharp because compression removes structure overhead, not content. Image quality depends on the original PDF. Most users won't notice quality loss, but always backup your original file.
Compression works best on unprotected PDFs. If your PDF has restrictions, you may need to unlock it first using our PDF unlock tool, then compress the unprotected version.
Smaller PDFs are faster to download, easier to email, take less storage space, and load quicker in applications. Compression is especially useful for sharing large reports, brochures, or batches of documents.
Yes. All compression processing happens in your browser—your files never leave your device. We don't store or upload anything to a server.
