How do you compress a PDF?
A PDF compressor reduces file size by rewriting the document with optimized object streams and stripping redundant data. This tool loads your PDF, re-saves it with object streams enabled directly in your browser, and hands back a smaller file. Because everything runs locally, your document is never uploaded to a server.
What compression does
This tool rewrites the PDF using compressed cross-reference and object streams, which removes structural overhead and can meaningfully shrink many PDFs — especially those exported from word processors or built up across multiple edits. The visible content and page layout stay intact.
Note that PDFs whose size is dominated by already-compressed JPEG photos will compress less, since the images themselves are not re-encoded.
Private by design
Most online PDF compressors upload your document to their servers. This one does all the work in your browser using a local library, so confidential contracts, statements, and reports never leave your device.