Compress PDF
Lossless mode optimizes the file structure and keeps text selectable. Strong mode rasterizes pages for maximum savings on scanned documents.
Zero Uploads — 100% On-Device Processing
Drop a PDF to compress — or click to browse
Lossless optimization, or strong compression for scans.
Lossless mode keeps text selectable. Strong mode converts pages to images for maximum savings.
Frequently asked questions
Are my PDF files uploaded to a server?
Never. GhostPDF runs 100% in your browser using WebAssembly-grade JavaScript libraries. Files are read, processed and saved entirely on your device — they never touch a network. It even works offline once the page is loaded.
Is the redaction permanent or just a black box overlay?
Permanent. Unlike tools that draw a rectangle on top of the text (which can be removed), GhostPDF re-renders every page as an image with the redacted regions destroyed. The original content no longer exists in the output file.
Is there a file size or usage limit?
No accounts, no quotas, no watermarks-unless-you-pay. The only limit is your device's memory, since all processing happens locally. Even large PDFs work fine on a typical laptop or phone.
Can you recover my password if I forget it?
No — and that's the point. Password protection is applied on your device and we never see the file or the password. Store it somewhere safe; a protected PDF without its password cannot be recovered.