Compress PDF — Free Online PDF Tool
Reduce file size while preserving quality. Free, no watermarks, no upload — your files never leave your browser.
PDFisPDF processes everything locally in your browser using WebAssembly. No data is ever uploaded to a server — your files never leave your device.
Frequently Asked Questions
- How does PDF compression work without uploading?
- PDFisPDF uses WebAssembly to optimize your PDF structure locally in your browser — removing redundant data, optimizing streams, and reducing file size.
- Will compression reduce my PDF quality?
- The compression removes redundant data and optimizes the internal structure. Text and vector graphics remain lossless.
- How much can I reduce my PDF file size?
- Results vary by file. PDFs with embedded images typically see 20-60% reduction. Already-optimized files may see smaller gains.
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