Compress PDF Online
Reduce PDF document size for free — fast, effective, and completely private.
Drop your PDF file here
Drag and drop or tap to select from your device
How It Works
Choose PDF
Select or drag your file into the browser workspace.
Compress
PDF-Lib shrinks document streams locally in seconds.
Download
Save your compressed PDF directly to your disk.
Need offline PDF tools on your phone?
Get PDFCraft for Android to compress, edit, merge, and scan documents with zero internet.
Frequently Asked Questions
Does compressing a PDF affect visual quality?+
PDFCraft optimizes image structure and metadata inside the document. For text and vector graphics, quality remains 100% untouched. For high-res images, compression balances file size reduction with high visual clarity.
Are my PDF documents uploaded to your server?+
No. All processing is executed strictly inside your Web browser using client-side JavaScript (pdf-lib). Your document never leaves your device.
Is there a file size restriction?+
Browser performance depends on your device RAM. Files up to 50MB work smoothly. For heavy, multi-hundred-page documents, use the PDFCraft Android app.
How much space can I save?+
PDFs containing scanned images or high-res photos often shrink by 40% to 80%. Text-only PDFs see smaller reductions as they are already lightweight.