Free PDF Compressor Online
Reduce the size of any PDF file for easier sharing and faster uploads. Choose your compression level and download the optimised file instantly — free, no sign-up.
Drop your PDF here to compress
or click to browse — PDF files only
Three simple steps
No software, no account, no wait.
Upload Your PDF
Drag and drop your PDF file or click to browse. Files up to 100 MB are supported.
Choose Quality
Select Low (smallest file, some quality reduction), Medium (balanced), or High (minimal compression, best quality).
Download Compressed PDF
Click Compress PDF. The optimised file downloads and you see exactly how much space was saved.
Frequently asked questions
Upload your PDF, select the compression quality level, and click Compress PDF. The smaller file downloads instantly with a size reduction percentage shown.
Results vary by PDF content. PDFs with many high-resolution images can be reduced by 50-80%. Text-heavy PDFs typically reduce by 10-30%. You will see the exact saving after processing.
Low: maximum compression, reduces image quality — best for archiving. Medium: balanced compression, keeps quality acceptable for most uses. High: minimal compression, near-original quality for professional printing.
Up to 100 MB per file. For very large PDFs, the process may take a few seconds longer.
No — text is never re-encoded or degraded during compression. Only embedded images may lose some quality at low settings.
Reduce PDF Size Free Online
Our PDF compressor uses PyMuPDF to optimise your PDF — removing redundant data, deflating streams, and reducing embedded image resolution at aggressive settings. The result is a smaller file ready for email or upload.
Why Compress a PDF?
Email attachments often have size limits (5-25 MB). Portal uploads, Google Drive, and cloud storage may flag large files. Compressing a PDF makes it faster to share, cheaper to store, and quicker to load on mobile devices.
Compression Levels Explained
Medium is suitable for most PDFs and produces a good balance of size and quality. Use Low when file size is critical and you can accept some visual degradation (e.g. archiving old documents). Use High when the PDF will be professionally printed.
PDF Compression vs Re-export
Simply opening and re-saving a PDF in Adobe Acrobat or Preview also compresses it, but results are inconsistent. Our tool uses PyMuPDF's garbage collection and stream deflation for more predictable and reliable size reduction.