⚡ Optimize · Free
Compress PDF Online Free
Reduce your PDF file size for easier sharing and email delivery. Choose your compression level and download the optimized PDF instantly.
Drop your PDF here
or click to select a file from your computer
Single PDF file · Processed locally in your browser
How to Compress a PDF
1
Upload your PDF
Drag and drop your PDF or click "Select PDF File". The file stays on your device — nothing is uploaded.
2
Choose compression level
Select Low (best quality), Medium (balanced), or High (smallest file). Medium is recommended for most documents.
3
Click "Compress PDF"
The compression runs in your browser. Larger files may take a few seconds.
4
Download your compressed PDF
See the size reduction and download your optimized PDF with one click.
Frequently Asked Questions
The reduction depends on the content of your PDF. Documents with many high-resolution images can be reduced by 50–80%. Text-heavy PDFs with no images may only reduce by 10–20%, since text is already efficiently encoded. High compression mode will yield the smallest file but may slightly reduce image quality.
No. Text and vector graphics are losslessly compressed and remain perfectly sharp at all zoom levels. Only embedded raster images (photos, scanned pages) may be slightly affected at High compression. Low and Medium modes are virtually lossless for typical business documents.
There's no server-imposed limit — you're only limited by your browser's available memory. Most computers can handle PDFs up to several hundred MB. For very large files (500MB+), we recommend splitting the PDF first, compressing each part, then merging them back.