Drop your PDF file here
or click to browse - up to 100 MB per file
Reduce file size while maintaining quality
Drop your PDF file here
or click to browse - up to 100 MB per file
Compression Level
Add a PDF file first
Add a PDF file first
Compress PDF
Reduce PDF file size online while preserving readability. Share large PDFs faster by compressing in one step.
Use one clean processing pass, then do a quick QA review before you share the result.
PDF to PDF/A
Convert standard PDFs to PDF/A for long-term archival and compliance-focused document retention.
Merge PDFs
Combine multiple PDF files into one document online. Reorder input files before merging for a clean final output.
Images to PDF
Convert JPG, PNG, and WebP images to PDF online. Reorder images and build a clean multi-page PDF document.
Standard compression reduces file size by optimizing internal structure and images. SentryPDF offers a standard preset that balances quality and size reduction. For documents with critical images, preview results before sharing.
File size limits depend on your usage tier. Guest users can upload files within the default limit. Larger files may require a signed-in account or Pro subscription.
PDFs containing high-resolution images or embedded fonts are harder to compress significantly. If your PDF is already optimized or contains scanned images at high DPI, the reduction may be minimal.
No. Password-protected PDFs must be unlocked first. Use the Unlock PDF tool to remove the password, then compress, and protect again if needed.
No. Files are stored temporarily in an isolated processing environment and automatically deleted within 30 minutes. Download your result promptly.
Browse additional tools for conversion, compression, editing, OCR, and security.
Step-by-step guides