Compress PDF
Compress PDF files online for free. Reduce PDF size for email, uploads and sharing with UsePDF.io.
Drop a PDF to compress
Upload one PDF and reduce file size with a server-side compression pass.
or drag files here
Best for reducing file size before sharing or uploading. Compression strength affects visual quality.
Supported formats
Source PDF
Review the current PDF before compressing it.
No PDF loaded yet
Upload a PDF and its pages will appear here before compression starts.
Upload a PDF to begin
Upload one PDF and reduce file size with a balanced or stronger compression pass.
Compression level
Frequently Asked Questions
How do I compress a PDF online for free?
Upload your PDF to UsePDF.io, choose a compression level, and download the smaller file. No sign-up or software installation required.
How much can I reduce a PDF file size?
Depending on the content, PDFs can be reduced by 20% to 80%. PDFs with many images compress the most.
Will compression reduce the quality of my PDF?
The 'Low' compression setting preserves near-original quality. 'High' compression reduces file size the most with some quality trade-off.
What is the maximum file size I can compress?
Files up to 50 MB are supported.
Is my PDF safe when compressing online?
Yes. Files are processed securely and deleted from our servers immediately after compression.
What this tool does
Compress PDF reduces file size when a document is too large to email, upload, or archive efficiently.
Choose a balanced or stronger compression pass depending on whether quality or smaller size matters more. Image-heavy PDFs usually shrink the most, while text-heavy PDFs may already be optimized.
Upload one PDF and download a smaller PDF after server-side optimization. UsePDF.io keeps the workflow simple: upload your file, review the result when preview is available, and download the output when processing is complete.
How to use it
- 1Upload your PDF.
- 2Choose the compression level.
- 3Download the compressed PDF.
Supported formats
File privacy: Files are processed only for the action you request. We avoid using document contents for analytics, and you should only upload files you have permission to process.