01
Choose the PDF you want to make smaller.
Free PDF tool
Compress PDF Online Free
Reduce a PDF's file size for email, forms, and sharing. Choose the quality level and process the document on your device.
FreeNo signupNo watermarkFiles stay on your device
No account required
Free core editing
No watermark on export
Browser-first workflow
How it works
Use the tool in three steps
Choose a quality level and let the browser compare lossless optimization with a smaller image-based copy before downloading the best result.
02
Select a compression level that balances size and image quality.
03
Compress and download the optimized PDF from your browser.
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Keep working with your PDF
Merge PDF
Combine multiple PDF files into one document directly in your browser. Reorder files first, then download a single merged PDF.
Edit PDF
Make quick PDF changes directly in your browser. No account, no watermark, and no desktop software needed.
Reorder Pages
Fix page order before sending, printing, archiving, or sharing your PDF.
Delete Pages
Remove blank pages, duplicates, old attachments, or pages you no longer need.
FAQ
Questions about compress pdf
How does PDF compression work?
The tool first optimizes the PDF structure. It can also rebuild pages with compressed images when that produces a smaller result.
Does PDF compression reduce quality?
Lossless optimization keeps the original appearance. Stronger compression can flatten pages into images, so lower quality settings trade some sharpness for a smaller file.
Is the PDF uploaded to a server?
No. Compression runs in your browser, and the selected PDF is not sent to a document-processing server.
Can every PDF be made smaller?
No. Some PDFs are already efficiently compressed. The tool compares its output and tells you when the original file is already smaller.