Compress PDF
Reduce PDF file size while maintaining quality. All processing happens securely in your browser - no uploads, no servers, complete privacy guaranteed.
Drag & drop your PDF here
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Privacy Guaranteed
Your PDF files are processed entirely within your browser. No data is uploaded to any server, ensuring complete privacy and security during the compression process.
How to Compress a PDF File
1. Select Your PDF
Click 'Select PDF File' or drag and drop your document into the area above. The tool will show you the original file size.
2. Click Compress
There are no complex settings. Simply click the 'Compress & Save PDF' button to begin the optimization process.
3. Save Your File
Our tool instantly reduces the PDF file size in your browser and saves the new, smaller file to your device. You'll see the size reduction percentage.
Frequently Asked Questions about Compressing PDFs
How does this tool reduce PDF file size?
Our tool uses object stream compression, one of the most effective and lossless methods defined in the PDF standard. It restructures the internal data of the PDF to be more efficient, reducing the overall file size without degrading image quality.
Will compressing my PDF lower its quality?
No, the compression method we use is designed to be lossless. It does not re-compress images or remove data, so the visual quality of your document remains identical to the original. It is the best way to compress a PDF without losing quality.
Is it safe to compress a PDF with sensitive information?
Yes. DumPDF performs all compression tasks directly in your browser. Your file is never sent to an external server, making it the most secure option for compressing confidential or sensitive documents.
What is the maximum file size I can compress?
Since the processing is done on your computer, there is no hard file size limit. However, performance will depend on your device's memory and processing power. Most modern computers can handle very large PDF files with ease.