Reduce PDF file size with adjustable compression. See original vs compressed size and download the optimized file.
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Frequently Asked Questions
Our PDF compressor works by loading the PDF and re-serializing it with optimized settings. It strips unused objects, cleans up metadata, and applies object stream compression. Higher compression levels strip more optional data for smaller file sizes.
No. All PDF compression happens 100% in your browser using the pdf-lib library. Your files never leave your device and are never sent to any server. This makes the tool safe for confidential documents.
Low compression preserves maximum quality with modest size reduction. Medium is a good balance for most documents. High compression achieves the smallest file size but may strip some optional metadata. For documents with mostly text, even High compression maintains excellent readability.
The compression primarily works by optimizing the PDF structure and removing unnecessary data. Text and vector graphics remain crisp at all levels. Embedded images are preserved as-is. The visual quality of your document should remain very close to the original.
Some PDFs are already well-optimized or contain mostly embedded images that this tool does not re-encode. In such cases, the size reduction may be minimal. PDFs with lots of metadata, unused objects, or uncompressed streams will see the best results.