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PDF Compress (Optimize Size)
Reduce the size of a PDF locally by re-saving it with object streams and stripping unused metadata.
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About PDF Compress (Optimize Size)
PDF files often carry redundant object tables, duplicate fonts and verbose metadata that inflate their size. This tool re-saves your PDF using compact object streams and strips non-essential metadata, all directly in your browser.
The gains are typically modest (5–30%) because true image re-compression is not performed locally, but the file remains identical visually and never leaves your device.
Frequently asked questions
How much smaller will my PDF be?
It depends on the source. PDFs already saved as 'optimized' or that consist mostly of high-resolution images will compress less. Text-heavy or programmatically generated PDFs often shrink by 10–30%.
Are images re-compressed?
No. Re-encoding embedded images requires lossy decisions; this tool only optimizes the structure of the PDF.
Is my PDF uploaded?
No. Compression runs entirely in your browser using pdf-lib.
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