MARZPDF Compressor
Shrink a PDF's file size by optimizing its internal structure.
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About this tool
Upload a PDF to reduce its file size by re-saving it with a more compact internal object structure — processed entirely in your browser, no upload required.
How to use
- Upload a PDF file.
- Wait for optimization to run automatically.
- Compare the before/after size and download the smaller file.
FAQ
How much smaller will my file get?
It depends on the PDF — files with many fonts, pages, or objects (and no existing object-stream compression) shrink the most. This tool re-packs the PDF's internal structure; it does not re-encode or re-compress embedded images, so already-optimized or image-heavy PDFs may barely change.
Will quality be affected?
No — this only changes how the PDF stores its internal objects, not the visual content, so pages look identical.