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Frequently asked questions
How does the PDF compression work?
The tool removes unnecessary metadata (author, title, creator) and optimises the internal PDF structure with object streams. Embedded images are not recompressed, so the visual quality stays the same.
How much smaller will my PDF get?
It depends on the PDF. Files with lots of metadata or an inefficient structure can shrink noticeably. For PDFs that are already optimised, the saving may be minimal.
Is any quality lost?
No, the compression is lossless. Text, images and formatting stay identical – only redundant metadata is removed and the structure optimised.
Are my PDFs uploaded to a server?
No. All processing happens locally in your browser. Your confidential documents never leave your device.
How large can the PDF file be?
There is no fixed limit, but very large files need more memory. For files over 50 MB we recommend a device with enough RAM.