How much can a PDF be compressed?

Image-heavy PDFs can shrink 40-80%. Text-only PDFs compress less. The tool shows before and after file sizes.

Does compression reduce quality?

Slight image quality reduction may occur. For text documents quality is not affected.

Yes. All compression runs in your browser using PDF-lib. Files are never uploaded to a server.

Password-protected PDFs must be unlocked first using the Unlock PDF tool, then compressed.

← All Tools / Compress PDF

减小 PDF 文件的大小，同时保持最佳的视觉质量。 100% secure, processed inside your browser.

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点击 压缩并下载 PDF — the utility reconstructs the document to strip metadata, optimize PDF structures, and reduce overall size instantly in your browser.
您的文件是 100% 私人 and processed offline in client memory.