压缩PDF
在线免费压缩PDF文件，无需上传，所有处理在浏览器中完成。
压缩说明
pdf-lib 提供有限的压缩能力。它会移除未使用的对象并优化内部结构。
上传 PDF 进行压缩
Frequently Asked Questions
How much can I compress a PDF?
Most PDFs can be compressed 50-80% without visible quality loss. Text-heavy PDFs compress the most. Image-heavy PDFs see smaller reductions unless you're willing to accept some quality loss for smaller file size.
Will compressing a PDF reduce print quality?
At medium compression, most people can't tell the difference in printed output. For professional printing (brochures, magazines), use light compression to preserve maximum quality.
Is PDF compression safe for sensitive documents?
Yes — our compressor works entirely in your browser. Your PDF never leaves your device, never touches a server. This is especially important for legal documents, contracts, and personal records.