How much can the file size be reduced?

Results vary by PDF. Files with lots of redundant internal data can shrink significantly; already-optimized files may not change much.

Is compression lossless?

Yes. No content is removed — only internal PDF structure is optimized.

Name: Compress PDF
Author: SimpleCyto

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Reduce PDF file size instantly

压缩PDF通过以优化的对象流重新保存来减小文件大小。显示压缩前后的大小和节省百分比。不删除任何内容——仅优化内部结构。

取决于PDF中冗余数据的多少。

是的。不会删除任何内容——仅优化PDF的内部结构。