Compress PDF

缩小大型 PDF 文件而不影响可读性，以便更轻松地通过电子邮件发送、上传或存储它们。

Select PDF files

or drag and drop files here

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How to compress a PDF

Select the PDF file you wish to compress from your device, or simply drag and drop it directly into the designated drop zone.

Select 'Extreme' for maximum size reduction, 'Recommended' for a perfect balance of quality and size, or 'Less' for lossless structural compression.

Click 'Compress PDF' to securely process your file. Once finished, instantly download your vastly smaller, optimized document.

Drag and drop the oversized PDF you need to shrink into the upload area.

Choose "Extreme" for the smallest file size, "Recommended" for a standard balance, or "Less" to retain maximum image quality.

Click "Compress" and your browser will quickly optimize the file. Download your lighter PDF immediately.

How much smaller will my PDF actually get?▼

这取决于内容。包含大量图像的 PDF（扫描件、照片报告）最多可以缩小 80%，而纯文本文档通常会缩小 10-30%，因为需要优化的内容较少。

压缩后我的 PDF 看起来会模糊吗？▼

仅当您选择“极端”时，它会牺牲一些图像清晰度来换取尽可能小的文件。 “推荐”旨在保持文本清晰和图像清晰，同时仍显着减少文件大小。

Is there a file size limit for compression?▼

压缩在您自己的设备上运行，因此实际上限是您的可用 RAM，而不是固定上限 — 大多数笔记本电脑和手机都可以轻松处理高达 100MB 的文件。

压缩级别之间有什么区别？▼

“Less”应用无损、仅结构压缩，没有可见的质量变化。 “推荐”平衡了日常共享的大小和质量。 “Extreme”优先考虑最小的文件，这会稍微柔化高分辨率图像。

Can I compress a PDF that's already been compressed once?▼

是的，尽管第二次的增益会更小——一旦图像和流已经优化，剩下的冗余数据就会减少。