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PDF压缩器

文件优化

压缩PDF
或点击浏览 - 可选择多个文件
最大100MB 安全 Multiple files
Files to compress 0
-
Original
-
Compressed
-
Saved
0 of 0 processed

使用方法

1

Upload your PDF

上传您的PDF文档

2

Choose level

选择所需的压缩级别

3

Download PDF

下载压缩后的PDF

Privacy note

✓

隐私说明

压缩在我们的安全服务器上进行。下载后文件会自动删除，除非您将其保存到账户中。

✓

继续使用工作流程

选择要继续的工作流程

Workflow 当前步骤: 1

免费在线PDF压缩工具

将PDF文件大小减少高达90%而不损失质量。我们的PDF压缩工具使用先进算法优化图片、字体和文档结构，同时保持完美的可读性。

PDF压缩器功能特点

🎯

智能压缩

算法分析内容并为PDF的每个元素应用最佳压缩技术。

⚡

三个质量级别

选择低压缩（最高质量）、中等压缩（平衡）或高压缩（最大空间节省）。

👁️

实时预览

压缩前查看预估大小，做出最佳决策。

🔒

100%私密安全

所有处理都在您的浏览器中进行。您的文件永远不会上传到任何服务器。

何时使用PDF压缩工具？

  • 发送超过邮件大小限制的文档
  • 上传文件到有大小限制的平台
  • 优化PDF以便在网站上快速加载
  • 减少云存储空间占用
  • 准备通过微信或其他即时通讯发送的文档

常见问题

压缩会影响文本质量吗？

不会。矢量文本保持完整。只有嵌入的图片会根据所选级别进行优化。

我可以将PDF大小减少多少？

这取决于内容。包含大量图片的PDF可以减少高达90%。纯文本文档的压缩潜力较小。

压缩机密文档安全吗？

是的。所有处理都在您的浏览器本地进行。没有文件会上传到外部服务器。

我可以同时压缩多个PDF吗？

目前我们一次处理一个文件以确保最高质量。您可以按顺序压缩任意数量的文件。

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免费在线PDF压缩工具

将PDF文件大小减少高达90%而不损失质量。我们的PDF压缩工具使用先进算法优化图片、字体和文档结构，同时保持完美的可读性。

PDF压缩器功能特点

智能压缩

算法分析内容并为PDF的每个元素应用最佳压缩技术。

三个质量级别

选择低压缩（最高质量）、中等压缩（平衡）或高压缩（最大空间节省）。

实时预览

压缩前查看预估大小，做出最佳决策。

100%私密安全

所有处理都在您的浏览器中进行。您的文件永远不会上传到任何服务器。

Batch-Friendly Workflow

Compress one file after another in quick succession. The interface resets instantly so you can process dozens of documents efficiently.

No Software Installation

Works entirely in your browser. No downloads, no plugins, and no Java or Flash required. Compatible with all modern devices.

何时使用PDF压缩工具？

How Does PDF Compression Work?

Our PDF compressor uses intelligent algorithms that analyze every element within your document to apply optimal compression. Images are resampled and re-encoded using modern codecs like JPEG2000 and JBIG2, reducing their size dramatically while retaining visual clarity. Embedded fonts are subsetted so only the characters actually used in the document are kept, trimming unnecessary data. The internal PDF structure is cleaned and linearized, removing duplicate objects, orphan metadata, and unused resources. Depending on the compression level you choose, the tool adjusts the balance between quality and file size. Low compression preserves near-original fidelity, medium offers a strong balance suitable for most business documents, and high compression pushes savings to the maximum while maintaining readability. The entire process is automated and completes in seconds, even for large multi-page documents.

Your privacy is our priority. All uploaded files are processed in an isolated environment with enterprise-grade encryption. Documents are automatically purged from our servers within one hour of processing, and we never analyze, store, or share your content. Our infrastructure complies with GDPR and follows industry-standard security practices.

Pro Tip: Choose the Right Level

Start with Medium compression for most documents. If the result looks great, try High for even more savings. Reserve Low for print-quality PDFs where every pixel matters, such as photography portfolios or medical imaging reports.

常见问题

压缩会影响文本质量吗？

不会。矢量文本保持完整。只有嵌入的图片会根据所选级别进行优化。

我可以将PDF大小减少多少？

这取决于内容。包含大量图片的PDF可以减少高达90%。纯文本文档的压缩潜力较小。

压缩机密文档安全吗？

是的。所有处理都在您的浏览器本地进行。没有文件会上传到外部服务器。

我可以同时压缩多个PDF吗？

目前我们一次处理一个文件以确保最高质量。您可以按顺序压缩任意数量的文件。

Can I compress a PDF without losing quality?

Yes. Using the Low compression setting, the tool reduces file size by optimizing structure and fonts while keeping images at their original quality. Text is never affected regardless of compression level.

Is it safe to compress PDF files online?

Absolutely. Files are transferred over encrypted HTTPS connections, processed on isolated servers, and automatically deleted after you download the result. We never store, share, or access the content of your documents.

Why is my PDF so large in the first place?

Large PDFs usually contain high-resolution images, embedded full fonts, or redundant metadata from the software that created them. Scanned documents are especially heavy because each page is stored as a full-resolution image.

Can I compress a password-protected PDF?

If the PDF has an owner password that restricts editing but allows viewing, compression will work normally. If it requires a password to open, you will need to unlock it first using our Unlock PDF tool.

PDF-Ninja Gmail版 - Chrome扩展

直接在PDF-Ninja中打开Gmail的PDF附件。即时编辑、签名和转换您的PDF！

免费安装扩展

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