压缩PDF

减小PDF文件大小同时保持质量。免费在线PDF压缩器，生成更小的文件。

上传PDF文件

拖放PDF文件到此处。一次最多可压缩10个文件。

Files: 10

关于此工具

压缩PDF在保持可接受质量的同时减小PDF文档的文件大小。这对于电子邮件附件、网络上传或节省存储空间至关重要。

该工具提供多种压缩级别，以平衡文件大小减少和质量保持。您可以选择激进压缩以获得最大的大小减少，或选择轻度压缩以保持更高的质量。

所有压缩都在您的浏览器中进行，确保您的文档永远不会离开您的设备。

如何使用

上传PDF文件
拖放您的PDF文件或点击选择要压缩的文档。
选择压缩级别
选择您偏好的压缩级别：低（最佳质量）、中（平衡）或高（最小文件）。
压缩并下载
点击压缩以减小文件大小，然后下载优化后的PDF。

使用场景

电子邮件附件

减小PDF大小以满足电子邮件附件限制并确保更快的发送。

网络发布

优化PDF以供网络下载，提高页面加载时间和用户体验。

存储优化

压缩存档文档以节省磁盘空间同时保持可访问性。

Practical guide

Why choose local processing?

Large PDF files can contain contracts, invoices, identity details, or internal business information, so keeping processing in the browser reduces exposure.
The website tool is free to use with no usage limits and does not require sign-in.
Local processing also keeps iteration fast: adjust options, preview the result, and export a smaller PDF without waiting for an upload queue.

Best files for this tool

Best for PDF files that open correctly in a modern browser and are not intentionally damaged or restricted.
Works well for everyday business, school, legal, finance, and personal documents where you need a smaller PDF.
For very large files, close unused tabs and process one batch at a time so the browser has enough memory.

Common limitations

Encrypted or permission-restricted PDFs may need to be unlocked before processing.
Scanned pages, unusual fonts, complex layers, and damaged files can reduce accuracy or processing speed.
Browser memory and device performance matter more for local tools than for upload-based services.

Local processing vs upload-based tools

Local tools keep routine website processing on your device, while upload-based tools send files to a remote server.
Upload-based services can move heavy work off your computer, but they add transfer time and require trusting a server with your files.
Use the API when you intentionally need server-side automation; use the website when you want private manual processing.

What to do if processing fails

Try a smaller file, a shorter page range, or one file at a time if the browser runs out of memory.
If a PDF is encrypted, damaged, or restricted, unlock or repair it first and then retry the workflow.
If the output looks wrong, check whether the source file uses scans, complex transparency, form fields, or unsupported embedded objects.

API automation

Use API docs to plan automated PDF workflows. If this exact website workflow is not exposed as an endpoint yet, you can still use available PDF API tools and Credits for supported operations.

View API automation docs Create API Key

常见问题

可以减少多少文件大小？

压缩结果因PDF内容而异。图像密集的PDF通常可以减少50-80%，而纯文本PDF可能减少较少。

压缩会影响文本质量吗？

文本在所有压缩级别下都保持清晰可读。只有图像和图形会受到压缩影响。

可以一次压缩多个PDF吗？

是的，您可以同时上传和压缩最多10个PDF文件。