压缩 PDF
压缩 PDF 以减小文件大小，同时保持较高质量的视觉效果。非常适合电子邮件附件和网络上传。选择压缩级别 — 从最大压缩到最佳质量。处理完全在浏览器中完成。
Preparing the local PDF workspace
The instructions, FAQ, privacy notes, and related tools are already available while the browser-only editor initializes.
Practical guide for 压缩 PDF
Example use case
Reduce a 12 MB presentation PDF to a smaller attachment that fits an email limit while keeping text and charts readable.
Settings explained
- Higher compression usually makes smaller files but may reduce image quality.
- Documents made mostly of scanned images benefit more than text-only PDFs.
- Output size depends on the original images, fonts, and embedded objects.
Limitations
- Already-optimized PDFs may not shrink much further.
- Heavy compression can make photos or scans look softer.
- Some embedded objects cannot be reduced by browser-only compression.
Troubleshooting
- If the PDF is still too large, try a stronger compression level.
- If scans look blurry, use a lighter compression setting.
- If the file barely changes, the original PDF may already be optimized.
使用步骤
Upload a PDF
Choose the PDF file you want to make smaller.
Pick compression
Select a compression level that balances size and visual quality.
Download result
Review the reduced file size and download the optimized PDF.
常见问题
Why did my PDF not shrink?
Text-heavy or already-optimized PDFs often have little redundant data left to remove.
Does compression change the text?
The goal is to reduce size while keeping readable content, but always review important documents before sharing.
这个工具免费吗？
是的，这个工具完全免费使用。无需注册、没有限制、也无任何隐藏费用。所有处理均在浏览器中本地完成 — 绝不会上传任何内容。
我的文件安全吗？
你的文件永远不会离开你的设备。所有处理均在你的浏览器中使用客户端 JavaScript 本地完成。文件永远不会上传到任何服务器，你的隐私得到完全保护。
需要注册账号吗？
无需注册。你可以立即使用此工具，无需创建账号或提供任何个人信息。