压缩 PDF
在保持品质的同时缩小 PDF 文件大小
File
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Original size
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Compressed
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上传一个 PDF 文件
拖放 PDF 文件或点击浏览
Compression Settings
Tips
Text in the PDF becomes images after compression.
Use 'Balanced' for most documents.
Custom mode gives you full control over quality.
使用方法
上传您的文件
拖放文件或点击浏览。您的文件留在浏览器中。
调整设置
配置选项以获得您所需的精确结果。
下载结果
即时处理并下载您的文件——无需等待，无需上传至服务器。
为什么使用此工具
100% 免费
没有隐藏费用，没有付费等级——所有功能完全免费。
无需安装
完全在浏览器中运行。无需下载或安装任何软件。
隐私且安全
您的数据永远不会离开您的设备。不会上传至任何服务器。
支持移动设备
完全响应式设计——在手机、平板或桌面电脑上均可使用。
您的文件保持私密
此工具完全在您的浏览器中处理文件。不会上传至任何服务器——您的数据永远不会离开您的设备。
- 无服务器上传——100% 客户端处理
- 不存储数据——关闭标签页时文件即被丢弃
- 无需账号——无需注册即可立即使用
How to Compress PDFs: Reduce File Size Without Losing Quality
Key Points
- Image-heavy PDFs benefit most from compression—text-only files are already small
- Compression reduces embedded image resolution and optimizes internal structure
- Browser-based compression means your documents never leave your device
Large PDF files are difficult to email, slow to upload, and consume storage space. PDF compression reduces file size by optimizing images and internal data structures. This is especially effective for scanned documents and image-heavy presentations, often reducing size by 50-80% with minimal visible quality loss.
50-80%
Typical file size reduction
Common Use Cases
Email Attachments
Most email services limit attachments to 25 MB. Compress oversized PDFs to fit within limits without needing cloud storage links.
Website & Portal Uploads
Government forms, university applications, and job portals often have strict file size limits. Compression helps meet these requirements.
Cloud Storage Optimization
Reduce storage costs by compressing archived documents. A 10 MB report compressed to 3 MB saves significant space across hundreds of files.
Faster Document Sharing
Compressed PDFs load and download faster, improving the experience for recipients on slower connections or mobile devices.
Compression Tips
Start with medium compression and check quality—you can always compress more if the result looks acceptable.
Scanned documents (image-based PDFs) compress much more than text-based PDFs.
If quality matters, keep the original file and use the compressed version only for sharing.
For presentations with high-res photos, compression can reduce file size dramatically with barely noticeable quality difference at screen resolution.
PDF compression is performed locally in your browser. No files are uploaded to any server. Compression is lossy for images—keep original files for archival purposes.