線上壓縮PDF

减小PDF檔案大小同时保持品質。免費線上PDF壓縮器，生成更小的檔案。

上傳PDF檔案

拖放PDF檔案到此處。一次最多可壓縮10個檔案。

Files: 10

關於此工具

壓縮PDF在保持可接受品質的同时减小PDF文件的檔案大小。这对于电子邮件附件、網路上傳或节省存储空间至关重要。

该工具提供多种壓縮级别，以平衡檔案大小减少和品質保持。您可以選擇激进壓縮以获得最大的大小减少，或選擇轻度壓縮以保持更高的品質。

所有壓縮都在您的瀏覽器中进行，确保您的文件永远不会离开您的设备。

使用方法

上傳PDF檔案
拖放您的PDF檔案或點選選擇要壓縮的文件。
選擇壓縮级别
選擇您偏好的壓縮级别：低（最佳品質）、中（平衡）或高（最小檔案）。
壓縮并下載
點選壓縮以减小檔案大小，然后下載优化后的PDF。

使用場景

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。

網路发布

优化PDF以供網路下載，提高頁面加载时间和用户体验。

存储优化

壓縮存档文件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

常見問題

可以减少多少檔案大小？

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

壓縮会影响文本品質吗？

文本在所有壓縮级别下都保持清晰可读。只有影像和图形会受到壓縮影响。

可以一次壓縮多个PDF吗？

是的，您可以同时上傳和壓縮最多10个PDF檔案。