PDF Compressor | 72Tool Free Online PDF Tool

PDF Compressor — a free online PDF Tools tool. Runs entirely in your browser, no upload, no registration, works on phone and desktop.

PDF Compressor is a free online tool in the 72Tool toolbox for PDF tasks. Enter your input to get instant, accurate results — handy for work, development and daily use.

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PDF Compressor

PDF压缩是一款免费的在线PDF 处理与格式转换工具，无需下载安装、无需注册登录，打开网页即可使用。支持PDF压缩，所有压缩操作均在浏览器本地完成，文件不会上传到服务器，充分保护数据隐私。无论使用电脑、平板还是手机，都能直接在浏览器中打开使用。

PDF压缩适用于文档整理归档、合同合并拆分等场景，支持合并、拆分、压缩、格式转换等常见 PDF 处理需求。作为一款轻量的在线PDF 处理与格式转换工具，它免去了安装专业软件的麻烦，随开随用，是日常文档整理归档中的实用小工具。

使用教程
  1. 点击上传区域，选择本地的文件（支持页面提示的格式）。
  2. 按需设置处理参数：从下拉菜单选择参数（如：高压缩 体积最小、均衡压缩 画质适中、轻度压缩 高清保留）。
  3. 可在压缩档位中选择合适的强度，平衡文件体积与清晰度。
  4. 点击「开始压缩并下载」按钮，等待浏览器在本地完成处理。
  5. 处理完成后自动下载结果文件，或在本页结果区查看预览。
常见问题
Q1：合并顺序怎么定？
A：按你选择文件的顺序合并，注意上传时的先后。
Q2：需要至少几个文件？
A：多数操作需 2 个及以上，单文件工具另计。
Q3：文件安全吗？
A：本地处理，不上传服务器。
Q4：大文件处理慢？
A：PDF 解析依赖本地算力，文件越大越慢。
Q5：PDF压缩支持PDF格式吗？
A：支持，可直接上传PDF文件，在浏览器本地完成压缩，文件不会上传到服务器。
Q6：PDF压缩可以在手机上使用吗？
A：可以，本工具基于网页运行，手机、平板、电脑均可直接打开网页使用，无需安装 App。
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Features & Use Cases

PDF Compressor is a free online PDF Tools tool. No download or registration is required — just open the page and use it instantly. All processing runs locally in your browser, so your files and data never leave your device, keeping everything private.

How to Use
  1. Enter or paste the content you want to process into the input area.
  2. Set any options you need (such as units or modes) from the controls on the page.
  3. Click the action button and let the tool process everything locally in your browser.
  4. View the result, then copy or download it as needed.
FAQ
Q：Is the result accurate?
A：It uses standard algorithms and conversion factors, accurate enough for everyday and work use.
Q：What file formats are supported?
A：Popular formats are supported; check the options and notes on the page.
Q：Can I use it on my phone?
A：Yes. It runs in any modern browser on phone, tablet, or desktop — no app install needed.
Q：Is it really free?
A：Yes, this tool is completely free to use, with no login required.
Related Tools
Add Page Numbers to PDF Extract Images from PDF Edit PDF Metadata Replace PDF Text Sign PDF (Text) PDF Table to CSV PDF Table to Excel PDF to Image

Note: PDF Compressor runs entirely in your browser; your data is not uploaded to any server. Explore more free online tools on the 72Tool homepage.