🧱 PDF 扁平化Flatten PDF
把 PDF 表单字段的填写内容固定到页面上、不可再编辑；或整页栅格化，把批注、印章、签名图层全部合并为图片，防止被修改或在不同阅读器里显示不一致。Flatten a PDF: bake filled-in form fields into the page so they can no longer be edited, or rasterize every page to merge annotations, stamps and signature layers into the image — preventing edits and display differences between viewers.
使用说明与常见问题How-to & FAQ
「PDF 扁平化」是什么？What is the Flatten PDF tool?
把 PDF 表单字段的填写内容固定到页面上、不可再编辑；或整页栅格化，把批注、印章、签名图层全部合并为图片，防止被修改或在不同阅读器里显示不一致。Flatten a PDF: bake filled-in form fields into the page so they can no longer be edited, or rasterize every page to merge annotations, stamps and signature layers into the image — preventing edits and display differences between viewers.
如何使用「PDF 扁平化」？How do I use the Flatten PDF tool?
在「PDF 扁平化」中，按需设置「方式」、「分辨率」、「JPG 质量 (1–100)」等选项，然后点击「扁平化并下载」按钮即可。支持拖放文件。加密的 PDF 选好后会先出现「打开密码」栏和「打开」按钮，输入密码点「打开」后再继续。In the Flatten PDF: Set "Mode", "Resolution", "JPG quality (1–100)", then click "Flatten & download". Drag-and-drop files is supported. For an encrypted PDF, a Password field and an Open button appear after you choose it — enter the password and click Open first.
“扁平化”是什么意思？What does flattening mean?
可填写表单里的文字框、勾选框原本是可编辑的交互字段；扁平化后，填写的内容变成页面上的普通文字和图形，任何人都不能再修改，也不会因阅读器不同而显示不一致。Form text boxes and checkboxes are interactive, editable fields. Flattening turns their values into ordinary page content that nobody can change and that looks the same in every viewer.
两种方式怎么选？Which mode should I choose?
“合并表单字段”只处理表单，文字仍是矢量、可搜索复制，文件小；“整页栅格化”把每页渲染成图片，批注、印章、手写签名等全部合并，但文字不能再选择或搜索，文件通常更大。Flatten form fields only touches the form: text stays vector, searchable and small. Rasterize renders each page to an image so annotations, stamps and handwritten signatures are merged too, but text is no longer selectable or searchable and files are usually larger.
中文表单内容会乱码吗？Will Chinese form values break?
合并表单时会优先使用字段已有的外观；如果字段外观缺失且内容无法用标准字体重绘，请改用“整页栅格化”，它按阅读器显示效果原样渲染。Existing field appearances are used when flattening. If an appearance is missing and can't be redrawn with standard fonts, use Rasterize pages, which renders exactly what a viewer shows.
加密的 PDF 可以处理吗？Can it handle password-protected PDFs?
可以。如果 PDF 需要打开密码，会提示你输入；只有权限限制（无打开密码）的文件会自动打开。输出文件不再带密码，如需加密请使用“PDF 加密”工具。Yes. If the PDF needs an open password you'll be asked for it; files with only permission restrictions open automatically. The output is not password-protected — use the Protect PDF tool if needed.
文件会上传到服务器吗？Are my files uploaded?
不会。PDF 在你的浏览器里用 pdf-lib / pdf.js 处理，文件不会离开你的设备，关闭页面后不留存任何数据。No. The PDF is processed in your browser with pdf-lib / pdf.js; files never leave your device and nothing is kept after you close the page.
「PDF 扁平化」免费吗？需要注册吗？Is the Flatten PDF free? Do I need an account?
「PDF 扁平化」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Flatten PDF is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.