PDF 标注 - 在线免费添加文字、高亮与图章

上传您的 PDF，使用工具栏即可高亮文字、为段落添加下划线、添加便签、自由手绘、插入文本框、印章和箭头。一切都直接在您的浏览器中渲染——无需 Adobe Acrobat 授权，无需桌面安装——而且您带批注的 PDF 仍是真正的 PDF，能在预览、Acrobat Reader 和 Foxit 中正常打开。

可以。批注采用标准的 PDF 批注图层保存，因此审阅者、律师和客户在 Acrobat Reader、macOS 预览以及所有现代浏览器中看到的高亮和评论完全一致。它们也不是扁平化的图片——收件人可以用自己的 PDF 工具隐藏、回复或删除它们。

可以。拖入签名图片、输入风格化的签名，或使用绘制工具通过鼠标或触控设备手写你的名字。添加「已批准」「机密」和「草稿」印章以快速标注合同，并在对方期望的页边空白处放置签名缩写。

保存前开启“下载时拼合”选项，所有高亮、批注和签名都会被固化进页面位图中。拼合后的 PDF 非常适合最终交付——收件人可以阅读，但不会意外移动或删除您的批注。

Partly. Placing and editing annotations happens live in your browser, but exporting sends your PDF to our secure server over HTTPS to bake the annotations into the file — it is auto-deleted immediately after processing, and we never store, share, or sell it. If your workflow requires the file to never leave your device, use a desktop PDF editor instead.

可以。在侧边面板中浏览每一页，为扫描报告添加批注，并在纯图片 PDF 上叠加可搜索的文本框。扫描 PDF 会保持其原始版式，而你的批注位于透明覆盖层上，让底层的扫描件保持清晰。

选择文字工具，输入你的批注并选择颜色和大小，然后点击页面上的精确位置放置它（或点按“添加到页面”）。拖动即可重新定位，点按则可稍后编辑。批注会作为真实、可选中的文字写入 PDF，因此在下载文件中依然清晰且可搜索。

可以。切换到「高亮」工具，选择一种荧光笔颜色（黄、绿、蓝、粉等多种预设，或任意自定义颜色），然后在文字上拖出一条半透明色带。想加多少处高亮都行，每一处都可调整大小 — 非常适合标记合同中的条款或论文中的关键段落。

此工具会在页面上方叠加你自己的文字和高亮，并不会改写文档原有的文字。若要编辑原始内容，请使用「PDF 编辑器」工具，它可让你修改文件中已有的文字和元素。

The Stamp tool includes seven ready-made presets — APPROVED, CONFIDENTIAL, DRAFT, REVIEWED, PAID, URGENT and VOID — or you can type your own custom stamp text in the field below the presets. Pick any color for the stamp, click a spot on the page to place it, and it renders as a bold, bordered label baked into the exported PDF.

Select the annotation, then drag its corner handle to resize it — text and stamps scale their font size, while highlights stretch their width and height. On a touchscreen you can also pinch with two fingers directly on the annotation to scale it up or down.

Highlight the clauses that need attention using a bright preset color, add Text notes with your comments next to each one, then drop an APPROVED or REVIEWED stamp near the signature line before exporting. Combining all three tools on the same page gives reviewers a clear, at-a-glance markup.

Yes — the Pages panel shows an Annotations list with every text note, highlight and stamp you've placed, labelled by type and page number. Tap any entry to jump straight to that page with the annotation selected, which is handy once a long document has dozens of highlights and comments scattered across many pages.

Yes — select any text note, highlight or stamp on the page, then press Delete or Backspace to remove it instantly instead of reaching for the trash-can icon. This only works when an annotation is selected and you're not typing in a text field, so it won't accidentally delete something while you're editing a note.

已放置图章的文字无法直接编辑——图章放到页面上后，"编辑所选"面板只允许你更改它的颜色。若要修改文字内容，请用垃圾桶图标或 Delete 键删除该图章，然后在"图章"面板中选择正确的预设或输入新的自定义文字，再重新添加到页面上。