打开 PDFnoted 网页版（无需安装），拖入需压平的 PDF 文件。支持带可填字段（如姓名、日期）、高亮/文本框批注的文档。确认所有内容已正确加载并可见。
在右侧操作栏找到「扁平化」按钮（图标为压平图层），点击后 PDFnoted 会将所有表单字段值、自由文本、高亮、下划线、手写批注等永久渲染为页面图像级内容——即‘烤死’，不再可选、不可编辑、不响应鼠标交互。
下载生成的 PDF 后，用任意阅读器（如系统预览、Edge 或 Chrome）打开：尝试选中文本、点击原表单域、右键复制批注——均应失效。若仍可编辑，说明未成功压平，请返回 PDFnoted 重新执行，勿跳过「确认压平」弹窗。
Open PDFnoted’s web app (no install needed), then drag & drop your PDF containing fillable fields (e.g., Name, Date) or annotations (highlight, text boxes). Verify all elements render correctly before proceeding.
Locate the 'Flatten' button (layer-flattening icon) in the right toolbar and click it. PDFnoted instantly renders all form field values, typed text, highlights, underlines, and ink annotations as fixed page content — truly 'burned in', no longer selectable or editable.
After downloading, open the result in any PDF reader (Preview, Edge, Chrome). Try selecting text, clicking former form fields, or copying annotations — none should work. If editing remains possible, re-run flattening in PDFnoted and ensure you confirm the 'Flatten Now' dialog — skipping it causes partial flattening.
不能。PDFnoted 的扁平化是不可逆操作：所有内容转为像素级固定图层，原始文本、表单、矢量批注全部消失，仅保留视觉呈现。请务必先备份原始 PDF。
这是因签名以低分辨率位图嵌入所致。PDFnoted 默认按 300 DPI 渲染，但若原始签名图质量差或缩放过度，会失真。建议使用矢量签名（如 PDFnoted 内置手写签名工具）或导入高清 PNG（≥600×300 px）再压平。
不能。扁平化 ≠ 删除。它只将‘可交互元素’（表单、批注、浮动文本）固化为页面一部分，但水印、页眉页脚、底图等静态内容本就不可编辑，不受影响。如需删水印，请单独使用 PDFnoted 的‘移除背景’功能。
No. PDFnoted’s flattening is irreversible: all content becomes pixel-locked page layers. Original text, form fields, and vector annotations are permanently removed — only their visual appearance remains. Always keep a backup of the source PDF.
Blur occurs when signatures are embedded as low-res bitmaps. PDFnoted renders at 300 DPI by default, but poor-quality or overscaled images degrade. Use vector signatures (via PDFnoted’s built-in pen tool) or import high-res PNGs (≥600×300 px) before flattening.
No. Flattening ≠ removal. It only cements interactive elements (forms, annotations, floating text) into the page. Static elements like watermarks, headers, or background images remain untouched — they’re already non-interactive. To remove watermarks, use PDFnoted’s dedicated 'Remove Background' tool instead.