在PDFnoted中打开待处理PDF → 使用【红框遮盖】工具精准覆盖敏感内容（如身份证号、联系方式）→ 点击右上角【应用遮盖】确保所有标记已永久移除文本层。
点击顶部菜单栏【文件】→ 选择【压平文档】（Flatten Document）→ 勾选‘合并所有图层’与‘移除交互元素’两项（默认开启），确保表单域、注释、高亮均被不可逆嵌入。
PDFnoted将自动预览压平效果（原可编辑区域变为纯图像/文本块）→ 点击【导出为PDF】→ 建议命名含‘_flattened_final’后缀，避免与原始文件混淆。
Open your PDF in PDFnoted → Use the ‘Redact’ tool (red rectangle) to precisely cover sensitive data (e.g., ID numbers, phone numbers) → Click ‘Apply Redactions’ in the top-right corner to permanently remove underlying text.
Go to File → Select ‘Flatten Document’ → Check both ‘Merge All Layers’ and ‘Remove Interactive Elements’ (enabled by default) to irreversibly bake in form fields, comments, highlights, and annotations.
PDFnoted previews the flattened result (editable areas become static text/image blocks) → Click ‘Export as PDF’ → Name the file with ‘_flattened_final’ to distinguish it from source drafts.
不能。PDFnoted的扁平化是不可逆操作——所有文字、表单和批注均被渲染为页面底层像素或矢量图形，不再保留任何可选、可复制或可修改属性。
因PDFnoted将交互对象（如表单域）转为静态图形，并可能嵌入字体子集或栅格化复杂注释；这是安全定稿的必要代价，不影响阅读与打印。
不能完全阻止截图，但可杜绝文本复制、OCR识别与字段恢复。压平后截图仍是唯一风险点，建议配合权限控制（如禁用打印/复制）使用PDFnoted高级设置。
No. PDFnoted’s flatten is irreversible: all text, form fields, and annotations are rendered into the page’s base layer (as vector paths or rasterized content), losing selection, copy, and edit capability permanently.
Flattening converts interactive objects (e.g., form fields) into static graphics and may embed font subsets or rasterize complex annotations—this trade-off ensures security and visual fidelity, with no impact on viewing or printing.
Flattening doesn’t block screenshots—but it eliminates text copying, OCR extraction, and field restoration. For full protection, combine flattening with PDFnoted’s permission settings (e.g., disable copy/print) before exporting.