How to Redact PDF, Word & Excel 如何脱敏 PDF、Word 和 Excel 文档
Remove names, emails, phone numbers and other PII — entirely on your machine, before pasting into AI 删除姓名、邮箱、电话等个人信息 — 完全在本地完成，粘贴到 AI 之前
Supported Formats
支持的文件格式
3 Steps to Redact Any Document
3 步脱敏任何文档
Open Your Document
打开文档
Launch DocMask and drag your PDF, Word or Excel file into the app. Your file stays on your machine — nothing is uploaded to any server. DocMask works completely offline.
启动 DocMask，将 PDF、Word 或 Excel 文件拖入应用。文件始终留在您的设备上 — 不会上传到任何服务器。DocMask 完全离线运行。
Review Detected PII
检查检测到的个人信息
DocMask automatically detects names, email addresses, phone numbers, addresses and other sensitive fields. Review the side-by-side preview — original on the left, redacted version on the right. Toggle individual items on or off, or adjust the alias for each entity.
DocMask 自动检测姓名、邮箱地址、电话号码、地址及其他敏感字段。查看并排预览 — 左侧为原文，右侧为脱敏版本。可以单独开关每个条目，或调整每个实体的别名。
Export or Paste into AI
导出或粘贴到 AI
Export the redacted document as a new file, or copy-paste the redacted text into ChatGPT, Claude or Copilot. After the AI responds using aliases like "Person_A", use DocMask's reverse-mapping to restore real names in the AI's answer — without the AI ever seeing the real data.
将脱敏文档导出为新文件，或将脱敏文本复制粘贴到 ChatGPT、Claude 或 Copilot。AI 使用 "Person_A" 等别名回答后，使用 DocMask 的反向映射将 AI 回答中的别名还原为真实姓名 — AI 全程未接触真实数据。
Why Local Redaction Matters
为什么本地脱敏很重要
Key insight: Online PDF tools upload your file to a server for processing. Even with "files deleted in 2 hours" policies, your sensitive data has already left your device and traversed the internet. For legal, medical or financial documents, that's often a compliance violation.
关键洞察：在线 PDF 工具会将文件上传到服务器处理。即使有 "2 小时后删除" 的策略，您的敏感数据已经离开设备并传输到互联网。对于法律、医疗或财务文档，这通常构成合规违规。
- Zero network traffic — DocMask makes zero outbound HTTP requests. Verify with DevTools → Network.
- 零网络流量 — DocMask 不发出任何 HTTP 请求。可用 DevTools → Network 验证。
- GDPR / HIPAA compatible — data never leaves the device, so there's no data transfer to regulate.
- 兼容 GDPR / HIPAA — 数据从不离开设备，因此无需监管数据传输。
- AES-256 encrypted mapping — the alias↔real name mapping is encrypted locally, never stored in plaintext.
- AES-256 加密映射 — 别名↔真实姓名的映射在本地加密，从不以明文存储。
- Reversible — unlike Adobe Acrobat or Foxit, DocMask redaction is reversible so the AI's answer maps back to real names.
- 可逆 — 不同于 Adobe Acrobat 或 Foxit，DocMask 的脱敏是可逆的，AI 的回答可以映射回真实姓名。
Common Use Cases
常见使用场景
Redact PDF before sending to ChatGPT
发送到 ChatGPT 前脱敏 PDF
Open the contract in DocMask → review detected names and addresses → copy redacted text → paste into ChatGPT → get the AI's analysis → use reverse-mapping to restore names in the answer. The AI analyzed your document without ever seeing real personal data.
在 DocMask 中打开合同 → 检查检测到的姓名和地址 → 复制脱敏文本 → 粘贴到 ChatGPT → 获取 AI 分析 → 使用反向映射还原回答中的姓名。AI 在完全未接触真实个人数据的情况下分析了您的文档。
Redact Word document for external review
为外部审查脱敏 Word 文档
Before sharing a .docx with an external auditor or partner, run it through DocMask to remove employee names, client details, and internal identifiers. Export the clean version and share confidently.
在将 .docx 文件分享给外部审计师或合作伙伴之前，通过 DocMask 移除员工姓名、客户详情和内部标识。导出干净版本并放心分享。
Redact Excel spreadsheet with customer data
脱敏包含客户数据的 Excel 表格
Customer lists, HR records, financial reports — Excel files often contain dense PII across hundreds of rows. DocMask handles .xlsx and legacy .xls, detecting PII in cells, headers and comments.
客户名单、人力资源记录、财务报告 — Excel 文件通常在数百行中包含大量个人信息。DocMask 处理 .xlsx 和旧版 .xls，检测单元格、标题和批注中的个人信息。
Frequently Asked Questions
常见问题
How do I redact a PDF for free? 如何免费脱敏 PDF？
Download DocMask (free 14-day trial, no credit card). Open the PDF, review detected PII in the side-by-side preview, then export the redacted file. Everything runs locally — your file never leaves your machine.
下载 DocMask（14 天免费试用，无需信用卡）。打开 PDF，在并排预览中检查检测到的个人信息，然后导出脱敏文件。一切在本地运行 — 文件从不离开您的设备。
Can I redact Word and Excel files, not just PDF? 不仅是 PDF，我能脱敏 Word 和 Excel 吗？
Yes. DocMask supports PDF, Word (.docx, .doc), and Excel (.xlsx, .xls). It handles both modern Office formats and legacy formats from Office 2003 and earlier.
可以。DocMask 支持 PDF、Word（.docx、.doc）和 Excel（.xlsx、.xls）。同时支持现代 Office 格式和 Office 2003 及更早的旧版格式。
Is online PDF redaction safe? 在线 PDF 脱敏安全吗？
Online tools upload your file to a server for processing. Even with "files deleted in 2 hours" policies, your sensitive data has already left your device. For truly sensitive documents (legal, medical, financial), use a local tool like DocMask where files never leave your machine.
在线工具会将文件上传到服务器处理。即使有 "2 小时后删除" 的策略，您的敏感数据已经离开了设备。对于真正敏感的文档（法律、医疗、财务），请使用像 DocMask 这样的本地工具，文件从不离开您的设备。
What is reversible redaction? 什么是可逆脱敏？
Reversible redaction replaces real names with consistent aliases (e.g., "John Smith" → "Person_A") using an AES-256 encrypted local mapping. After an AI like ChatGPT processes the redacted text, you can restore "Person_A" back to "John Smith" in the AI's response. Traditional redaction (Adobe Acrobat, Foxit) permanently deletes the original text.
可逆脱敏使用 AES-256 加密的本地映射将真实姓名替换为一致的别名（如 "张三" → "Person_A"）。AI（如 ChatGPT）处理脱敏文本后，您可以在 AI 的回答中将 "Person_A" 还原为 "张三"。传统脱敏（Adobe Acrobat、Foxit）会永久删除原始文本。
How to redact a PDF before sending to ChatGPT? 发送到 ChatGPT 前如何脱敏 PDF？
Open the document in DocMask → review detected PII → copy the redacted text → paste into ChatGPT. When ChatGPT responds with aliases like "Person_A", use DocMask's reverse-mapping to restore real names. The AI never sees real personal data.
在 DocMask 中打开文档 → 检查检测到的个人信息 → 复制脱敏文本 → 粘贴到 ChatGPT。当 ChatGPT 使用 "Person_A" 等别名回答时，使用 DocMask 的反向映射还原真实姓名。AI 全程未接触真实个人数据。