DocMask
100% local · 14-day free trial · ¥199 one-time 100% 本地 · 14 天免费试用 · ¥199 一次性买断

Redact your documents before AI sees them. 把敏感信息先脱敏再交给 AI

DocMask is a local-first desktop tool that swaps personal data in Word, Excel, and legacy .doc / .xls files with reversible aliases — before you paste or upload to ChatGPT, Claude or Copilot. Keep an encrypted mapping locally and one-click restore the AI's answer back to the real values. DocMask 是一款在本机运行的桌面工具:把 Word / Excel(包括旧版 .doc / .xls)里的个人信息替换成可逆别名,再交给 ChatGPT、Claude、Copilot 等 AI。映射表在本机加密保存,AI 回答里的别名一键还原为真实值。

No telemetry, ever 无任何遥测 Works offline 可离线使用 AES-256 encrypted vault AES-256 加密 vault
What makes DocMask different
它凭什么不一样

Built for the AI era, not the 2015 compliance era.

为 AI 时代而生,不是 2015 年的合规产物。

Most "redaction" tools delete data. DocMask lets you reverse it. Send the AI a scrubbed copy, get back a useful answer, then stitch the real names, phone numbers and IDs back in — all locally.

大多数"脱敏"工具只会抹掉数据。DocMask 还支持还原:把清洗过的文档发给 AI,拿到回答后再把人名、电话、身份证号拼回去——全程本地。

🔒

Local-first, never phones home

本地优先,不联网

No cloud, no telemetry, no accounts. The only network calls are an optional update check and a periodic licence-key check (key + hashed device fingerprint, no document content). Unplug your cable — DocMask still redacts.

没有云、没有遥测、没有账号。应用唯一的网络请求是更新检查(可关)和周期性的许可校验(仅传密钥与设备指纹哈希,不含文档内容)。拔掉网线也能脱敏。

↩︎

Reversible by design

天生可逆

Aliases (Person A, Phone B) preserve readability so the AI's answer still makes sense. Paste the answer back, DocMask restores the real values in one click.

别名(人物 A电话 B)让 AI 的回答仍然可读。把回答粘回 DocMask,一键还原成真实值。

📄

Word, Excel, and legacy .doc / .xls

Word、Excel,包含旧版 .doc / .xls

Native .docx / .xlsx editing preserves fonts, tables, formulas, headers and footers. Legacy .doc / .xls auto-convert via MS Office, WPS or LibreOffice on your machine.

原生处理 .docx / .xlsx,字体、表格、公式、页眉页脚一个不动。旧版 .doc / .xls 自动走本机 Office / WPS / LibreOffice 转换。

🧩

Templates for recurring work

模板化的重复工作流

Save a rule set + keyword list once. Reuse across every HR, finance or audit document. Aliases stay consistent across runs.

把规则和关键词存成模板,HR、财务、审计的同类文档一键套用,别名在多次脱敏之间保持一致。

📦

Batch mode for folders

文件夹级批量处理

Drop a folder, get a zipped bundle: every redacted file, a merged mapping, and a CSV report. The same name gets the same alias across every file in the batch.

选一个文件夹,输出一个压缩包:所有脱敏文件 + 合并映射表 + CSV 报告。跨文件的同一个原值始终对应同一个别名。

🌐

12+ PII rules out of the box

开箱 12+ 条 PII 规则

Built-in: CN ID / mobile / bank card / landline, US SSN / EIN / phone, EU IBAN, Luhn-checked Visa/MC/Amex, email, IPv4. Bring your own regex and keywords too.

内置:中国身份证 / 手机 / 银行卡 / 固话,美国 SSN / EIN / 电话,欧盟 IBAN,带 Luhn 校验的 Visa/MC/Amex,邮箱、IPv4。也可自定义规则和关键词。

The DocMask loop
三步闭环

Three steps between you and a safe AI prompt.

三步搞定"安全地喂 AI"。

1

Redact locally

本地脱敏

Import a Word or Excel file. DocMask highlights every name, phone, ID, IBAN, credit card and custom keyword. Pick what to replace.

导入 Word / Excel,DocMask 自动标出每个人名、电话、身份证、IBAN、信用卡和你自定义的关键词。挑选要替换的。

2

Prompt freely

放心送进 AI

Send the redacted file (or copy its text) to ChatGPT, Claude, Copilot — any LLM. Aliases are readable so the AI's reasoning stays intact.

把脱敏后的文档或文本发给 ChatGPT / Claude / Copilot 任意一家。别名保持可读,AI 推理不受影响。

3

Restore with one click

一键还原

Paste the AI's answer into DocMask. Using your locally encrypted mapping, aliases turn back into real values. The mapping never leaves your machine.

把 AI 的回答粘回 DocMask,借助本机加密的映射表,别名自动变回真实值。映射表永远不离开你的电脑。

By the numbers 量化事实

Measurable privacy, not marketing privacy.

可量化的隐私,不是营销话术。

0
Outbound data packets
对外数据包
AES-256
GCM-encrypted mapping vault
GCM 加密映射表
12+
Built-in PII rules
内置 PII 规则
7 days
No-questions-asked refund
无理由退款
Pricing
价格

Try free for 14 days, then own it forever.

14 天免费试用,再决定一次性买断。

One desktop tool, three ways to get started. No subscriptions, no usage caps after purchase.

一个工具,三种上手姿势。买断之后无订阅、无文档数量上限。

14-day Trial 14 天试用
Free 免费
No credit card · No account 无需绑卡 · 无需注册
  • All redaction features unlocked所有脱敏能力全开
  • Up to 50 documents per day每天最多 50 个文档
  • Word, Excel, .doc, .xls支持 Word / Excel / 旧版 .doc / .xls
  • Email support邮件支持
Download trial 下载试用版
Business 企业版
Custom 面议
3+ devices · Volume licence · Invoice 3 台以上 · 批量许可 · 开发票
  • Everything in Personal包含个人版所有能力
  • Multi-device, multi-seat licence多设备、多席位授权
  • Dedicated WeChat / email support专属微信群 / 邮件支持
  • Contract & invoice (CN VAT) supported合同与增值税普票/专票
Contact sales 联系销售

Prices in CNY. International cards welcome — at checkout, we accept WeChat Pay, Alipay, Visa, Mastercard and Amex. Educational and non-profit discount: email hi@docmask.app. 价格以人民币计。结算页支持微信支付、支付宝、Visa、Mastercard、Amex。教育用户、非营利组织优惠请邮件 hi@docmask.app

FAQ
常见问题

Questions you'd ask a paranoid friend.

你最想问一个偏执的朋友的问题。

Is my data sent anywhere? 我的数据会被发到外部吗?
No. Document content, mapping tables and any user-generated content stay on your device. The only outbound calls are: (1) an optional update check, and (2) a periodic licence-key check that transmits only your key and a hashed device fingerprint — never document content. You can verify with netstat / a packet sniffer, or just disconnect your network and confirm redaction still works. 不会。文档内容、映射表和任何用户生成内容都不离开你的电脑。对外的网络请求只有两条:(1) 检查更新(可关),(2) 周期性许可校验——只发送你的密钥和设备指纹哈希,绝不上传文档内容。你可以用 netstat 或抓包工具验证,或者直接断网,脱敏功能照样能跑。
How is this different from Microsoft Presidio? 和 Microsoft Presidio 有什么区别?
Presidio is a Python library for developers. DocMask is an end-user desktop app built on Tauri + a Python sidecar, with stricter Office format support (Word/Excel/.doc/.xls) and an encrypted local mapping vault — so you can restore the AI's answer, not just delete sensitive data. Presidio 是给开发者用的 Python 库。DocMask 是一个直接面向普通用户的桌面应用,基于 Tauri + Python sidecar,对 Office 格式(Word/Excel/.doc/.xls)的支持更完整,并且有本地加密的映射表可以还原,而不只是删除。
Will the AI still give me a useful answer? 脱敏后 AI 的回答还可用吗?
Yes. Aliases are chosen to keep sentences readable: Person A / B, Phone A, ID A. Modern LLMs handle them transparently — in internal testing, answers are indistinguishable in quality from non-redacted prompts on the same task. 可以。别名刻意选择了"保持可读"的形式:人物 A / B电话 A证件 A。现代 LLM 处理这种别名很自然,在我们的测试中,回答质量与未脱敏几乎没差别。
Does redaction preserve formatting? 脱敏会破坏文档格式吗?
Yes. DocMask edits .docx / .xlsx at the XML level — fonts, tables, headers, footers, formulas all stay intact. Legacy .doc / .xls are first auto-converted via Microsoft Office, WPS, or LibreOffice, then edited as .docx / .xlsx. 不会。DocMask 直接在 .docx / .xlsx 的 XML 层改写,字体、表格、页眉页脚、公式都原样保留。旧版 .doc / .xls 会先经 Microsoft Office / WPS / LibreOffice 转换,再按新格式处理。
macOS / Linux support? 支持 macOS / Linux 吗?
Windows is the launch target. The Tauri stack and our Python sidecar both work on macOS and Linux, so those builds are a natural follow-up. Email hi@docmask.app to vote on platform priorities. 首发仅 Windows。Tauri 技术栈和 Python sidecar 在 macOS / Linux 上都能跑,这些版本会在首发之后陆续做。想要优先支持的朋友请发邮件到 hi@docmask.app 投票。
How much does it cost? 多少钱?
14-day free trial with full functionality, no credit card. After the trial, ¥199 (about USD 28) for a one-time personal licence on 1 device — yours forever, including all minor and patch updates within the same major version. Multi-device or business licences: contact sales below. Full 7-day no-questions-asked refund. 14 天免费试用,所有功能都开放,无需绑卡。试用结束后,个人版 ¥199 一次性买断(1 设备),同主版本号内所有次要版本和补丁都免费升级,永久使用。多设备或企业批量授权请联系销售。7 天无理由全额退款。
What if my purchase doesn't work? 买了用不了怎么办?
7 days, full refund, no questions asked. Email hi@docmask.app with your order number — we issue refunds within 24 hours. 7 天内全额退款,无需理由。把订单号发邮件到 hi@docmask.app,24 小时内退到原账户。

Start redacting locally in under 2 minutes.

两分钟内,在本机开始脱敏。

Windows MSI + NSIS installer · ~30 MB · 14-day free trial · 7-day refund

Windows MSI / NSIS 安装包 · 约 30 MB · 14 天免费试用 · 7 天无理由退款