图片加水印、批量水印与马赛克打码，一站搞定One tool for photo watermarking, batch watermarking and mosaic masking
上传身份证、银行卡、护照或任意图片，加「仅供办理XX使用」用途水印、Logo、手写签名、日期或二维码；卡号和住址用画笔涂抹或马赛克打码；一次可添加多张图片批量套用同一套水印，导出 JPG / PNG / WebP / PDF。全程在你浏览器里完成，不上传。Stamp “for XX only” text, a logo, your signature, a date or a QR code onto ID cards, bank cards and photos; paint or mosaic-blur card numbers and addresses; drop many images at once to batch-apply one watermark set, then export JPG / PNG / WebP / PDF. Everything runs in your browser - no uploads.
↑ 演示：为图片添加「仅供办理XX使用」用途水印后的效果；水印在浏览器本地添加，不上传。↑ Demo: an image stamped with a "for XX only" watermark - added locally in your browser, no uploads.
图片加水印、批量水印与马赛克打码，都在这里Photo watermarking, batch watermarking and mosaic masking in one place
图片加水印Watermark & mask
文字 / Logo / 签名 / 日期 / 二维码水印，多图层独立调节；马赛克打码与多图批量，导出 PNG / JPG / PDF。Text, logo, signature, date and QR watermarks with independent layers; mosaic masking and batch apply; export PNG / JPG / PDF.
立即使用使用教程How-to guide
从上传图片、添加水印到马赛克打码、批量导出，一步步图文教程，新手也能几分钟上手。Step-by-step guides from uploading and watermarking to mosaic masking and batch export - get started in minutes.
查看教程Read guide常见问题FAQ
图片是否上传、导出尺寸准不准、手机能不能用、如何保护隐私——先看这页快速答疑。Whether images are uploaded, if export sizes are accurate, phone support and privacy - quick answers here.
查看问答Read FAQ证件影像最敏感，所以我们不碰服务器ID images are sensitive - so no server ever sees them
页面下方常驻一条隐私状态栏：显示当前是否安全、距离自动清除还有多久，并提供「彻底清除」按钮。你也可以断网验证：所有处理都在本地完成。The privacy bar at the bottom shows the current status, the auto-clear countdown and an “Erase everything” button. You can even switch off your network to verify - all processing is local.
本地存储Stored locally
图片只在浏览器内存里，不写入服务器，也不写入 IndexedDB 或本地文件；没有上传请求，没有埋点收集图片内容。Images stay in browser memory only; nothing is written to a server, IndexedDB or local files; no upload requests, no analytics on your image content.
自动清除Auto-clear
页面切到后台或长时间无操作都会自动清除，关闭或刷新页面也会立即释放全部数据。Staying hidden in the background or leaving the page idle auto-clears everything; closing or reloading frees it all instantly.
一键彻底清除One-click full erase
清空内存图片与水印、回收对象链接，并清理本站在浏览器里留下的任何缓存、离线缓存与服务工作者。Clears in-memory images and watermarks, revokes object URLs and purges any browser cache, CacheStorage entries and service workers left by this site.
从上传到导出，只需三步From upload to export in three steps
上传或粘贴Upload or paste
支持拖拽、Ctrl+V 粘贴与手机相册选择；证件正反面可分别上传，多张图片一起处理。Drag, Ctrl+V paste or pick from your phone gallery; upload both sides of a card and process several files at once.
加水印与打码Watermark and mask
选用途模板（仅供办理XX使用、他用无效、日期），调字号与平铺密度；卡号、住址、人脸用马赛克或模糊遮住。Pick a purpose preset (for XX only, void elsewhere, date), tune size and tiling; then mosaic or blur the card number, address or face.
导出Export
一键导出 PNG / JPG / WebP / PDF，或调用浏览器打印，尺寸按你设定的毫米规格输出。One-tap export to PNG / JPG / WebP / PDF, or print from the browser - sized to the millimetre specs you set.
这些情况，真的建议先加水印再提交Cases where you should watermark before sending
办手机卡 / 银行卡SIM & bank applications
写明「仅供办理XX使用 他用无效」并加日期，斜向平铺压住背景。State the purpose plus “void elsewhere” and a date, tiled diagonally over the background.
入职与实名认证Onboarding & KYC
HR 与平台常留存复印件，用途水印能限定使用范围，也便于事后追责。Copies get archived; a purpose watermark limits the allowed use and helps later accountability.
房屋租赁 / 买卖Rentals & deals
中介链条长、留存多，务必加「仅供租房核验使用」并打码无关信息。Agents share files widely - add “for rental check only” and mask irrelevant data.
报名与考试Exam sign-ups
报名表要求按像素尺寸上传证件，可先用裁剪按系统要求的宽高比裁好再上传，避免被退回。Crop your document to the exact pixel ratio the form requires before uploading, so the system does not reject it.
原创图片防盗Protecting your photos
半透明斜向平铺 + 版权文字或 Logo，让盗图者难以裁掉。A translucent diagonal tile with a copyright note or logo is hard to crop out.
聊天与订单截图Chat & order screenshots
头像、昵称、手机号、收货地址用涂抹打码，比矩形框更自然。Paint over avatars, nicknames, phone numbers and addresses - it looks cleaner than a box.
合同与内部文件Contracts & internal files
「内部资料 请勿外传」+ 签署人签名 + 时间戳，一页搞定。“Internal use only”, a signature and a timestamp on one page.
导出Export
导出 PNG / JPG / WebP / PDF，尺寸与原始图像一致，方便后续打印或上传。Export to PNG / JPG / WebP / PDF at the original image size, ready to print or upload.
先问清楚的几件事The first things people ask
图片会被上传吗？Do you upload my images?
不会。全部处理在浏览器 Canvas 里完成，页面也没有任何上传接口，断网也能用。No. Everything happens in browser Canvas with no upload endpoint at all - it keeps working offline.
免费吗？会加你们的水印吗？Is it free? Do you add your own logo?
免费、无次数限制，也不会偷偷加官方角标或压缩画质。Free and unlimited, and we never inject a logo or silently compress your output.
导出尺寸准吗？Is the exported size accurate?
水印在原始像素上合成，导出 JPG / PNG 保持原图尺寸，PDF 用磅值精确输出；需要打印时选择「实际大小 / 无边距」并关闭「适合页面」即可。Watermarks are composited on the original pixels, so JPG / PNG keep the source size and the PDF is exact to the point - just print at “Actual size / no margins”.
手机能用吗？Does it work on phones?
可以。移动端为触控优化：面板自动堆叠、按钮不小于 40px、支持相册选图与长按粘贴。Yes - panels stack, touch targets stay 40px+, and you can pick from the gallery or long-press to paste.