Remove PDF password
Use a password you already know to save an encrypted PDF as a copy that needs none (text layer preserved)
先说清楚:这不是「破解密码」
本工具只解密你自己提供密码的文件:密码由你填写,正确才转换,错误就直接报错。 我们不做任何猜测、字典或暴力尝试,也不提供「绕过密码」的能力—— 如果你不知道这份 PDF 的密码,本页帮不了你,请找文件的提供方要密码。 适用于:自己给文件设了密码、每次打开都嫌麻烦;从老系统导出的自家文件被限制了编辑/打印;给同事传文件前先去掉密码。
为什么这个工具要上传文件?密码会被记录吗?
本站其它工具都在你的浏览器里本地处理、文件不出本机;但解密 PDF(AES/RC4 全谱)需要成熟的 qpdf 引擎,浏览器里做不到同等覆盖,所以它是本站少数需要上传的工具之一。 上传的文件只用于这一次转换:不写入数据库、不留存在服务器(转换完成立即删除)、不上传到任何第三方。 密码同样只用于这一次解密:不写入数据库、不写进日志(服务端日志只记密码长度)、不用于其它任何用途,处理完随临时目录一起删除。 若文件敏感到「连转换服务都不能经手」,请在本地用 Adobe Acrobat / WPS 的「权限 → 安全性 → 无安全性」另存一份。
把加密的 .pdf 文件拖到这里,或点击选择
支持 AES-256 / AES-128 / RC4 加密的 PDF;单文件不超过 20MB
密码只用于这一次解密:不入库、不写日志、不留存。最多 128 个字符。
提示:常见文件几秒完成,几百页或含大量图片时最长约一分半钟。转换完会自动下载一份新文件,原文件不会被改动。
PDF 去密码的适用场景与效果边界
两种「密码」要分清。一种要你在打开时输入密码(user password,真正的加密);另一种文件能直接打开,但被限制了编辑、打印、复制、填表(只有 owner 密码的权限加密)。本页两种都能处理:第一种需要你填密码,第二种密码留空即可。成功后会如实告诉你去掉的是哪一种。
产物是什么样。去密码后的副本与原文件内容一致:文字层与矢量图形都保留(可以继续搜索、复制、缩放不糊),不是逐页截图重排。文件体积可能有小幅变化(qpdf 会重新规范化对象与交叉引用表),也可能因去掉了加密开销而略小。
本页不做的事。不猜测、不穷举、不绕过密码(不知道密码就没有任何办法);不解锁受 DRM 保护的内容;不改动文件里的文字与版式。若你要的是「PDF 转 Word / Excel」或「压缩体积」,请用站内对应工具。
限制与隐私。单文件上限 20MB、密码最多 128 个字符;带打开密码的文件必须先填对密码。文件与密码都只用于这一次转换——不写入数据库、不留存服务器(转换完成立即删除)、不上传到任何第三方;服务端日志只记文件字节数与密码长度,绝不记录密码内容。
FAQ
The file is uploaded, but only for this one conversion: deleted the moment it finishes, not written to any database, not retained, never sent to any third party. The password serves only this one decryption - not written to any database, not written to logs (the server log records only the password's length), used for nothing else, and removed along with the one-off temporary directory. Every other tool on the site (images, local PDF processing, text, QR codes and so on) still runs entirely in your browser - those files never leave your machine.
No - and that capability is not offered. The password must come from you: correct password converts, wrong password errors out immediately. We do no guessing, no dictionaries, no brute force, and no bypassing. If you do not know the password, this page cannot help - ask whoever gave you the file for it.
AES-256, AES-128 and RC4 (40/128-bit), including files that only have an owner/permissions password restricting editing, printing, copying or form filling. The output keeps the text layer and vector graphics - searchable, copyable, crisp when zoomed; it is not a re-screenshot. Content and layout are unchanged; file size may shift slightly.
Because those files open fine already (no open password) - they merely carry a permissions password restricting editing or printing. In that case leave the password field empty and click unlock-and-download; on success the page states truthfully that permission restrictions were removed, not that an open password was.
20MB per file, passwords up to 128 characters; over either, the page blocks before uploading. Typical failures with plain messages: this PDF needs an open password (400), wrong password (400), this PDF has no password and nothing to remove (400), file is not a PDF or is corrupt (400), over the cap (413), quota used up (429), timeout (504), service unavailable (503). A failure never modifies your original file - fix the password or swap the file and retry.