🔓 PDF 解除密码Unlock PDF
用你知道的密码解锁加密 PDF，另存为无需密码、无打印/复制限制的新文件；只有权限限制（没有打开密码）的 PDF 可直接解除，支持 AES-256/AES-128/RC4，本地处理不上传。Unlock an encrypted PDF with the password you know and save a copy with no password and no print/copy restrictions. PDFs with only permission restrictions (no open password) unlock directly. Supports AES-256, AES-128 and RC4; processed locally.
使用说明与常见问题How-to & FAQ
「PDF 解除密码」是什么？What is the Unlock PDF tool?
用你知道的密码解锁加密 PDF，另存为无需密码、无打印/复制限制的新文件；只有权限限制（没有打开密码）的 PDF 可直接解除，支持 AES-256/AES-128/RC4，本地处理不上传。Unlock an encrypted PDF with the password you know and save a copy with no password and no print/copy restrictions. PDFs with only permission restrictions (no open password) unlock directly. Supports AES-256, AES-128 and RC4; processed locally.
如何使用「PDF 解除密码」？How do I use the Unlock PDF tool?
在「PDF 解除密码」中，点击「解锁并下载」按钮即可。支持拖放文件。加密的 PDF 选好后会先出现「打开密码」栏和「打开」按钮，输入密码点「打开」后再继续。In the Unlock PDF: Click "Unlock & download". Drag-and-drop files is supported. For an encrypted PDF, a Password field and an Open button appear after you choose it — enter the password and click Open first.
没有密码也能解锁吗？Can I unlock without the password?
如果 PDF 需要密码才能打开，你必须知道这个密码，本工具不会、也不能暴力破解。如果文件能直接打开、只是禁止打印或复制（仅有权限密码），则无需密码即可解除限制。If the PDF needs a password to open, you must know it — this tool does not and cannot brute-force passwords. If the file opens normally but blocks printing or copying (owner password only), the restrictions can be removed without a password.
解锁后文件有什么变化？What changes after unlocking?
新文件不再加密，打开时不需要密码，也没有打印、复制、编辑等限制；页面内容和图片保持不变，标题、作者等信息会尽量保留。The new file is unencrypted, opens without a password and has no print/copy/edit restrictions. Page content and images are unchanged, and title/author information is kept where possible.
这样做合法吗？Is this legal?
请只解锁你自己的文件或已获授权处理的文件。绕过他人设置的权限限制可能违反版权或使用协议。Only unlock files you own or are authorised to handle. Circumventing restrictions set by others may breach copyright or licence terms.
文件会上传到服务器吗？Are my files uploaded?
不会。PDF 在你的浏览器里用 pdf-lib / pdf.js 处理，文件不会离开你的设备，关闭页面后不留存任何数据。No. The PDF is processed in your browser with pdf-lib / pdf.js; files never leave your device and nothing is kept after you close the page.
「PDF 解除密码」免费吗？需要注册吗？Is the Unlock PDF free? Do I need an account?
「PDF 解除密码」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Unlock PDF is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.