解锁 PDF
免费·无需注册·文件永不离开你的设备
How to unlock a PDF in 3 steps
Have the password? Remove it permanently — so every future open is one step shorter.
Upload the locked PDF
Drop the encrypted file in the box above. It never leaves your device.
Enter the password
Type the password you already know — the one the document was protected with.
Download the clean copy
Click Unlock. The decrypted PDF downloads immediately, restrictions gone.
Why unlock PDFs with AmiPDF
Your password, your document, your device — nothing in between.
隐私优先
处理完全在你的浏览器内完成。不上传、不存储、不外传——绝不。
无需注册，无水印
无账号、无邮箱、无限制。输出文件与输入完全一致。
Removes restrictions too
Print-disabled or copy-protected documents unlock along with the password — the file becomes fully yours again.
任何设备可用
Windows、Mac、Linux、Android、iOS 上体验一致——无需安装。
When to unlock a PDF
Your own files with passwords you keep typing, inherited documents with print restrictions, purchased material you're licensed to use but can't annotate. With the rightful password, unlocking is legitimate housekeeping.
Decryption is local — the password and file both stay on your machine.
Unlock PDFs on any platform
AmiPDF 在你的浏览器中运行——无需安装、无需配置、无需更新。
Windows
Chrome, Edge, Firefox
macOS
Safari, Chrome
Linux
Any modern browser
iOS
Safari on iPhone, iPad
Android
Chrome, Samsung Internet
Frequently asked questions
Can AmiPDF crack a password I don't know?
No. This tool removes protection using the correct password — it is not a cracker. If you've lost the password, no ethical tool can help.
Does it remove copy and print restrictions?
Yes. If you can supply the password, both the open password and the permission restrictions come off together.
Is unlocking a PDF legal?
When you have the right to the document — it's your file, or you're an authorized recipient with the password — yes. Don't use it on material you're not licensed to access.
Why do I get an error with the right password?
Check for typos and keyboard layout first. If the file uses an unusual encryption flavor, try re-saving it from a desktop reader once, then unlock that copy.
Is my password stored anywhere?
No. It's used in memory to decrypt and then discarded — nothing is transmitted or saved.
Can I unlock many files at once?
One at a time for now — each takes just seconds since everything runs locally.
相关 PDF 工具
继续——处理 PDF 所需的其他工具，全部免费、全部本地运行。