Mở khóa PDF
Miễn phí·Không cần đăng ký·Tệp của bạn không bao giờ rời thiết bị
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.
Riêng tư từ thiết kế
Xử lý diễn ra hoàn toàn trong trình duyệt của bạn. Không tải lên, lưu trữ hay chia sẻ bất cứ thứ gì — tuyệt đối.
Không đăng ký, không hình mờ
Không tài khoản, không email, không giới hạn. Kết quả đầu ra y hệt bản gốc.
Removes restrictions too
Print-disabled or copy-protected documents unlock along with the password — the file becomes fully yours again.
Chạy trên mọi thiết bị
Trải nghiệm nhanh như nhau trên Windows, Mac, Linux, Android và iOS — không cần cài.
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 chạy trong trình duyệt — không cài đặt, không cấu hình, không cập nhật.
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.
Công cụ PDF liên quan
Tiếp tục — mọi thứ bạn cần để làm việc với PDF, tất cả miễn phí và chạy cục bộ.