PDFロック解除
無料·登録不要·ファイルは端末の外に出ません
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.
設計からプライベート
処理はすべてブラウザ内で完結。アップロード・保存・共有は一切ありません。
登録不要・透かしなし
アカウント不要、メール不要、制限なし。出力は入力とまったく同じ。
Removes restrictions too
Print-disabled or copy-protected documents unlock along with the password — the file becomes fully yours again.
どの端末でも動作
Windows、Mac、Linux、Android、iOSで同じ速さ — インストール不要。
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はブラウザで動作 — インストールも設定も更新も不要。
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.
関連するPDFツール
続けて — PDF作業に必要なすべてが、無料・ローカル実行。