Is PDF 加密 / 解密（AES-256 密码保护） free? Do I need to register?

Yes, it's completely free. No registration required for most tools. Tools that store personal data (e.g., favorites, conversion history) optionally support login for cross-device sync.

Do I need to install anything to use PDF 加密 / 解密（AES-256 密码保护）?

No installation needed. Open the web page and use directly. Works in all modern browsers (Chrome, Edge, Firefox, Safari) on both desktop and mobile.

Is my data safe when using PDF 加密 / 解密（AES-256 密码保护）?

Tools marked "browser-local / no upload" process your files entirely on your device. Server-side tools (e.g., PDF conversion) delete temporary files immediately after processing — no persistent storage.

Are there daily usage limits on PDF 加密 / 解密（AES-256 密码保护）?

Most pure-frontend tools are unlimited. Tools that consume server resources (format conversion, OCR) have a free daily quota; logging in gives you a higher quota. Check "Remaining today" at the top of the tool page for details.

PDF 加密 / 解密（AES-256 密码保护）

Encrypt

Decrypt

Click or drop a PDF here

File uploaded to server, deleted immediately after processing (password not logged). Avoid uploading confidential business files to unknown sites.

Set password

At least 1 char, max 256

Confirm password

Re-enter the password

Upload a PDF, enter password, click action

✨ Features

• Backend pdfcpu Go lib (AES-256); no system deps • File deleted from server immediately after processing; password never logged • Encrypt + decrypt in one view; toggle mode • 100MB file limit, second-level processing

📖 How to Use

Step 1

Switch encrypt / decrypt mode

Step 2

Upload a PDF file

Step 3

Enter password (re-confirm for encryption); click — browser auto-downloads

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PDF 加密 / 解密（AES-256 密码保护）

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