Do you crack PDF passwords?

No. You must type the correct open (user) password. There is no wordlist, GPU attack, or “forgot password” recovery. If you do not know the password, this page cannot help.

Is the file uploaded?

No. Decrypt-and-save runs in this tab with a client-side PDF library.

User password vs owner (permissions) password?

This tool targets the **open** password that stops you from viewing the file. Owner-only restriction files (print/copy flags without an open password) may already open; use a PDF editor for permission flags if the document is not encrypted for opening.

The Sample file uses the password `sample` so you can try the flow without a real confidential PDF.

Utill.net

解除 PDF 密碼

瀏覽器處理

在您知道開啟密碼時移除密碼或權限限制。不會破解未知密碼。

解除僅在瀏覽器中進行。必須知道密碼——不會破解未知密碼，也不會上傳。

拖放 PDF，或在下方選擇

瀏覽檔案

PDF 密碼

您已經知道的開啟（使用者）密碼。本工具不會猜測或破解密碼。

原始—
結果—

這個工具是什麼？

An honest PDF unlocker: it decrypts a file only when you supply the correct open password, then saves a copy without encryption. Everything stays in the browser.

It is not a cracking service, not Adobe Acrobat, and not a way to bypass someone else’s documents.

常見用途

You passworded a scan last year and still remember the phrase, but a website rejects encrypted uploads
A colleague sent a locked PDF and also sent the password in another channel
You want an unencrypted copy on disk after opening the file locally

如何使用

Drop the encrypted PDF.
Enter the password you already know (Sample uses sample).
Download PDF. If the password is wrong, you get an error — not a guessed file.

範例

Input	Notes
Sample locked PDF, password `sample`	Demonstrates success; output opens without a prompt.
Correct user password on a real file	Unencrypted copy; keep it as carefully as the original secret.
Wrong password	Error; no partial dump.
Unencrypted PDF	Message that the file is not password-protected.

實務上常見陷阱

Not a cracker: missing passwords stay missing. There is no “try common passwords” mode on purpose.
Some AES/revision combinations may fail in the library even with the right password; that is a decoder limit.
Unique gotcha: saving an unlocked copy does not revoke the original encrypted file. Anyone with the old file and password can still open it.

參考資料

最後審閱: 2026-08-30

常見問題

Do you crack PDF passwords?: No. You must type the correct open (user) password. There is no wordlist, GPU attack, or “forgot password” recovery. If you do not know the password, this page cannot help.
Is the file uploaded?: No. Decrypt-and-save runs in this tab with a client-side PDF library.
User password vs owner (permissions) password?: This tool targets the **open** password that stops you from viewing the file. Owner-only restriction files (print/copy flags without an open password) may already open; use a PDF editor for permission flags if the document is not encrypted for opening.
Sample password?: The Sample file uses the password `sample` so you can try the flow without a real confidential PDF.