Unlock PDF (Remove Password)

Typing the same password every time you open a statement, payslip or contract gets old fast, and restricted PDFs may refuse to print or let you copy text. If you know the password — or the file is only restricted — this tool saves an unprotected copy. It decrypts the file in your browser with the standard PDF security algorithms; the PDF and the password never leave your device.

How to use this tool

1. Choose the protected PDF (or several that share one password).
2. Type the password that opens it. Leave the box empty if the file opens without one and only blocks printing, copying or editing.
3. Press the button: the tool checks the password, decrypts every page and verifies the copy opens with the same pages and text.
4. Download the unlocked PDF.

Formula

RC4 and AES-128 files: file key = MD5(padded password + O entry + permissions + document ID), hashed 50 more times for 128-bit keys; each object is then decrypted with a key derived from the file key and its object number. AES-256 files: the password is hashed with SHA-256/384/512 rounds (ISO 32000-2 Algorithm 2.B) to unwrap a random 256-bit file key.

The password is checked before anything is decrypted, so a wrong one is reported at once. Unknown passwords can’t be guessed or recovered.

Example

A bank statement protected with AES 256-bit and the password 0412 opens with that password; the tool unwraps the file key, decrypts all objects and saves statement-unlocked.pdf. The check confirms the copy has the same 4 pages and text and opens with no password.

Use it only for files you may open

Remove protection only from documents you own or are allowed to use — for example your own statements, or files whose sender gave you the password. A PDF with only permission restrictions (no open password) can be unlocked without any password, as every PDF reader can already display it; respect the author’s wishes for printing and copying. Files protected with certificates (public-key security) need the recipient’s digital ID and are not supported.