iTrustPDF
"Unlock a PDF" can mean two different things. Here is how to tell them apart, what is possible, and how to remove protection from a file you are allowed to open.
Short answer: if you know the password, or the PDF only restricts printing, copying or editing, you can remove the protection in a few clicks. If a PDF needs a password to open and you do not have it, no legitimate tool can recover it.
Two kinds of PDF protection
| Type | What it does | Can you unlock it? |
|---|---|---|
| Open password (user password) | You must enter it before the PDF opens at all | Yes, if you know the password. Not if you have forgotten it |
| Owner restrictions (permissions) | The PDF opens normally but blocks printing, copying text or editing | Yes, usually without any password |
Before you start
Only unlock files that you own or have permission to modify. Removing protection from documents you have no right to use may be illegal where you live, and an owner of a document may have added restrictions on purpose.
How to unlock a PDF with iTrustPDF
Open the tool and add your PDF
Go to Unlock PDF and drop in the file (up to 100MB). The first time you use it, your browser downloads a small decryption engine (about 1.3 MB); the PDF itself stays on your device.
Read the message
The tool tells you whether the PDF needs a password to open, only has restrictions, or is not protected at all. If it is not encrypted, there is nothing to unlock.
Enter the password if asked
If the PDF needs a password to open, type it in. For restrictions-only files no password is needed. A wrong password shows an error and no file is created.
Unlock and download
Click Unlock PDF, then download the new file. The text, images and layout are not re-rendered, so quality stays the same and text stays selectable.
If you forgot the password
- Check where the PDF came from: ask the sender, your bank, your employer or the person who created it.
- If you made the file, look for the original document (for example a Word file) and export a new PDF without a password.
- Be careful with software that promises to "crack" passwords. Strong modern encryption cannot simply be bypassed, and tools that claim otherwise are often unreliable or unsafe.
Common problems
- "That password is not correct": check capitals, spaces and keyboard language.
- "This file could not be read": the PDF may be damaged or incomplete. Try downloading it again.
- Nothing to unlock: some PDFs only look protected because they are scans or flattened images.
What to do after unlocking
Once the protection is gone you can merge, compress, edit or convert the file. If the document is sensitive, add a new password again with PDF password protection before sharing it.
Quick answers
Does unlocking change my PDF?
Only the protection is removed. The content is copied as it is, so quality and selectable text are kept.
Is my PDF uploaded?
No. The unlocking runs in your browser. The decryption engine is downloaded from a content delivery network, but your file is not sent anywhere.
Which encryption types work?
Common PDF encryption, including RC4 (40 and 128-bit) and AES (128 and 256-bit), is supported.
Unlock a PDF you own
Remove the password or the printing, copying and editing restrictions from your PDF, right in your browser.
Open Unlock PDF →