How to Unlock a Password-Protected PDF When You Know the Password
You have a PDF that asks for a password every time, and you want a copy that simply opens. If you know the password, this takes four steps. If you do not, here is what is and is not possible.
Add the protected file, enter its current password and download unlocked.pdf. The decryption runs in your browser.
The short version: you must know the password
This tool removes a password from a PDF. It does not guess, crack or bypass one. You type the current password, the tool checks it, and if it is right you get a copy of the file that opens without any prompt. If you do not have the password, no setting on this page will help, and no honest online tool can promise otherwise for a properly protected file.
Remove the password in four steps
- Open PDF Unlock and add the file with Select PDF File (or drop it on "Drop a protected PDF here").
- Enter the password in the Current password box.
- Press Unlock PDF. The status line reads "Unlocking your PDF..." while it works.
- When it says "Done! Your unlocked PDF is ready to download.", press Download Unlocked PDF. The file is saved as
unlocked.pdf.
The result box reports the new size, for example "Password protection removed" followed by the file size. Your original protected file is not changed, so keep it until you have opened the new one and confirmed that every page is there.
Why you would remove a password at all
A password is useful while a file is travelling and a nuisance once it is not. The usual reasons are practical:
- You protected a draft yourself and the review is over.
- You want to merge, split or rotate the file, and the other tools need a readable document to work from.
- An archive copy should open without remembering a password five years from now.
- You are changing the password. The route is to unlock with the old one, then run Protect PDF again with the new one.
Use it on files you own or have permission to open. If someone sent you a protected document and gave you the password, removing it from your own copy is ordinary housekeeping. Removing protection from a document you were never meant to open is not what this tool is for.
What this tool can open, and what it cannot
PDF encryption comes in several generations. This tool handles the RC4 family of the standard security handler, in 40-bit and 128-bit forms. That covers files made by the Protect PDF tool on this site and many older documents. It does not handle AES encryption, which is what many current programs use by default.
| Situation | What happens | What to try |
|---|---|---|
| RC4 file, correct password | unlocked.pdf is produced | Check the pages, then use it |
| RC4 file, wrong password | "Incorrect password. Please check the password and try again." | Retype by hand; check case and spaces |
| AES-encrypted file | A message that AES is not supported yet | Open it in the program that made it and save an unprotected copy |
| File with no password | "This PDF does not appear to be password-protected" | Nothing to do; use it directly |
The tool shows these messages as they are, so the text on screen is a reliable guide to which row you are in.
Wrong password: a checklist before you give up
- Case. Passwords are case sensitive. Check Caps Lock.
- Hidden characters. Pasting from an email often adds a space at the start or end. Type it by hand once.
- Look-alikes. Zero and the capital letter O, the digit 1 and a lower-case L.
- The wrong password. Some documents have separate passwords for opening and for permissions. This tool asks for the one needed to open the file.
- The wrong file. Several versions of a document with different passwords is more common than it should be. Try the other copies.
If none of these works, the only reliable move is to ask whoever created the file. A forgotten password on a well protected PDF is simply gone.
Does unlocking change the document?
The tool re-derives the key from your password, decrypts the content and writes a new file without the encryption entry. The pages, text and images are the same content; what disappears is the lock. As with any rebuilt PDF, the file size can differ a little from the original, which is why the result box shows it. If size matters, run Compress PDF afterwards, or read what works when a PDF is too large to email.
Once the file is unlocked you can use the rest of the toolkit on it. A typical sequence is to remove the password, then reorder the pages or delete the ones you do not want, and finally protect the result again if it still needs a lock. That last guide also explains how weak RC4 40-bit protection really is.
Privacy for this tool
The password and the file are processed in your browser with JavaScript, and the tool page states that neither is sent to a server. The page does load its scripts from a CDN, so you need a connection to open it, but your document is not part of those requests.
Frequently Asked Questions
Can I unlock a PDF without the password?
No. PDF Unlock needs the current password to decrypt the file and does not crack or guess passwords. If the password is lost, ask the person who created the file.
Which kinds of password protection does it support?
The standard RC4 handler in 40-bit and 128-bit forms. AES-encrypted PDFs are not supported yet, and the tool says so when it meets one.
Why does it say the password is incorrect when I am sure it is right?
Check capitalisation, a stray space from pasting, and look-alike characters such as zero and O. Type it by hand. Also confirm you are using the open password.
Does unlocking alter my pages or images?
The content is decrypted and saved in a new file without the encryption layer. The original file is untouched, and the new size is shown in the result box.
What does the tool say if my PDF has no password?
It reports that the PDF does not appear to be password-protected. You can use the file directly.
Is my password sent anywhere?
No. The decryption is done in your browser, and the tool page states that neither the file nor the password is uploaded.