Unlock a PDF (Remove a Password You Know)
Unlock a PDF you already have access to by removing its password protection, so it opens instantly without prompting for a password. You'll need to enter the current password once, and everything is decrypted locally in your browser.
Drop your file here, or click to choose
What happens to your file and your password
On file selection, the page reads the PDF into memory and tries to open it with the @cantoo/pdf-lib library. If the library reports encryption, the password field appears. On unlock, the same library opens the file with your password and saves a fresh copy without encryption for download. Nothing in this code path sends the file or password to a server. To confirm, open the Network tab in developer tools and unlock a file: no request carries your document.
How to unlock pdf
1Drop the PDF
Drop one PDF onto the upload area or pick it from your device. The page checks right away whether it is encrypted.
2Enter the password
If it is, a "Current password" field appears. Type the password the file currently asks for. If nothing is asked, the tool tells you no password was detected.
- 3
Unlock
Press "Unlock PDF". The button stays greyed out until a password is entered for an encrypted file, and a "Decrypting your PDF" overlay shows while it works.
4Download
Your browser downloads the result as the original file name plus "-unlocked", for example report-unlocked.pdf. Use "Change file" to start over with another one.
Why trust Unlock with sensitive files?
- Stop typing the same password every time you open a document you own or were given the password for.
- Get a file the other tools here can read: merging, splitting and editing all need a PDF that opens without a prompt.
- The password is typed into this tab and used by the page's own code, with no account and no server round trip.
- Pages, text and images are carried over as they are; only the encryption layer is taken away.
A real use case
A landlord gets a signed lease from a letting agent as a password-protected PDF, with the password sent separately. She wants it combined with the inventory report into one file. Merge refuses the encrypted lease, so she unlocks it first with the agent's password, then merges.
Limits and edge cases
- A correct password is required. A wrong one produces the message asking for the correct password, and there is no guessing or recovery feature.
- Only one file is handled at a time. Unlock several documents by repeating the steps.
- If the file opens without any password, the tool says so and still lets you run it to get a re-saved copy, which may not be byte-for-byte identical.
- A file that is not a valid PDF, or is damaged, fails with a general "Incorrect password, or the file is not a valid PDF" error, so the message cannot tell those cases apart.
- The downloaded copy is no longer protected. Anyone who gets it can open it, so store or send it accordingly.
If unlocking doesn't work: what to check
- "Please enter the correct password" The file is encrypted and the password did not match. Passwords are case sensitive, so check caps lock and any characters your keyboard layout may have changed. Copy-pasting from the original email often brings along a trailing space.
- "Incorrect password, or the file is not a valid PDF" A different failure that shares one message. Try opening the file in another PDF viewer. If it will not open there either, the download was probably cut short and needs to be fetched again. If it opens with the password but not here, it may be a variant the library cannot read.
- "No password was detected" Nothing asked for a password, so there was nothing to remove. If a merge or edit still fails on this file, the cause is elsewhere. Try Merge PDF or Split PDF directly on the original.
- You want protection back after editing The unlocked copy is plain. Once you have finished, add a new password with Protect PDF. For background on what happens to files in online tools, read does a PDF tool actually upload your file.
