Payslips, bank statements, medical reports and copies of your ID are often sent by email or WhatsApp. If the message goes to the wrong person, or someone gets into the account later, anyone can open the file. Adding a password to the PDF fixes that: without the password, the file can’t be opened at all.

How to add a password to a PDF

  1. Open Protect PDF.
  2. Choose your PDF.
  3. Type a password, then type it again to make sure there’s no typo.
  4. Choose whether people who open it may print it and copy its text (Allow printing, Allow copying text).
  5. Click Protect PDF, then Download protected PDF.
  6. Open the downloaded file once to check that it asks for the password.

The PDF is locked with strong AES encryption. It all happens in your browser, so neither the file nor the password is sent anywhere.

Choosing a good password

  • Make it long: at least 12 characters. Length matters more than strange symbols.
  • Avoid the obvious: not your NIC number, birthday, phone number or “123456”. These are the first things someone would try.
  • Let a tool pick one: Password Generator makes a random, strong password for you.
Send the password separately
Don’t put the password in the same email as the PDF. Send it in a different way, for example by SMS or a phone call. Then someone who sees the email still can’t open the file.

What “Allow printing” and “Allow copying” do

Unticking these asks PDF apps not to print the file or let people copy its text. Most PDF readers respect this, but it’s a request, not a lock. The real protection is the password needed to open the file. For anything truly secret, rely on the password and only share it with people you trust.

How to remove a password from a PDF

Banks and employers often send statements and payslips as locked PDFs. That’s safe for email, but some upload forms reject locked files, and you can’t merge or convert them. If you know the password, you can save an unlocked copy:

  1. Open Unlock PDF.
  2. Choose the locked PDF and type its password.
  3. Click Unlock PDF, then Download unlocked PDF.

The new copy opens without a password. Your original locked file stays as it was.

Watch out
Unlocking needs the correct password. It’s for your own files. Nobody can recover a forgotten password for you, so write it down somewhere safe when you lock an important document.

Common questions

How secure is a password-protected PDF?

With a long, random password it is very secure, because the file is encrypted with AES. A short, guessable password is the weak point, not the encryption.

Can I open the protected PDF on my phone?

Yes. Phones, computers and all common PDF readers ask for the password and then open the file normally.

I forgot the password. Can you unlock it?

No. Without the password the file can't be decrypted, by us or anyone else. Ask whoever made the file to send it again.

Is my password sent to ToolNest?

No. The PDF is locked and unlocked inside your own browser. The password never leaves your device.