PDF Protection
Add password to your PDF or remove password from encrypted PDF
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How to protect a PDF with a password
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Upload your PDF.Drop the file or click to browse. The PDF stays in your browser; we never index its content.
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Set a strong password.Pick something at least 8 characters with a mix of letters, numbers, and symbols. Write it down somewhere safe — there is no recovery if you lose it.
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Download the protected PDF.In a few seconds you get a new PDF that prompts for the password every time someone tries to open it. The original stays untouched on your device.
Who is it for?
Anyone who emails or shares a document that should not be read by the wrong person. A small business owner sending a client an invoice, an employee forwarding a payslip, or someone attaching a scan of their ID or a medical report — all can add a password so that even if the message is forwarded or the attachment leaks, the contents stay locked. Share the password by text or phone, separate from the file, and only the intended reader gets in.
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What is PDF Password Protection?
Password-protecting a PDF encrypts the file so anyone trying to open it has to type the password first. It is the simplest way to share a contract, salary info, medical record, or any other private document by email, knowing that even if the file forwards to the wrong person, they cannot read it without the key. With PDF7 you set a password in three clicks — no software, no signup, no learning curve.
We use AES encryption, the standard adopted by every modern PDF reader and approved for government use. The protection sticks to the file itself; if someone copies the PDF to another computer or emails it elsewhere, the password is still required. To remove it later, share the password with the recipient — or use our Unlock PDF tool if you forgot what you set (provided you remember the password!).
Strong protection starts with a strong password: a memorable passphrase of several unrelated words usually beats a short string of random symbols, and reusing a password you already use elsewhere defeats the point. Keep in mind what encryption does and does not do — it locks the contents of the PDF, so the file is unreadable without the key, but it cannot stop someone who already knows the password from copying the text or taking a screenshot once they have opened it. It also does not hide the file name or the fact that an encrypted document exists. For that reason, send the password over a separate channel from the file itself, and treat the open-document moment as the point where your control ends. Used this way, AES protection is a practical, widely trusted layer for everyday private documents.
Why password-protect PDFs with PDF7?
AES encryption
We use AES-128 or AES-256 — the same standards governments and banks rely on. Decrypted in memory only with the right password.
Universal compatibility
The protected PDF opens in Adobe Reader, Apple Preview, Chrome, Foxit, mobile readers — anywhere a PDF works.
Files never stored
Your file is yours — we do not access it. It is removed once processing finishes.
Free and unlimited
No daily caps, no signup wall, no watermark on the protected output. Encrypt as many PDFs as you need.
Frequently asked questions
What if I forget the password?
There is no recovery. PDF passwords are not "saved" anywhere — the encryption is mathematical, and without the key no one (including us) can decrypt the file. Always write down or save your password somewhere safe before closing the tab.
Is AES safe enough for sensitive documents?
Yes. AES is the global encryption standard used by banks, militaries, and password managers. With a strong password (8+ chars, mixed case, numbers, symbols) the file is effectively unreadable to anyone without the key.
Can I share the protected PDF over email?
Absolutely. The encryption travels with the file — even if the email is intercepted, the recipient still needs the password to open it. Just send the password through a different channel (text message, a phone call) for best security.
Can I remove the password later?
Yes — use our Unlock PDF tool. You will need the original password to do it; without the password, the file cannot be decrypted by us or anyone else.
Does protecting a PDF change its content or quality?
No. Encryption wraps the existing file without touching the pages — text, images, fonts, and layout stay byte-for-byte the same, and the file size barely changes. Only the access requirement is added, so the protected PDF looks identical once the correct password is entered.
Is there a file size limit, and how long does it take?
Most documents are protected in a few seconds, since encryption is a lightweight operation that runs in memory. Very large files (hundreds of MB) take a little longer to upload and process, but there is no signup and no daily cap on how many PDFs you can encrypt.