Password-protect a PDF
Before emailing a payslip, a medical report or a contract, adding a password limits prying eyes if the message is forwarded or the mailbox compromised. The tool encrypts the document with the password you choose: only people who know it can open the file. Encryption is computed in your browser — neither the document nor the password is transmitted. An honest limit: this protection controls file opening; it replaces neither an electronic signature nor a secured delivery channel, and a weak password stays vulnerable. Protection applies to personal documents (statements, ID papers) and professional ones alike — and you can follow up with a “Confidential” watermark to mark the document visually.
FAQ
Is my password transmitted or stored anywhere?
No. It is only used to compute the encryption, done in your browser, then forgotten. Nothing is sent or kept — if you lose the password, nobody can recover it for you.
What type of protection is applied?
Standard PDF encryption that requires the password at document opening, compatible with common readers (Adobe Reader, macOS Preview, browsers).
How do I share the password with the recipient?
Through a different channel than the file: SMS, encrypted messaging or in person. Sending the PDF and its password in the same email defeats the protection.
Can I remove the protection afterwards?
Yes, with the “Unlock PDF” tool and the password. You get an unprotected copy; the encrypted original remains available.
Does a password prevent copying or printing?
The applied protection controls opening the document. Fine-grained restrictions (blocking print or copy) rely on PDF permissions, a convention layer readers may ignore — do not count on it against a determined recipient.
What if I forget the password I set?
There is no backdoor: an encrypted PDF without its password stays closed. Pick a memorable password or keep it in a password manager.
What kind of encryption is applied?
AES-256 — the strongest method defined by the PDF format — requiring the password to open the document. The result stays compatible with common readers (Adobe Reader, macOS Preview, browsers).
Can I protect several files at once?
Yes — the tool is batch-eligible: in batch mode every file receives the same password, and you download the protected versions individually or as a ZIP archive.
Does protection keep the content identical?
Yes — encryption wraps the document without altering pages: text, images, bookmarks and forms are strictly identical after protection; only opening the file becomes password-gated.
Will an administrative portal accept a protected PDF?
Often not — many platforms reject encrypted files because their content cannot be checked. For a portal upload, prefer the unprotected document and compress it under the required threshold instead.
What does the recipient see on opening?
A password prompt before any display — the document stays opaque until the code is entered. Once opened, it reads and prints normally in any common reader.
Can the recipient remove the protection?
With the password, yes — anyone who can open the file can produce an unencrypted copy (including with “Unlock a PDF”). Protection controls who reads the document, not what a legitimate reader does next with it.
User password or owner password?
The tool sets your chosen password for both roles at once: it gates opening the document and controls its permissions — one password to remember and to share, instead of two to manage.
What are the file limits?
One document up to 50 MB and 1,000 pages per operation — encryption rewrites the file in memory on your device, so very large documents take a few seconds.
Is an encrypted PDF still compressible?
Encrypted content compresses poorly by nature — if the file must also fit a size limit, run “Compress PDF” first, then apply the password on the lighter copy.
How to proceed
- Drop your PDF into the upload area
- Enter a strong password (long, unique, memorable for the recipient)
- Download the protected PDF and share the password via another channel
- Check that the protected PDF opens in your usual reader