Password-protect a PDF
Encrypt a PDF with a password — entirely in your browser, no upload.
Drag & drop your file here
or click to choose — your file is processed locally and never uploaded
How to password-protect a PDF
- 1
Open your PDF
Drop in the file. It's read locally and never uploaded.
- 2
Set a password
Choose a strong password. It's used to encrypt the file right in your browser.
- 3
Download the protected PDF
Your encrypted PDF is generated on your device and downloaded to you.
Encrypt without trusting a server
Adding a password to a PDF online is self-defeating if you have to upload the unprotected file — and your chosen password — to someone else's server first. pdfnoupload encrypts the document locally in your browser, so both the original file and the password you set stay entirely on your device. The only copy that exists anywhere is the protected one you download.
Real encryption, fully offline
The PDF is encrypted with a strong cipher so it can only be opened by someone who knows the password. Because it all happens on your machine, there's no upload, no watermark, and it works without an internet connection after the first visit. Keep your password safe — without it the file cannot be recovered.
Frequently asked questions
Is my file or password uploaded?+
No. Encryption happens in your browser; neither the file nor the password is ever transmitted. Verify in DevTools → Network.
What if I forget the password?+
There's no recovery — by design. A protected PDF can only be opened with the password you set, so store it somewhere safe.
Can recipients open it normally?+
Yes. Any standard PDF reader will prompt for the password and then open the document as usual.