PyrbitPyrbit › Pyrbit PDF › PDF tools › Protect PDF
Protect & Sign
Password-protect a PDF.
Lock a PDF so only people with the password can open it. Pyrbit PDF encrypts it with AES-256 in your browser — the unprotected file never leaves your device.
Runs in your browser·Files are never uploaded·One free document every 24 hours with a Google account
How it works
Protect PDF in three steps.
Choose the PDF
Select the document to protect.
Set the password
Type the password twice (at least 4 characters). Optionally add a separate owner password for full access.
Save the protected PDF
The file is encrypted with AES-256 and saved to your device.
What you can do
What Protect PDF does.
- AES-256 encryption
- Password required to open the file
- Optional separate owner password
- Encryption happens on your device
Private by design
Your PDF never leaves your device.
Protect PDF runs inside your browser tab. The file you choose is read from your device, processed there, and the result is saved back to your device — it is never uploaded to a Pyrbit server, so there is no copy to keep or delete.
Processed in your browser
The Pyrbit PDF engine runs on your computer or phone, not in the cloud.
No upload
Your document isn’t sent anywhere — not to us, and not to a third-party converter.
Sign-in is for your plan only
Your Google account keeps track of your free daily document and Pyrbit Pro. It never gives us your files.
Prefer offline?
The Pyrbit PDF apps do the same work on your phone, tablet or Mac — even without a connection.
Web or app
Use Add Password in your browser, or in the free app.
Web browser
Works on any computer, tablet or phone with a modern browser. Sign in with a Google account to use the web app: one free document every 24 hours, with any tool. Pyrbit Pro (₹79/month or ₹599/year) gives unlimited use with no ads.
iPhone, iPad & Mac
Every tool, including Add Password, with no file-size limit and offline use. Free on iPhone and iPad (with ads); the Mac app is paid.
Android & Chromebook
Every tool, including Add Password, with no file-size limit and offline use. Free, supported by ads.
FAQ
Protect PDF questions.
What if I forget the password?
There’s no way to recover it — not for us, and not for anyone else. Keep it somewhere safe.
Will the protected PDF open in other readers?
Yes. AES-256 is a standard PDF encryption that Adobe Acrobat, Preview, Chrome and other readers support; they’ll ask for the password.
How do I remove the password later?
Use Unlock PDF and enter the password once to save an unlocked copy.
Is Protect PDF free?
On the web, sign in with a Google account and you can use Protect PDF — or any other tool — on one free document every 24 hours. Pyrbit Pro (₹79/month or ₹599/year) gives unlimited use with no ads. The Pyrbit PDF apps for iPhone, iPad and Android are free, supported by ads.
Ready when you are.
Open Add Password in your browser — your file stays on your device.