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Add an AES-256 password to a PDF, or remove a known password, entirely in your browser. Files never leave your device.
Upload Files
Add PDFs to password-protect
Encrypts with AES-256 entirely in your browser — the file and password never leave your device. Keep the password safe; it cannot be recovered.
Lock or unlock PDFs without uploading anything. The Add Password mode encrypts your PDF with AES-256 — the same standard Adobe Acrobat uses — so it can only be opened with the password you choose, ideal for sharing contracts, statements, payslips, and reports over email or chat. The Remove Password mode takes a PDF you can already open and saves a clean, unprotected copy so you no longer have to type the password every time (you must know the current password — this is not a cracker). Everything runs locally in your browser using a fully client-side encryption engine, meaning the document and the password never touch a server and nothing is logged or stored. You can protect or unlock several PDFs at once and download them together as a ZIP. Keep your chosen password somewhere safe, because an encrypted PDF cannot be recovered if the password is lost.
No signup required. Open Password Protect or Unlock a PDF Online and start working immediately.
Yes. Standard flows process locally on your machine, so files are not uploaded as part of normal usage.
In most workflows, anyone handling practical document operations who needs fast on-device execution without heavyweight local installs.
For typical usage, yes, though larger files and advanced operations generally perform better on desktop hardware with more memory. This helps keep outputs consistent across different devices.
Practically speaking, no account is required for core workflows. You can start immediately and process directly right here. That makes the result easier to verify before publishing.
Check out our technical guides to learn more about how browser-side processing works.
Read Glossary