Protect PDF — Encrypt & Download
Upload a PDF, (optionally run OCR to add selectable/editable text), then protect it with a password. Everything runs locally in your browser.
Select PDF file or drag it here
Files are processed locally; nothing is uploaded.
You will use this password to decrypt the file later.
Higher = stronger key derivation (slower). Default 200,000
Note: the encrypted file is a secure AES-GCM ciphertext. To open, use the Decrypt helper below (or re-open this page and use "Decrypt" UI).