Advertisement
In-memory processing
Protect PDF runs as JavaScript inside this tab.
Never uploaded
Safe for financials, contracts and NDAs.
No caps or sign-ups
File size is limited only by device memory.
Advertisement
Password-protect a PDF before emailing payslips, tax returns, medical records or contracts, so only people you give the password to can open it. The file is encrypted in your browser and never uploaded.
Also known as Password protect PDF, Encrypt PDF and Lock PDF.
The PDF is encrypted with AES-256, the strongest standard PDF encryption, which every modern PDF reader supports. Security depends on the password: use a long passphrase and share it separately from the file. A forgotten password cannot be recovered.
Yes. Protect PDF runs entirely inside your web browser using JavaScript, so the file never leaves your device. It is safe for confidential documents such as contracts, financial records and IDs.
There is no fixed limit, because the file is processed on your own device. Very large files depend on your device's available memory; a modern laptop or phone handles hundreds of megabytes.
Yes. ZapConvert runs in any modern browser, including Safari on iPhone and iPad and Chrome on Android, with nothing to install. You can add several files at once and download them together as a ZIP.