# Protect PDF

> Encrypt any PDF with a password. The encryption happens in your browser, so your password is never transmitted.

Password-protect any PDF with 128-bit encryption, free. Encryption runs 100% in your browser - your file and password never leave your device.

- **Canonical:** https://www.ailovekit.com/pdf/protect-pdf/
- **Category:** PDF Tools
- **Processing:** Runs entirely in your browser. Files are never uploaded to AiLoveKit servers.

## Encrypt a PDF Without Sharing It

Password-protecting a PDF on most websites means uploading the unprotected document first - defeating the purpose. AiLoveKit performs the full **PDF encryption** in your browser: your file and your password are used locally to produce a standard encrypted PDF that opens in every major reader.

## When to Password-Protect a PDF

- Contracts and agreements shared by email.

- Financial statements, invoices, and payslips.

- Medical or legal records that must travel through untrusted channels.

Pair encryption with [Remove Metadata](https://www.ailovekit.com/pdf/remove-metadata/) to strip author and software fingerprints before sharing.

## Frequently Asked Questions

**What encryption is used?**

Standard PDF security (128-bit RC4, compatibility level used by all major PDF readers including Acrobat, Preview, and Chrome).

**Can I remove the password later?**

Open the encrypted PDF in any reader with the password, print or re-save it, or use a decrypt tool. Keep your password safe - it cannot be recovered if lost.

**Is my password sent to a server?**

Never. The encryption key is derived inside your browser; only the encrypted result touches your disk.

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Source: https://www.ailovekit.com/pdf/protect-pdf/
Part of AiLoveKit: https://www.ailovekit.com/
Machine-readable index: https://www.ailovekit.com/llms.txt