# Unlock PDF: Arthize vs PDFtk

_Updated July 2026 · Arthize · https://arthize.com/vs/pdftk/unlock-pdf_

To unlock a PDF, Arthize offers a free, private unlock pdf with no watermark — a focused alternative to PDFtk. Unlocking a PDF removes a known password or usage restrictions from a document you own, so it opens and prints without prompting.

## Arthize's unlock pdf vs PDFtk

PDFtk is a command-line PDF toolkit. PDFtk is a free command-line tool for scripted PDF operations.

**Arthize's approach:** Unlocking a PDF removes a known password or usage restrictions from a document you own, so it opens and prints without prompting.

- A visual workspace instead of memorising command-line flags.
- 50+ tools live in one workspace, so you don't jump between single-purpose pages.
- Files are processed inside your private Arthize workspace and deleted after the job — never sold or used to train models.
- Handles conversion, OCR, signing and editing that PDFtk doesn't.

## How to unlock a PDF with Arthize

Unlocking requires the current password — it removes protection you are entitled to remove.

It is used to clear a known password so a file stops prompting on every open.

Arthize does not crack unknown passwords on documents you don't own.

## How to unlock a PDF with Arthize

1. **Open the unlock tool** — Sign in and open the Unlock tool.
2. **Add your PDF** — Upload the protected PDF you have the right to open.
3. **Enter the password** — Provide the current password to authorise removing the protection.
4. **Download** — Get an unrestricted copy that opens without a prompt.

## FAQ

### Is Arthize a good PDFtk alternative to unlock a PDF?

Yes. Unlocking a PDF removes a known password or usage restrictions from a document you own, so it opens and prints without prompting. Arthize does it free with no watermark and deletes the file after the job. PDFtk is excellent for developers automating simple, repeatable PDF tasks from scripts.

### How do I remove a password from a PDF I own?

Unlocking a PDF removes a known password or usage restrictions from a document you own, so it opens and prints without prompting. On Arthize it's free with no watermark and processed privately.

### Can I remove printing restrictions from my PDF?

Unlocking a PDF removes a known password or usage restrictions from a document you own, so it opens and prints without prompting. On Arthize it's free with no watermark and processed privately.