About this tool
If you have a PDF that is password-protected and you know the password, this tool removes the encryption so the file opens without a password going forward. Useful when you have inherited a protected PDF, when the original protection is no longer needed, or when you need to merge / edit the file with tools that do not handle encrypted PDFs.
You must know the password - we cannot recover or crack lost passwords. The tool decrypts in your browser using the password you provide and re-saves an unencrypted copy.
How it works
Open your protected PDF
Drop the file. The tool detects the encryption.
Type the password
The password you used to open the PDF.
Unlock and download
The decrypted PDF saves to your device. Open without a password going forward.
Use cases
Inherited password-protected files
Project documents from a former colleague where the protection is no longer needed.
Pre-processing for merging / editing
Some tools refuse to operate on encrypted PDFs. Unlock first, then edit, then re-protect if needed.
Personal archives
Bank statements that came encrypted but you want a clean local copy.
Format and spec details
| Engine | pdf-lib with crypto module |
|---|---|
| Required input | Password (user or owner) |
| Output | Unencrypted PDF, identical content |
| What we do not do | Brute-force or recover unknown passwords |
Tips and best practices
- Re-protect with PDF Protect if you only needed the password removed temporarily.
- If you are sharing the unlocked file, consider that anyone with it can read it.
- Store passwords in a password manager (1Password, Bitwarden, KeePass) - never in plaintext files.
How to use the PDF Unlock
The PDF Unlock is a browser-based tool that runs entirely on your device. Inputs you enter never reach a server - all calculations happen client-side in JavaScript. This means:
- Privacy: nothing is logged, sent, or stored by 3Tej. Inputs disappear when you close the tab.
- Speed: results update as you type. No network round trip.
- Offline use: once the page is cached, it works without internet.
- No signup: no account, no email, no rate limits.
Step by step
- Enter your inputs in the form above. Each field is labeled with its unit (currency, percent, kg, etc.) and the expected range.
- Read the result as it updates. The number reflects the formula commonly accepted in PDF Unlock-related calculations.
- Adjust to see sensitivity: change one input at a time and watch how the output moves. This is the fastest way to understand which variable matters most.
- Copy or screenshot the result for later reference. The page state persists for the session if your browser allows it.
When you would use this
- Quick estimates: when you need a number now and don't want to open a spreadsheet.
- Sensitivity analysis: testing how a result changes as inputs vary, before committing to a real-world decision.
- Comparison: running the same calculation with different inputs to compare options side by side.
- Learning: building intuition for how the underlying math behaves.
- Documentation: capturing a snapshot of inputs and outputs at a point in time.
Privacy and offline operation
Every operation in this tool runs client-side using your browser's built-in APIs (Canvas, Web Audio, WebAssembly). No data is uploaded. After the initial page load you can disconnect from the internet and the tool keeps working.
We use Google Analytics and AdSense for the page itself, but neither sees the content of the files you process.
Frequently asked questions
Can you crack a forgotten password?
No. AES-256 protected PDFs with strong passwords cannot be cracked in any reasonable time. Use a password manager going forward.
Is the password sent to a server?
No - decryption happens entirely in your browser.
What if I only have the user password, not the owner password?
The user password is what opens the file. With it, the file decrypts.
Will unlocking change the content?
No - content is identical, only the encryption layer is removed.
Is the PDF Unlock accurate?
The PDF Unlock applies the standard formula for pdf unlock. Accuracy is limited only by your input precision. For decisions with material consequences, use the result as a starting point and verify with a qualified professional or the relevant official source.
Is the PDF Unlock free?
Yes. 100% free, no signup, no payment, no API key. The site is funded by display ads that appear around the tool but not inside the calculation flow.
Are my inputs saved?
No. Inputs stay in your browser tab. Closing the tab discards them. The site uses Google Analytics for traffic measurement (anonymized) but does not see what you type into the form.
Can I use the PDF Unlock on my phone?
Yes. The tool is responsive and tested on iOS Safari, Android Chrome, and major desktop browsers. Touch targets meet Apple's 44pt and Google's 48dp minimum guidance.
How do I report a bug or suggest improvement to the PDF Unlock?
Email hi@3tej.com with the URL of this page and a description of what you saw vs expected. We typically respond within 72 hours and update calculators when rules or formulas change.
How accurate is the PDF Unlock?
It applies the standard formula. Accuracy is limited only by your input precision. For decisions with material consequences (taxes, medical, legal, structural), use the result as a starting point and verify with a qualified professional in the relevant field.
Is the PDF Unlock free to use?
Yes. 100% free, no signup, no payment, no API key. The site is funded by display ads around the tool but not inside the calculation flow.
Are my inputs saved anywhere?
No. All inputs stay in your browser tab. Closing the tab discards them. The site uses Google Analytics for traffic measurement (anonymized) but the analytics never see what you type into the form.
Does the PDF Unlock work offline?
Yes. Once the page has loaded, it works without internet. The calculation runs in JavaScript on your device.
Can I share results from the PDF Unlock?
Take a screenshot or copy the output. The page doesn't generate shareable URLs for specific calculations - inputs stay in your browser only.
Why are the results different from another pdf unlock tool?
Most likely: different formula assumptions, different default values, different rounding rules, or different applicable rates. Check the methodology if both tools document it. Both can be valid for different scenarios.