Free Online PDF Unlocker

Instantly unlock any encrypted PDF document online. No downloads required
Drag & Drop the File(s) Here

Safe and secure

Quick and easy

No email



File extension .pdf
Internet media type application/pdf
Description: PDF stands for Portable Document Format and uses the .pdf file extension. It was invented by Adobe in 1993. For many years it has been one of the most commonly used file formats. The main aim of the PDF is to send important information to another person quickly and easily. PDFs can combine text and multimedia within one document, they work with nearly all hardware and operating systems.


Technical Details: PDF is a 7-bit ASCII file with a fixed layout. PDF uses the PostScript language, which makes it possible to display a range of text fonts, graphics and other media in a single, universal file. Some PDF documents have an encryption feature that will keep them from being read until whoever is opening the document provides a password.
Developed by ISO
Initial Release: 15 June 1993
Useful links:


Follow the steps below to unlock a PDF online

  1. Open AltoUnlockPDF – go to in your preferred browser.
  2. Upload a protected document – hit Choose File and browse for it on your device.
  3. Import a protected document – click cloud service icons from Google Drive, Dropbox, or OneDrive.
  4. Remove its password – enter the document’s password and select Unlock Now!.
  5. Get your file: download your document by clicking Download Now! or export it back to the cloud.

The Ultimate Features Comparison Chart

There are hundreds of solutions on the internet that specialize in online document management. Check out the comparison table below to find out why millions of users choose AltoUnlockPDF.

Split PDF
Merge PDF
Combine & Reorder
Extract Pages
Compress PDF
Rotate PDF
No software downloads
Cloud storage Unlimited No info No info
Price Free Free 7-Day Trial paid Free 7-Day Trial paid
Encryption and security
Support 24/7/365 No info
No ads

Customer Reviews — Trusted by great people



The best time-saver ever! I receive tons of emails with documents and Altounlocker easily removes all the restrictions from them, so I can edit the files the way I need to.



I like everything about AltoPDF and its unlocker tool is no exception. I don’t like lots of apps on my phone, which makes AltoPDF’s free online version perfect for me.



Such a great solution! It removes encryption from docs and at the same time protects me as the owner of the file. All I need is my device and Internet connection!

Your opinion matters!

If your experience was picture-perfect, please take a moment to tell us so.

How to Unlock a PDF Document

Remove protection from the document with a user-friendly online unlocker. This web-service is supported by the latest data encryption methods, making the processing of your file safe.

How to unlock a PDF online

Why someone chooses to unlock their PDF online can vary depending on their situation, but whatever the reason, the process should be simple and straightforward, while also being secure. Using a web-based solution like AltoUnlockPDF, you don't need to install any additional software, which significantly accelerates the process, getting you results much faster, and saves money too.  

Unlock a secured PDF online by following the instructions below:

  1. Open AltoUnlockPDF – go to in your preferred browser. 
  2. Upload a document – click Choose File to upload a file from your device or select a cloud storage service to import a file. 
  3. Remove the password – enter the password in the field provided and click Unlock Now!. 
  4. Get your file – wait for a few seconds while the system processes the password and click Download Now to save the document. 
  5. Continue editing – select one of four available options including the chance to import the document to 

AltoUnlockPDF allows you to unlock password-protected PDFs in just a few simple steps. What can be easier? You don't need to register, subscribe, or watch annoying ads to remove passwords from your files. In addition, perform the operation on your computer or smartphone, no matter their operating system. Avoid platforms that waste your time and money. Use AltoUnlockPDF!

BackgroundHow to unlock a PDF online


The best way to remove a password from a locked file is to unlock the PDF online. Go to, upload your document, enter the file’s password, and save your file to your device or the cloud without any additional security steps. If you don’t know the password, you’ll have to get this from the individual who applied the code.