The Short Answer

If you know the PDF's password, or the file only blocks editing, copying or printing, you can unlock it in under a minute with Unlock PDF. Upload the file, enter the password if one is asked for, and download an unlocked copy. The file is processed in your browser, so it is never uploaded to a server.

Why a PDF Will Not Let You Edit It

A PDF can be protected in two different ways, and they need different fixes:

An open password. You cannot even view the file until you type the password.
A permissions restriction. The file opens normally, but editing, copying text or printing is switched off.

Most "I can't edit this PDF" problems are the second kind. The author set a restriction, and the viewer you are using respects it.

How to Unlock a PDF in Your Browser

Open Unlock PDF.
Select your PDF. If it has an open password, the tool asks for it.
Enter the password. If the file only has restrictions, no password is needed.
Click the unlock button and download the new copy.
Open the unlocked copy in Edit PDF, or any editor, and make your changes.

Your original file is not changed. You get a separate unlocked copy.

What If You Do Not Know the Password?

Be careful here. A strong open password cannot be removed by any legitimate tool. Websites that promise to "crack any PDF password" for free are either guessing common passwords or are not safe to use.

If you do not know the password:

Ask the person or company that sent you the file.
Check the email or message where you received it. Passwords are often sent separately.
Try passwords you normally use for that sender, such as a date of birth or an account number, if they gave you a hint.

PDF Section only unlocks files where you already have the password, or where the lock is a permissions restriction.

Is It Legal to Unlock a PDF?

Unlocking a file you own, or one you have permission to edit, is fine. Do not remove restrictions from documents to get around copyright or to use something you are not allowed to use. This is general information, not legal advice.

Why Unlock It Locally

Locked PDFs are often contracts, financial statements or personal records, and you are about to type their password into a website. With a tool that runs in your browser, neither the file nor the password is sent anywhere. See why uploading private PDFs is risky.

Quick Answers

Will the unlocked file look the same? The pages and text stay as they were. You are removing the protection, not changing the content.
Can I unlock a scanned PDF? Yes, but you can only edit the text if it is real text. For a scan, run OCR PDF first.
Can I lock it again afterwards? Yes. Use Protect PDF to add a new password.

How to Unlock a PDF for Editing (Free, Without Uploading It)