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A quick way to understand who this helps, what it solves, and where it connects next.
People adding a simple access password to documents they share by email, chat, storage links, or client handoff
Creating a browser-first protected PDF copy when the main goal is to require a password before the file can be opened
Capture protect-PDF, password-protect-PDF, and lock-PDF intent with a clear browser-first flow and visible export tradeoffs
Cleanor Labs
These sections explain the job in plain language and set expectations for what the tool should do well.
To protect a PDF, add one file, type the opening password you want readers to enter, and confirm the permission level. Protect PDF encrypts the document in your browser and exports a protected copy you can download and share. Anyone who opens it in a compatible reader will be asked for the password first.
Because the whole process runs client-side, your source PDF never leaves your device and is not stored on any server. That makes it a good fit for contracts, invoices, statements, and other sensitive documents you would not want to upload.
Keep your password somewhere safe. The protection is meant to require it before the file opens, so a lost password means a locked file with no recovery path through this tool.
This browser-first version rebuilds pages locally before encryption so the whole job can stay on-device. That keeps it private and simple, but it can flatten searchable text, fillable form fields, and annotations in the protected copy.
If you need to keep the original document fully editable and searchable, hold on to the untouched source file and treat the protected export as a share-safe copy. For most password handoffs, the flattened protected version is exactly what you want: a locked file that opens only with the password.
Short answers for the questions people usually have before trying a utility like this.
Yes. Protect PDF is free to use with no account and no upload queue. You add a password and export the locked file locally.
No. Protection happens entirely in your browser, so the source PDF stays on your device during processing and is never uploaded.
Yes. The exported PDF is meant to require the password before the file can be opened in a compatible PDF reader.
Not necessarily. This browser-first version can flatten forms and searchable text because the protected export is rebuilt page by page before encryption.
The file will stay locked. This tool does not store or recover passwords, so keep your password safe and consider retaining the original unprotected file.
Every tool on Cleanor is free with no sign-up, no credits, and no limits. Files are processed privately in your browser. Looking for on-device phone cleanup and Premium features? That lives in the Cleanor app.
Add an opening password to a PDF in the browser and export the protected version right away without sending the file to a server.