Password Protect PDF
Set an open password on a PDF and optionally restrict printing, copying and editing. The first run downloads a ~2MB encryption module (WASM); everything happens in your browser.
100% browser-based · files never uploaded
Drag files here, or click to choose
Drag, click to choose, or paste a single file with Ctrl+V · Up to 50.0 MB per file
Settings
The first encryption loads qpdf WASM (about 2MB) from this site, so please keep your connection open.
🔒 Your files never leave your browser
Related tools
- Unlock PDFRemove PDF protection using a password you already know, so the file can be edited or merged. This site cannot crack or guess unknown passwords; the first run loads qpdf WASM.
- Sign PDFPlace a text, image or handwritten signature in the bottom-right corner of the page you choose (a visual signature, not a CA digital certificate).
- Redact PDFDrag over the areas that hold sensitive information and black them out — processed locally in your browser, files are never uploaded.
Frequently asked questions
- Is the file uploaded when it is encrypted?
- No. Encryption happens locally in your browser.
- What if I forget the password?
- Nobody can recover it for you — store it safely. If you do know the password, use "Unlock PDF".
- Can it block printing?
- You can restrict printing, copying and similar permissions (whether a reader honours them is up to that reader).