Lock a PDF or file with a password
Add a password to a PDF (works in any PDF viewer) or lock any other file so only people with the password can open it. Files stay on your device.
Processed on your device: 0 KB. Sent to any server: 0 bytes.
Advertisement
How to use
- Add a PDF or any file.
- Choose a password and repeat it.
- Press Lock and download. To open a .lock file later, add it here again.
FAQ
Are my files uploaded anywhere?
No. Everything is processed in your browser on your own device, so your files never reach our servers.
Is it free?
Yes, free with no sign-up and no watermarks.
Is there a file size limit?
There is no fixed limit, but very large files depend on your device memory.
What happens to files that are not PDF?
They become .lock files, encrypted with AES-256. Open them on this page with the same password. If you forget the password, nobody can recover the file.
More PDF tools
NEWCompress PDFShrink to 200 KB, 1 MB or your sizeNEWSign a PDFDraw a signature and place it on a pageNEWRedact PDFBlack out passport or card numbersNEWPhoto collage makerCombine photos into one pictureNEWHEIC to JPG converterTurn iPhone photos into JPGMerge PDFCombine several files into oneExtract pagesKeep only the pages you needDelete pagesRemove what you do not needJPG and PNG to PDFTurn images into one documentRemove PDF metadataSee and erase hidden author dataPDF safety checkFind scripts and risky content
Advertisement