PROTECT PDF
Protect PDF
Protect PDF files with a password. Encrypt PDF documents to prevent unauthorized access.
Drop one PDF file here
or
FAQ
Will the protected PDF look the same as the original?
Yes, the content stays the same. If needed, add page numbers before protecting the file so your final version is fully formatted first.
Yes. Protect PDF is free to use with no account creation required.
No. The entire protection process — including rasterizing the PDF pages and applying the encryption — runs locally in your browser tab. Your file bytes never leave your device. There is no upload, no cloud processing, and no server involvement of any kind. This is especially important for sensitive documents.
Yes. flipp uses jsPDF's AES-based encryption which produces a standard encrypted PDF. The password prompt will appear in Adobe Acrobat Reader, Adobe Acrobat Pro, Apple Preview on macOS, Google Chrome's built-in PDF viewer, and most mobile PDF applications on iOS and Android.
Yes — and in fact flipp is safer than most online PDF protection tools precisely because your file never leaves your browser. Uploading sensitive documents to cloud-based PDF services means your data passes through third-party servers, which carries inherent privacy risk. With flipp, the file remains entirely on your device throughout the process.
There is no server-side upload cap because files are processed locally. The practical limit depends on available memory and browser performance on your device.
No. This page is for adding password protection. Use a dedicated unlock workflow if you need to remove encryption from a PDF you own.
Yes. The output stays in standard PDF format and can be stored, shared, and opened in compatible readers that support encrypted PDFs.
No. The encryption workflow runs entirely in your browser without any desktop app, plugin, or extension.