notuploaded

Lock file with a password

Lock any file, like a scan of your passport or a spreadsheet, with a password before you email it or put it on a USB stick. AES-256 encryption, done on your device; nothing is uploaded.

Runs in your browser. Your files are never uploaded or stored.

Use a long password you don’t use anywhere else. Make a strong password

Something not working, or missing an option?

How to use Lock file with a password

  1. Choose or drop the file. A locked file switches to Unlock by itself.
  2. Type a strong password (twice to lock).
  3. Select Lock file or Unlock file to download the result.

Questions

How safe is it?

It uses AES-256-GCM with a key made from your password by 600,000 rounds of PBKDF2, the same standards banks and password managers use. A long, unique password matters most.

Are my files uploaded?

No. The tool runs inside your browser, and the page is blocked from sending data anywhere. You can check by turning off your internet connection: it keeps working.

Open-source parts

This tool uses only features built into your browser: no third-party code.

Full license texts

  • Unlock PDF Remove a PDF’s password or printing and copying limits.
  • Protect PDF Lock a PDF with a password.
  • Sign PDF Draw or type your signature and place it on a PDF.
  • Redact PDF Black out private details for good.
  • Compare PDF Spot the text differences between two PDFs.
  • Remove PDF metadata See and erase the author, software and dates hidden in a PDF.

Guides: Is it safe to upload your documents to an online converter?

Guides: How to password-protect a PDF