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Password protect PDF

Lock a PDF with a password and choose whether it can be printed, copied or changed. Free, with no account or uploads.

Choose a password to open it, and what it may be used for. The file never leaves your device.

Drop a PDF to lock it with a password

Any PDF. Choose a password and what the file may be used for; it is locked with AES-256.

  • PDF
  • Locked PDF
  • JPG
  • PNG
  • WebP
  • HEIC
  • AVIF
  • TIFF

Stays on your device · up to 100 files, 500 MB together

How it works and help

How it works

  1. 1Add your PDFOne file, or several to lock as one.
  2. 2Choose a passwordAnd whether it may be printed, copied or changed.
  3. 3Lock and downloadThe password is asked for whenever the file is opened.
Watch a 1-minute tourOr follow the steps written under it

A little help along the way

Watch the tour, or follow the same steps below. Every option is explained underneath.

1 min 11 s, no sound. On-screen captions describe each step; the same steps are written out here.
  1. Add your PDFsDrop PDF files and pictures, choose them from your device or paste them. You can add more at any time, or try the samples.
  2. Put them in orderDrag a file, use its arrow buttons, or sort the list by name or date. Type the pages you want from a file, such as 1-3, 7.
  3. Arrange single pagesOpen the Pages view to select pages and drag, turn, copy or remove them. Every change can be undone.
  4. Organise the resultMost people can skip this. Under More options, choose a file name and how bookmarks are kept, add a contents page, set a password, or get the pages ready for printing.
  5. Merge and checkPress Merge PDF. The card says what was made, such as “2 files joined”, with its pages and size. Read it here or open it in a new tab to look through it before you keep it.
  6. DownloadPress Download PDF. Nothing is uploaded: everything runs in your browser.

Questions people ask

How strong is the lock?
The file is encrypted with AES-256, the strongest lock the PDF standard has. Anyone who opens it is asked for the password; without it the pages cannot be read.
Can I stop people printing or copying from it?
Yes. Switches allow or stop printing, copying text and pictures, and changes, with an optional second password that lifts those limits. Readers are asked to respect them, but not every program does.
What if I forget the password I set?
Then the file cannot be opened, here or anywhere: the password is not stored, sent or kept by KeepSimp. Keep it somewhere safe, and keep the file without a password too.
Can I lock several PDFs into one file?
Yes. Add them all and they are joined in the order you set, then locked with one password. Add one file to lock just that file.

This page is the PDF merger, opened for this one job; every other tool it has is one press away. Each of its settings is explained on the PDF merger's own page.

Read the step-by-step guide

Guides

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