What password should I choose?

Any password with at least 4 characters. For sensitive documents, use a longer, unique password and share it with recipients through a separate channel than the file itself.

Can I remove the password later?

Yes — use our Unlock PDF tool with the correct password to produce an unprotected copy again.

Will the quality of my PDF be affected?

No. Adding password protection only encrypts the file — it does not re-encode or modify any content.

Can I protect a PDF that's already password-protected?

No. Unlock it first with the correct password, then protect it again with a new one if needed.

Are my files and passwords kept private?

Your file and password are used only to perform the encryption. They are deleted automatically once the download is complete and are never shared or stored long-term.

Protect PDF Online

Add password protection to a PDF so it requires a password to open. Encrypt your file in seconds.

Drop your file here, or click to browse

.pdf · max 20 MB

FloxerFile lets you add real password protection to any PDF. Set a password and we encrypt the file so it can only be opened by someone who knows it — useful for sharing contracts, invoices, or other sensitive documents over email or cloud storage. No software, no sign-up, just upload, set a password, and download.

How it works

1
Upload your PDF
Drag and drop your PDF or click to browse. Files up to 20 MB are supported.
2
Set a password
Enter the password that will be required to open the PDF. At least 4 characters.
3
Protect
Click Protect PDF. Your file is encrypted with the chosen password on our servers.
4
Download your protected PDF
Download the encrypted PDF. Anyone opening it will be prompted for the password you set.

Features

Real encryption
Your PDF is encrypted so it genuinely cannot be opened without the password — not just visually locked.
Also restricts editing and copying
Beyond the open password, the file is set to disallow editing, content copying, and annotating — while still permitting high-resolution printing, form filling, and screen-reader access for accessibility.
Content is gated, not modified
Encryption only adds a password requirement — the PDF's text, images, and links are completely unchanged, just gated behind a password.

Supported formats

.pdf

PDF (all versions)

Standard, unprotected PDF files from any source. Already password-protected PDFs are not supported — unlock them first.

Output format: .pdf

Frequently asked questions

What password should I choose?: Any password with at least 4 characters. For sensitive documents, use a longer, unique password and share it with recipients through a separate channel than the file itself.
Can I remove the password later?: Yes — use our Unlock PDF tool with the correct password to produce an unprotected copy again.
Will the quality of my PDF be affected?: No. Adding password protection only encrypts the file — it does not re-encode or modify any content.
Can I protect a PDF that's already password-protected?: No. Unlock it first with the correct password, then protect it again with a new one if needed.
Are my files and passwords kept private?: Your file and password are used only to perform the encryption. They are deleted automatically once the download is complete and are never shared or stored long-term.

Related tools

Unlock PDF

Remove password protection from a PDF so it opens without a password.

Merge PDF

Combine multiple PDF files into a single document.

Split PDF

Split a PDF into individual pages or custom page ranges.

Ready to protect your PDF?

Upload your file above and add a password in seconds.