PDF900

PDF schützen

PDF mit Passwort verschlüsseln.

Lokal verarbeitet — Dateien bleiben auf Ihrem Gerät

Dateien hier ablegen oder klicken zum Auswählen

Max. 50 MB pro Stapel

Password-protect PDF online with AES-256 encryption — free, local, your password never leaves your device.

  • AES-256 encryption
  • Local in browser
  • Password never sent to servers

Lock PDFs Before You Send Them

Protect PDF encrypts your document so only people with the password can open it — encryption runs locally.

Share contracts and personal records with confidence. Set a strong password, encrypt the PDF in your browser, and send the file and password through separate channels.

PDF900 never receives your password or unencrypted file contents when using local protect — privacy by architecture, not policy alone.

Why protect with PDF900

AES-256

Industry-standard encryption via @pdfsmaller/pdf-encrypt.

Local keys

Password stays on your device during encryption.

Simple workflow

Upload, set password, download protected PDF.

How to password-protect a PDF

  1. 1

    Upload the PDF you want to protect.

  2. 2

    Enter a strong password recipients will need to open the file.

  3. 3

    Click “Protect PDF” and wait for local encryption.

  4. 4

    Download protected.pdf and share the password securely.

Protect PDF benefits

  • Contract Pack

    Final step before sending signed contracts.

  • No cloud keys

    Local encryption — we don't store passwords.

  • Free to use

    No paywall for basic protection.

  • Pair with watermark

    Mark and lock documents together.

Häufig gestellte Fragen

What password should I use?
Strong, unique, shared securely with recipients only.
Can PDF900 see my password?
No — encryption is local.
Remove password later?
Use Unlock PDF (coming soon) with the correct password.
Is it safe?
Yes — AES-256 with local processing.

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