PDF Verschlüsseln / Entschlüsseln

Schützen Sie ein PDF mit einem Passwort oder entfernen Sie den Schutz

Ziehen Sie ein PDF hierher oder klicken Sie zum Auswählen

Maximale Dateigröße: 128 MB

Die Verarbeitung erfolgt lokal in Ihrem Browser. Ihre Dateien verlassen niemals Ihren Computer.

PDF mit Passwort verschlüsseln — AES-256-Schutz im Browser

Add password protection to any PDF using AES-256 encryption, the strongest commercially-available PDF encryption. Your PDF stays in your browser during the encryption process — only the encrypted result leaves your device when you save. No upload, no sign-up, no daily limits.

100% FreeNo UploadNo Sign-upAES-256 Encryption

Ähnliche Suchanfragen

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Anleitung

  1. Drop Your PDF: Drag any PDF in. Already-encrypted PDFs are detected — decrypt first if needed using our Unlock tool, then re-encrypt with new credentials.
  2. Choose Encryption: Pick algorithm: AES-256 (recommended, strongest) or AES-128 (broader compatibility). Set a strong password (we don't enforce complexity rules, but recommend 12+ characters with mixed case, numbers, symbols).
  3. Set Permissions: Optional: restrict actions on the PDF even with the password. 'Restrict printing', 'Restrict copying of text', 'Restrict modifications' — these are honored by compliant readers like Adobe and Preview.
  4. Encrypt & Save: Click 'Encrypt'. pdf-lib + the Web Crypto API encrypt the PDF in your browser. Saves as a new file with the encryption metadata. The original PDF is untouched.

Warum Dieses Tool Wählen

  • 100% Local Processing: Files are processed entirely in your browser using JavaScript — never uploaded to any server.
  • No Limits: No file count or file size restrictions. Process as many files as your device can handle.
  • No Sign-up: Free forever, no account needed, no email required. Open the page and start.
  • Private by Design: Nothing is sent to any server. Close the tab and your files are gone forever.

Häufige Fragen

How do I add a password to a PDF?

Drop your PDF into our PDF Encrypt tool, choose encryption strength (AES-256 recommended), set a strong password, optionally restrict permissions (printing, copying, modifying), and click 'Encrypt'. The encrypted PDF downloads with your password required to open. Everything happens in your browser — no upload.

Is AES-256 strong enough for commercial use?

Yes. AES-256 is the strongest PDF encryption standard, used by banks, government agencies, and Fortune 500 companies. As of 2026, no practical attack exists. Combined with a strong password (12+ mixed characters), AES-256 encryption provides protection sufficient for confidential commercial documents, legal filings, and medical records.

Can recipients open the encrypted PDF in any reader?

Yes — AES-encrypted PDFs are universally supported. Adobe Acrobat, Preview (macOS), Chrome PDF viewer, mobile PDF apps, and all major readers open these files with the correct password. AES-128 has slightly broader compatibility but slightly weaker protection; AES-256 is preferred for new documents.

Will my PDF be uploaded?

No. Encryption runs entirely in your browser via pdf-lib and the Web Crypto API. The decrypted PDF and your password never leave your device — only the encrypted result saves locally. Even if you lose your password, the original is gone (since it was never uploaded).

Can I set different passwords for opening vs. editing?

Yes. PDF encryption supports two passwords: an 'open password' (required to view the document) and an 'owner password' (controls editing/printing/copying permissions). Most users just need the open password. For sensitive documents where you want recipients to view but not edit without permission, set both.

What happens if I forget the password?

Our tool cannot recover forgotten passwords — neither can anyone else, given proper AES-256 encryption. This is by design (for your security). If you forget the password, the encrypted PDF is effectively inaccessible. Always store the password in a password manager or write it down in a secure location.

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NordPass

Nachdem Sie Ihr PDF mit einem Passwort geschützt haben, speichern Sie es in NordPass, damit Sie es nie selbst merken müssen.

Starke Passwörter nutzen nichts, wenn sie in einer Notes-App liegen — ein Passwortmanager verschlüsselt sie und hält sie für Autofill bereit.

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