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Unlock & Decrypt PDF Files

Remove password protection and printing/editing restrictions from PDF files locally.

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Drop a protected PDF file here to unlock
Select a password-protected PDF document from your computer

Deep Technical Insight: PDF Decryption & Trailer Catalog Re-serialization

Encrypted PDF documents contain an /Encrypt key inside the trailer dictionary, mapping to indirect objects detailing cipher specifications, key length, and permission bitmasks.

QuickPdfBox.com processes document decryption entirely inside client RAM:

  1. Cipher De-serialization: When authenticating via the standard security handler, decrypted object streams are held in Uint8Array memory buffers.
  2. Trailer Re-indexing: The /Encrypt reference key is removed from the catalog trailer.
  3. Clean Re-serialization: A fresh PDF 1.7 compliant file structure is compiled without encryption bitmasks, producing an unlocked document.
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Verified Technical Security & Privacy Standard
ISO 32000-1 PDF Standard compliant. All decryption executed inside client browser sandbox.