Protect contracts, invoices, medical records, and confidential documents. Your PDF never leaves your device , everything happens in your browser.
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AES-256 encryption protects the entire file content, not just opening permissions. 100% private.
PDF is the standard format for contracts, tax returns, medical records, legal briefs, and financial statements. A single unprotected PDF sitting in your email can contain your Social Security number, bank account details, or confidential business terms.
Adobe Acrobat's built-in password protection uses older encryption (often 128-bit AES or even RC4) and has been cracked by widely available tools. FilesLock wraps your entire PDF in AES-256-GCM , the same standard used by the U.S. government for classified documents.
Unlike cloud-based PDF encryption services, FilesLock processes everything locally in your browser using the Web Crypto API. Your file is never uploaded to any server. There is nothing to intercept, nothing to leak, nothing to subpoena.
Yes. Adobe PDF encryption typically uses AES-128 and has known vulnerabilities. FilesLock uses AES-256-GCM with PBKDF2 key derivation (600,000 iterations), making brute-force attacks computationally infeasible.
The encrypted file is saved as a .locked file. To read the PDF again, decrypt it with FilesLock using the same password. This ensures the entire file content is protected, not just opening permissions.
No hard limit. Since everything runs in your browser, the practical limit depends on your device's RAM. Most modern devices handle PDFs up to several hundred megabytes without issues.
No. FilesLock runs entirely in your browser using the Web Crypto API. Your PDF never leaves your device. We have no server, no database, no way to access your files.