Zero-Knowledge File & Text Encryptor (AES-GCM 256)
Encrypt sensitive confidential files, passwords, and private notes with authenticated AES-256-GCM encryption directly inside your browser. No unencrypted data or encryption keys ever touch any network connection.
AES-256 Text & File Encryptor
Military-grade client-side encryption using Web Cryptography API & PBKDF2 password derivation.
Mask Client PII Before Pasting into ChatGPT
Two-way client-side token anonymization and 1-click restore.
⚙️ How This Tool Works Locally
When you use this tool on PrivacyKit, every byte is processed directly in your device RAM.
- 1. No Network Traffic: No HTTP POST or PUT requests are made to any server. Your internet can even be disconnected.
- 2. Modern Native APIs: Computation uses native HTML5 Canvas, Web Cryptography (SubtleCrypto), and client-side binary parsers.
- 3. Zero Footprint: Closing this browser tab immediately frees the memory buffer. No persistent cookies or caches remain.
💡 Frequently Asked Questions
How secure is AES-256-GCM encryption?
AES-256-GCM is the gold standard military and banking encryption standard. It provides both confidentiality (nobody can read the data) and authenticity (it detects if the ciphertext was tampered with).
Can PrivacyKit recover my password if I forget it?
No. PrivacyKit is 100% zero-knowledge. We have no servers, no master keys, and no backdoors. If you lose your password, the encrypted data cannot be decrypted.
How is the encryption key derived from my password?
We use the standard PBKDF2 (Password-Based Key Derivation Function 2) algorithm with 100,000 SHA-256 rounds and a fresh 16-byte cryptographically random salt to protect against brute-force attacks.
Can I encrypt large files with this tool?
Yes. Because the browser WebCrypto API utilizes native hardware acceleration, files are encrypted rapidly in device RAM.
Does encrypting a file require an active internet connection?
No. The cryptographic primitives run entirely offline in your browser.
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