AES-GCM Text Decryption Tool

Decrypt an authenticated AES-256-GCM Base64 envelope using your secret passphrase.

How It Works & Processing Standards

Decrypt an authenticated AES-256-GCM Base64 envelope using your secret passphrase.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 2,000,000 characters

AES-GCM Text Decryption Tool is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use AES-GCM Text Decryption Tool

  1. 1
    Paste EnvelopePaste the Base64 encrypted envelope text.
  2. 2
    Enter PassphraseType the exact secret passphrase used during encryption.
  3. 3
    Read PlaintextView the decrypted original text.

Common Use Cases

  • Recovering encrypted credentials, reading password-protected notes, and verifying AES envelope integrity
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