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How to Use AES File Encryption Tool

Encrypt file content to Base64 or decrypt Base64 ciphertext back to binary download.

Step 1

Choose File Encryption or Decryption

Use encrypt mode for files/plaintext and decrypt mode for Base64 ciphertext input. This tool uses authenticated encryption with AES-GCM, which provides confidentiality and integrity protection. For mode details, review NIST SP 800-38D (GCM).

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Encrypt: upload a file or type text, then get Base64 ciphertext output.
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Decrypt: paste Base64 ciphertext and download restored binary bytes.
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Use sample to verify your environment before processing real data.

Example: Plain File Content

invoice_id=INV-10092
amount=129.50
currency=USD
Step 2

Configure AES Mode, Key, and IV

Provide AES key/IV in hex format or use auto-regenerated values. For AES-128 use 16-byte keys, and for AES-256 use 32-byte keys. Generate fresh random values for every encryption operation using strong sources like crypto.getRandomValues().

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AES-128 key: 32 HEX characters.
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AES-256 key: 64 HEX characters.
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IV must match the implementation expectation in your backend workflow.

Example: AES-256 Key/IV (HEX)

key: 4a1f80f6bd8a47de57c2f695f9f9329e65c2289b8cdf8a5df3d0579f3a5a6bf1
iv:  6c85aab3533cb306a9fd35a0c7606f87
Step 3

Copy Output or Download Binary

Copy Base64 output for API transport or download decrypted binary output for local restore. For encoding interoperability, use standard Base64 format as defined by RFC 4648.

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Copy encrypted Base64 into API test clients and environment variables.
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Download decrypted output as a binary file for verification.
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Keep ciphertext and mode metadata together to avoid future decryption mismatch.

Example: Encrypted Base64 Output

xyt5LZ2qWf2aQgKkz8MqMSuYVabSx9mIf+Wxg3r6L0g3mZsu0vM=
Step 4

Follow Secure Storage Practices

Avoid storing plaintext keys in logs, source code, or ticket comments. Use a proper secrets manager and follow OWASP cryptographic storage guidance plus implementation notes from Web Crypto API.

Frequently Asked Questions

Can I encrypt real files with this page?

Yes. You can upload a file, encrypt it to Base64, and later decrypt it back to binary output.

Why does decryption fail with correct key length?

In AES-GCM, key, IV/nonce, and ciphertext must all match exactly. Any mismatch or modified ciphertext will fail authentication.

Is AES-GCM better than CBC for file encryption?

GCM is generally preferred for new systems because it includes authentication and tamper detection.

Does this upload my files to a server?

Encryption and decryption are performed in-browser. The file processing flow is client-side.

Can I use this output with backend services?

Yes, as long as the backend uses the same mode, key size, IV/nonce, and encoding format.

What should I store along with encrypted data?

Store ciphertext plus metadata such as mode and IV/nonce. Keep encryption keys in secure key management systems and avoid key reuse patterns.

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