🔐 Cryptography & Encryption

AES-CTR Encrypt & Decrypt

AES-CTR encryption and decryption for compatibility testing.

Free toolClient-sideNo account required

Key (Base64URL, 32 bytes)

Counter (Base64URL, 16 bytes)

Plaintext

Result

Ready.

AES-CTR provides confidentiality only and requires a never-reused counter/nonce for a given key. Prefer AES-GCM for new applications. All processing is performed locally in your browser.

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How to use this calculator

What to enter

Enter or select the following as requested: Key (Base64URL, 32 bytes); Counter (Base64URL, 16 bytes); Plaintext. Follow the units, valid ranges, examples, and options displayed beside each field.

What the result means

The output is the transformed value, generated snippet, lookup result, or technical measurement produced from the supplied input and selected options. Review the output before using it, and verify compatibility with the target system or format.

When to use it

Use this as a developer or technical utility for encoding, conversion, validation, calculation, or reference. Do not treat a successful transformation as proof that a system is secure or that generated code is production-ready.