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Numbers, Units & Calculators

Bitwise AND Calculator

Apply a repeating key with bitwise AND to bytes from text. Review decimal byte values.

Tool workspace

Your input stays in this browser.

Add the required input to continue.

Needs input

You can run the tool again after any change.

Enter literal text. Characters through U+00FF use one byte each. Any other character makes the whole input use UTF-8.

Options

Your result appears here

Apply a repeating key with bitwise AND to bytes from text. Review decimal byte values.

This tool runs open-source code from CyberChef by GCHQ (Apache License 2.0). See open-source credits.

Bitwise AND Calculator keeps a bit only when both the input byte and the corresponding key byte contain that bit. It converts source text into bytes before the operation. The result lists decimal byte values.

The result lists decimal byte values from 0 through 255. Copy and Save preserve the array representation.

  • Inspect a small byte transformation with a known input and expected result.
  • Compare repeating key bytes with ASCII input bytes.
  • Check a step before adding it to a recipe.

Instructions

  1. Enter literal text in Text input. Start with ABC.
  2. Choose Hex under Key format and enter 0f in Key. The key repeats across the input bytes.
  3. Review the decimal byte array. The example produces [1,2,3]. Copy or save the result.

Example

Input: ABC

Settings: Key format Hex; Key 0f

Result: [1,2,3]

An empty Key acts as byte 0. It clears every byte and returns [0,0,0].

Limits

  • Text input preserves literal characters. For example, 41 means two text bytes, [52,49], rather than hexadecimal byte 0x41.
  • Characters from U+0000 through U+00FF use one byte each. Any other character makes the whole input use UTF-8.
  • For example, é becomes [233], while éĀ becomes [195,169,196,128]. These values describe this tool's input conversion.
  • Key format changes only the key. An empty key acts as byte 0; it leaves addition and subtraction unchanged but clears AND results.
  • Use values from 0 through 255 for Decimal keys.
  • The source field does not parse hexadecimal byte pairs. For binary input, use Hex Decoder before this operation in the recipe workspace.
  • The result is a byte array, not a Unicode code-point list. These byte operations do not provide secure encryption.

Questions

Does Text input read hexadecimal numbers?

No. It reads literal text, including spaces and line breaks. For example, 41 becomes input bytes [52,49], not hexadecimal byte 0x41.

How does the tool convert non-ASCII text into bytes?

Characters from U+0000 through U+00FF use one byte each. Any other character makes the whole input use UTF-8. For example, é becomes [233], while éĀ becomes [195,169,196,128].

Does Key format change the source input?

No. Key format applies only to Key. Choose Hex, Decimal, Binary, Base64, UTF8, or Latin1. The key bytes repeat across the input. Use values from 0 through 255 for Decimal keys.

What happens with an empty key?

An empty key acts as byte 0. Bitwise AND with 0 returns 0 for each input byte.

How do I use binary data and save the result?

For binary input, use Hex Decoder before this operation in the recipe workspace. The standalone result lists decimal byte values. Copy and Save preserve the array representation; they do not convert it to readable text.