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Null bytes Remover

Remove NUL (U+0000) characters from pasted text in your browser. The result is the remaining bytes as a decimal JSON array, not text.

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Remove NUL (U+0000) characters from pasted text in your browser. The result is the remaining bytes as a decimal JSON array, not text.

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

Null bytes Remover deletes every U+0000 (NUL) character from pasted text. It returns the remaining bytes as a JSON array of decimal numbers, not as text. Pasting H, NUL, i, NUL, which is UTF-16LE text read one byte at a time, returns [72,105]. Visible text such as 00 or \0 is not a NUL and stays.

The result is a JSON array of byte values with every 0 removed, such as [72,105]. Copy and Download both give that array.

  • Recover the letters of UTF-16LE text that was pasted one byte per character.
  • Count the NUL padding in a fixed-width field copied from a binary record.
  • Get the decimal byte values of a short string without its NUL characters.

Instructions

  1. Paste text that contains real NUL characters into Input. The page has no file picker and no hex input.
  2. Read the byte array. Each number is one remaining byte from 1 to 255.
  3. For ASCII text, compare the array length with the visible character count. The difference is the number of NUL characters removed.
  4. Copy or download the array. The download is JSON text, not the cleaned binary data.

Example

Input: H, NUL (U+0000), i, NUL (U+0000)

Settings: None. This tool has no options.

Result: [ 72, 105 ]

72 and 105 are the byte values of H and i. The result stays a number list; it is not converted back to text.

Limits

  • The output is never readable text. Convert the decimal byte list to characters in another step.
  • Characters up to U+00FF become one byte each. If any character is above U+00FF, the whole input is encoded as UTF-8. So é stays 233, but € becomes 226, 130, 172.
  • Removing zero bytes recovers UTF-16 text only for characters up to U+00FF. Other characters need a real UTF-16 decoder.
  • Only byte 0 is removed. Other control characters, such as U+0001 or a tab (9), stay in the array.

Questions

What does Null bytes Remover remove?

It removes actual NUL bytes from pasted text. It keeps spaces, line breaks, other control characters, and the visible text 00 or \0.

Why is the output a list of numbers?

The operation works on bytes, so it returns the remaining byte values. H, NUL, i, NUL returns [72,105]. Convert the numbers back to characters in another step.

Does removing NUL bytes decode UTF-16?

Only for characters up to U+00FF. Higher UTF-16 characters have a non-zero high byte, so removing zeros corrupts them. Use a real UTF-16 decoder for that text.

What input does Null bytes Remover accept?

Paste text into Input. This page does not provide a file picker or decode hexadecimal input. Latin1 text uses one byte per code unit. If any character exceeds 255, the entire input uses UTF-8.