Text to Binary Converter

Each character in your input gets converted to its numeric code point and then expressed as a binary, hexadecimal or octal string. ASCII characters use 7 bits but the tool pads to 8 bits per byte for readability, so 'A' (decimal 65) becomes 01000001 in binary, 41 in hex, 101 in octal. Pick a format from the pills at the top, toggle 'Spaces between bytes' on or off, and the output regenerates instantly.

For inputs of 20 characters or fewer, a reference table appears below showing each character alongside its binary, hex and decimal values. This is the easy way to check that a particular byte is what you expected. The conversion runs entirely in your browser using JavaScript's charCodeAt(), so even confidential snippets stay local. Pasted text up to a few hundred kilobytes converts without delay.

Plain English text is 7-bit ASCII, so 'Hello' produces five clean 8-bit bytes. The moment you include an em dash, an accented vowel, an emoji or any non-Latin character, you are in UTF-8 territory and a single visible character can occupy 2, 3 or 4 bytes. The tool uses charCodeAt() which returns UTF-16 code units, so the £ symbol comes out as a single 16-bit value (00000000 10100011), and emoji like the rocket consist of a surrogate pair where each half has its own binary representation.

If you need true UTF-8 byte-by-byte output (for example, to verify what an HTTP server sees), encode your string with TextEncoder first in a developer console, or paste only ASCII characters. For the typical use cases (homework, learning binary, encoding short messages for fun), the default behaviour is exactly what you want. ASCII codes 0-127 are identical across all encodings, so 'Hello World' is unambiguous.