Binary, text and ASCII converter

From characters to bits

Computers don't store letters; they store numbers. The letter A is the number 65, which in binary is 01000001 — eight bits, one byte. This converter walks that chain in both directions: it encodes your text to UTF-8 bytes and shows each as an 8-bit group (Text → Binary), or as the raw decimal code of each byte (Text → ASCII), and reverses either one back into readable text.

ASCII, UTF-8 and multi-byte characters

Original ASCII only defined codes 0–127, enough for English letters, digits and basic punctuation — every one of those fits in a single byte. Anything beyond that (accented letters, €, CJK characters, emoji) is encoded by UTF-8 as a sequence of two to four bytes. That's why typing é or 😀 produces several 8-bit groups, not one: you're seeing the actual byte sequence a file or network packet would carry, which is what makes this faithful for real-world data rather than plain ASCII only.

What the decoder accepts

Decoding is forgiving about formatting. Binary → Text ignores all whitespace and regroups the stream into 8-bit bytes, so 0100100001101001 and 01001000 01101001 both decode to “Hi”. ASCII → Text takes numbers separated by spaces or commas, each a byte value from 0 to 255. If a group isn't valid binary, or a number falls outside that range, the tool tells you exactly which token is wrong instead of producing garbage.

When this is handy

Reading bytes as bits helps when you're learning how encoding works, debugging a low-level protocol or wire format, or unpicking a CTF puzzle that hides text in binary. To convert whole numbers between bases instead of text, use the number base converter; for byte-level hex, the hex converter.