How to Convert Text to Binary (and Binary Back to Text)

What is binary code?

Binary is a base-2 number system — meaning it uses only two digits: 0 and 1. Every piece of data stored or processed by a computer — text, images, audio, video — is ultimately stored as a sequence of these two values.

The reason computers use binary comes down to hardware. Transistors, the fundamental building block of every processor, operate like tiny switches: they're either off (0) or on (1). Billions of these switches working in combination allow modern computers to represent and manipulate any type of information.

A single 0 or 1 is called a bit (short for binary digit). Eight bits grouped together form a byte — the standard unit for representing a single character in most text encoding systems.

How ASCII connects text to binary

A computer doesn't inherently know what the letter A is — it only understands numbers. ASCII (the American Standard Code for Information Interchange) is a mapping that bridges that gap. It assigns a unique number to every letter, digit, and symbol, so computers can agree on a shared language for text.

ASCII was first published in 1963 and became the foundation for virtually all modern text encoding. It defines 128 characters (7-bit encoding), later extended to 256 with the 8-bit variant. Here are a few familiar examples:

Notice that uppercase A (65) and lowercase a (97) have different values — binary translation is always case-sensitive. Also notice that the space character has its own binary value, just like any letter.

How to convert text to binary (step by step)

You can convert any text to binary manually by following this process:

As you can see, even converting a single word manually takes significant effort. That's exactly what our binary code translator does for you — instantly and accurately, for any length of text.

Worked example: "Hello" in binary

Let's walk through the full conversion of the word Hello — one of the most commonly searched binary examples.

01001000 01100101 01101100 01101100 01101111

A few things worth noticing in this example:

• →

  The two l characters produce identical binary (01101100) — same character, same code.

• →

  H (uppercase) and e (lowercase) produce different first bits, reflecting their different ASCII ranges.

• →

  Every group is exactly 8 bits — leading zeros are always included.

Binary A–Z reference table

The table below shows the complete binary representation for all 26 uppercase letters (A–Z) and their lowercase equivalents, along with the digits 0–9. All values use standard 8-bit ASCII encoding.

Digits 0–9 in binary

One important note: the binary code for the digit 0 (00110000) is not the same as an actual zero bit. The digit 0 still has its own ASCII value (48), and is encoded as a full byte just like any letter.

Converting binary back to text

The reverse process — binary to text — is decoding. Given a sequence of 8-bit groups, you look up each group's decimal equivalent in the ASCII table and return the corresponding character.

For example: 01001000 01101001

Result: Hi

ASCII vs Unicode: what's the difference?

ASCII handles 128–256 characters, which covers English text perfectly. But the modern web needs to support every language — Arabic, Chinese, Hindi, Japanese, emoji, mathematical symbols, and more. That's where Unicode comes in.

For standard English text, ASCII and UTF-8 produce identical binary output — a UTF-8 binary translator and an ASCII binary translator give the same result for English. The difference only matters when you introduce characters outside the basic Latin alphabet.

Frequently Asked Questions