See what your text looks like as 1s and 0s
At the lowest level, every character your computer stores is a number. And every number is binary. This tool shows you that translation directly, type “A” and you get 01000001. Type “Hi” and you get 01001000 01101001. It works both ways, so you can paste binary back in and decode it to readable text.
Each character maps to its 8-bit ASCII value. Beyond basic ASCII, Unicode characters use their full code point, which might be longer than 8 bits.
What it does
- Converts text to 8-bit binary representation
- Converts binary back to text (space-separated bytes)
- Handles standard ASCII and extended Unicode
- Bidirectional, flip between modes with a click
- Instant conversion as you type
- Browser-only. Your text stays local.
How to use it
Pick Text to Binary or Binary to Text. Type or paste your input. For binary input, put a space between each byte, like 01001000 01101001 for “Hi.”
The output of 01001000 01100101 01101100 01101100 01101111 in Binary to Text mode? “Hello.”
Why learn binary?
Here’s the thing: understanding binary isn’t just an academic exercise. It’s the foundation of literally everything your computer does.
CS students: this is usually one of the first concepts you encounter. Seeing “A” as 01000001 makes character encoding click in a way that reading about it in a textbook doesn’t.
Understanding ASCII: the relationship between characters and their numeric codes becomes intuitive when you see it in binary. “A” is 65. In binary, that’s 01000001. “B” is 66 = 01000010. The pattern is right there.
Debugging low-level stuff: working with network protocols, binary file formats, or raw data? Being able to quickly check the binary representation of a string is genuinely useful.
Puzzle makers: binary-encoded messages show up in escape rooms, tech-themed scavenger hunts, and programming challenges. They look intimidating but they’re actually easy to decode once you know the trick.
Teaching number systems: binary pairs naturally with decimal and hexadecimal. Use this alongside a Number Base Converter to show how the same value looks in different bases.
For more encoding tools, check out Morse Code and ROT13: different ways of transforming text, each with their own history and use cases.
Standard ASCII characters (codes 0-127) always produce exactly 8 bits. Anything beyond that, accented characters, symbols, emojis, produces longer binary strings.
FAQ
What encoding does it use?
Unicode code points expressed in 8-bit binary. Standard ASCII characters (0-127) use one byte. Higher code points produce longer output.
How do I format binary input?
Space-separated groups of 8 digits. 01001000 01101001 decodes to “Hi.” Each group = one character.
What about special characters and emojis?
They work. Standard ASCII produces 8-bit codes. Everything else uses its full Unicode code point, which will be longer.
What’s the connection between binary and ASCII?
ASCII assigns a number to each character (A = 65, B = 66, etc.). Binary is just that number in base-2. So A = 65 = 01000001.
Is this private?
Yes. All conversion happens in your browser. Nothing transmitted.