About Binary to ASCII Converter
This converter turns binary codes into ASCII text. Each group of 8 binary digits is one byte, and the bytes are decoded as UTF-8, which matches ASCII for codes 0 to 127. It is free, needs no sign-up and runs in your browser, so nothing you enter is uploaded.
The word Hello is 01001000 01100101 01101100 01101100 01101111 in binary. Plain English letters, digits and punctuation take one byte each, so the output has one group of 8 binary digits per character.
Characters outside ASCII take more than one byte in UTF-8. The letter é is 11000011 10101001 and the Bangla letter ক is 11100000 10100110 10010101, so a single character can produce two or three groups.
Separate the bytes with spaces, commas or semicolons, or paste one long run of digits and the converter splits it into 8-digit groups. A 0b prefix is accepted. Each byte must be a value from 0 to 255.
ASCII is a 7-bit code with 128 characters, so every ASCII character fits in one byte whose top bit is 0. Bytes above 127 are not ASCII; this converter reads them as part of UTF-8 text.
How to use Binary to ASCII Converter
- Choose the Numbers mode to convert a value, or Text and ASCII to convert text.
- In Numbers mode, pick the base you are starting from, then type the number. Use a minus sign for negatives and a point for a fraction.
- Pick the target base. The result for binary, octal, decimal and hexadecimal appears together, with the target base and an extra base you can choose.
- Show steps is on by default. Turn on Group digits to split long results into blocks of 4 (binary and hex) or 3 digits.
- Turn on two’s complement and pick 8, 16, 32 or 64 bits to see how a signed whole number is stored.
- In Text mode, choose encode or decode and the base (2, 8, 10 or 16), then enter text or the bytes to decode.
Features
- Any base from 2 to 36, with results shown in binary, octal, decimal and hexadecimal together.
- Negative numbers and fractions, with a repeating block detected and shown in brackets, such as 0.0(0011) for 0.1.
- Step-by-step working for fractions by repeated multiplication, as well as for whole numbers.
- Big integers, with no 53-bit limit.
- Two’s complement for 8, 16, 32 and 64-bit signed integers.
- Step-by-step working for whole numbers: place values for the source base and repeated division for the target.
- Digit grouping in blocks of 4 or 3 for readable bit patterns.
- Text to and from UTF-8 bytes in bases 2, 8, 10 and 16.
- An ASCII table for codes 0 to 127 with decimal, hex, octal, binary and the character.
- Prefixes 0b, 0o and 0x accepted, and spaces, commas and underscores ignored.
- A copy button on each result.
Worked examples
01001000 01100101 01101100 01101100 01101111 gives Hello
01001000 01101001 gives Hi
Hello as bytes
| Character | Decimal | Hex | Binary |
|---|---|---|---|
| H | 72 | 48 | 01001000 |
| e | 101 | 65 | 01100101 |
| l | 108 | 6C | 01101100 |
| l | 108 | 6C | 01101100 |
| o | 111 | 6F | 01101111 |
Capital letters A to Z in binary
| Letter | Decimal | Hex | Binary |
|---|---|---|---|
| A | 65 | 41 | 01000001 |
| B | 66 | 42 | 01000010 |
| C | 67 | 43 | 01000011 |
| D | 68 | 44 | 01000100 |
| E | 69 | 45 | 01000101 |
| F | 70 | 46 | 01000110 |
| G | 71 | 47 | 01000111 |
| H | 72 | 48 | 01001000 |
| I | 73 | 49 | 01001001 |
| J | 74 | 4A | 01001010 |
| K | 75 | 4B | 01001011 |
| L | 76 | 4C | 01001100 |
| M | 77 | 4D | 01001101 |
| N | 78 | 4E | 01001110 |
| O | 79 | 4F | 01001111 |
| P | 80 | 50 | 01010000 |
| Q | 81 | 51 | 01010001 |
| R | 82 | 52 | 01010010 |
| S | 83 | 53 | 01010011 |
| T | 84 | 54 | 01010100 |
| U | 85 | 55 | 01010101 |
| V | 86 | 56 | 01010110 |
| W | 87 | 57 | 01010111 |
| X | 88 | 58 | 01011000 |
| Y | 89 | 59 | 01011001 |
| Z | 90 | 5A | 01011010 |
Privacy: how it works
- All conversions are done by code running in your browser tab. The numbers and text you enter are never sent to Ulkaa or anyone else.
- There is no account and no sign-up, and the tool costs nothing to use.
Tips
- Use Group digits to read long binary numbers: blocks of 4 line up with hex digits.
- Pick binary to hex when you want to read bits quickly: convert each group of four on its own.
- Use two’s complement with the width of your data type, for example 8 bits for a byte and 32 bits for a typical integer.
- If a result has a repeating block in brackets, the digits inside repeat forever, so a stored value is only an approximation of it.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial and no credit card. Ulkaa Tool does the work with your own device, so there is no server bill to pass on to you.
Do I need an account?
No. There is no sign-up and no login. Open the page and use it. An Ulkaa account is not needed for anything on this tool.
Does it run in my browser?
Yes. Your numbers are processed by code running in your browser tab, on your own device.
Is my data uploaded?
No. Your numbers are never sent to Ulkaa or to anyone else. You can check this yourself by watching the Network tab in your browser developer tools while you use the tool.
How do I convert binary to text?
Split the binary into bytes of 8 binary digits, turn each into a number, and look up the character. For example 01001000 01101001 is Hi.
What does 01001000 01100101 01101100 01101100 01101111 say?
It decodes to Hello.
What is the difference between ASCII and UTF-8?
ASCII has 128 characters. UTF-8 covers all of Unicode and uses the same single bytes for the ASCII range, then two to four bytes for everything else.
More Number Base Converter pages
- Number Base ConverterConvert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36, or turn text into bytes.
- Binary to Decimal ConverterTurn a binary number into decimal, with the working shown.
- Decimal to Binary ConverterTurn a decimal number into binary, with the working shown.
- Binary to Hex ConverterTurn a binary number into hexadecimal, with the working shown.
- Hex to Binary ConverterTurn a hexadecimal number into binary, with the working shown.
- Decimal to Hex ConverterTurn a decimal number into hexadecimal, with the working shown.
- Hex to Decimal ConverterTurn a hexadecimal number into decimal, with the working shown.
- Decimal to Octal ConverterTurn a decimal number into octal, with the working shown.
- Octal to Decimal ConverterTurn an octal number into decimal, with the working shown.
- Binary to Octal ConverterTurn a binary number into octal, with the working shown.
- Octal to Binary ConverterTurn an octal number into binary, with the working shown.
- Hex to Octal ConverterTurn a hexadecimal number into octal, with the working shown.
- Octal to Hex ConverterTurn an octal number into hexadecimal, with the working shown.