Binary to ASCII Code Converter

This converter works on code values, one at a time, from the table. Codes run from 0 to 127; anything above that is reported as out of range. For whole text rather than single codes, use Binary to Text; for a plain number, use Binary to Decimal.

Going the other way? Convert ASCII code back to binary →

How do you convert binary to ASCII?

Binary to ASCII code conversion reads each value as a code between 0 and 127 and looks up the character that the ASCII table gives for it.

1. Read the first value. This example uses 01000001.
2. Convert it to a decimal code if it is not one already: 65.
3. Look that code up in the table. 65 is 65.
4. Repeat for every value and join the results: 01000001 = 65.

Binary to ASCII Code Conversion Table

The codes this page works through, each with the character it stands for and the same value in hex, octal and binary. Find the code in the first column and read across; the row is the whole conversion. Codes 0 to 31 and 127 have no glyph, so the Char column shows their short name instead. This page shows the rows you need; ASCII code chart (decimal, hex, octal, binary) carries all 128.

The base this page writes, defined by the digits it uses, how a value is marked, and what each position is worth.

Worked Example: 01000001 to ASCII Code

One code value, taken from the table and written out in full. This is the same working the converter shows when you turn on "show steps".

Start with the code itself: 65. The table gives one row per code from 0 to 127, and that row is the whole answer — there is no arithmetic to get wrong, only a row to find. Reading the row across gives the same value in every base the table carries.

The row gives 65 directly. Nothing is padded and nothing is rounded, so a code either has a row or it is out of range — and the converter says which. That is the difference between a lookup and a calculation, and it is why the answer here can be checked by eye against the table above.

Check it in reverse

The value looks the same read backwards. 65 maps to code 65, and code 65 maps to 01000001 — the table is a two-way lookup, not a calculation, so no rounding or padding can change the answer. To verify the result by hand, write those ASCII codes back in 8 bits and compare it with the code you started from.

Worked examples: binary to ASCII code

Each example gives the value first, then the working. Click a value to load it in the converter.

Every example above reverses exactly — write the same codes back as 8-bit values.

What Changes the Code Output?

Values above 127

A value above 127 is out of range and the converter says so rather than guessing. Codes 128–255 belong to extended sets such as Latin-1, not to ASCII, so there is no single right character for them. all 128 ASCII codes and their characters lists every code that is in range.

Which base the code is written in

The same code can be typed as decimal, hex, octal or binary, and the base selector says which one you mean. 65, 41, 101 and 01000001 are all the letter A. Pick the wrong base and you look up a different row.

Control codes and printable codes

Codes 32 to 126 are printable characters; 0–31 and 127 are control codes. A control code has no glyph, so the table shows its short name instead — 10 is LF, 13 is CR. Converting one is valid; displaying one is not.

One code or a list

Several codes separated by spaces convert as a list, in order, and each keeps its own row. The separator is a display choice and does not change any value.

Binary to ASCII Code in Code

The same rule in one line. Both take code values and return the characters.

Python: bytes(int(g, 2) for g in s.split()).decode('utf-8')

JavaScript: new TextDecoder().decode(new Uint8Array(s.split(/\s+/).map(g => parseInt(g, 2))))

Common Mistakes

• Typing text where a code value belongs. The converter reads 72 as one code, not as the characters 7 and 2 — for whole text use convert binary to text.
• Reading a code in the wrong base. 41 is A in hex and ) in decimal.
• Expecting a character above 127. That value is outside ASCII and the answer depends on which extended set is meant.
• Dropping the padding on a fixed-width code, so a list of codes can no longer be split apart.

Frequently Asked Questions

Related Conversions

• Binary also converts to text by the same lookup — convert binary to text.
• Binary also converts to decimal by the same lookup — bin to dec by weighted sum.
• Binary also converts to hex by the same lookup — bin to hex nibble by nibble.
• If your input is hex rather than binary, convert hex bytes to ASCII codes instead.
• If your input is text rather than binary, convert text to ASCII code instead.
• If your input is ASCII codes rather than binary, ASCII code to character lookup instead.

The rest of the family sits on the rest of the binary converters.