CONVERTER · MATH · NUMBER SYSTEMS
Every letter you type is a number underneath. At the default, “Hi” becomes 01001000 01101001 — H is 72, i is 105, each written as one 8-bit byte. Flip the direction to paste binary back and decode it. The converter handles the full printable ASCII range, space-separated bytes, and validates every byte before it decodes.
Text mode turns each character into its 8-bit binary code, separated by spaces. Binary mode reads groups of 8 bits back into characters; it accepts space-separated bytes or one continuous run, and reports empty input, non-binary characters, and incomplete bytes as errors instead of guessing.
Setup: text “Hi”, direction text to binary.
Line 1 — look up each character. H is ASCII code 72; i is code 105.
Line 2 — convert to binary. 72 in binary is 1001000, padded to 8 bits: 01001000. 105 is 1101001, padded: 01101001.
Line 3 — join with spaces. The result is 01001000 01101001 — 16 bits for a 2-character word.
Line 4 — check the round trip. Switch direction, paste the binary back, and the converter returns “Hi”. If a byte is short or contains a 2, it reports the error instead of decoding garbage.
| Character | Decimal code | 8-bit binary | Note |
|---|---|---|---|
| A | 65 | 01000001 | Uppercase letters run 65–90. |
| a | 97 | 01100001 | Lowercase letters run 97–122; exactly 32 above uppercase. |
| 0 | 48 | 00110000 | Digits run 48–57. |
| (space) | 32 | 00100000 | The space character itself is a byte, not a separator here. |
| H | 72 | 01001000 | First byte of the default example. |
| i | 105 | 01101001 | Second byte of the default example. |
| ! | 33 | 00100001 | Punctuation lives in the 33–47 and 58–64 ranges. |
| ~ | 126 | 01111110 | The last printable ASCII character. |
| Output | Formula | What it means |
|---|---|---|
| Binary for a character | ASCII code in base 2, padded to 8 bits | H (72) → 01001000; padding keeps every byte the same width. |
| Binary for a word | one byte per character, space-separated | “Hi” → 01001000 01101001 — 16 bits total. |
| Text from binary | each 8-bit group back to its ASCII code | 01101001 → 105 → i. |
| Byte count | characters × 1 | ASCII text is 1 byte per character — unlike Unicode, where characters can take more. |
This converter covers printable ASCII only (codes 32–126). It does not handle accented letters, emoji, or other Unicode characters — those need UTF-8, where a character can occupy multiple bytes, and they are reported as errors here rather than silently mangled. Control characters (codes 0–31) and delete (127) are likewise excluded. Binary input must use only 0 and 1, in groups of exactly 8 bits; anything else is reported as an error with the offending group named.
Bright Side Kit. "ASCII to Binary Converter: Text to 8-Bit Binary Tool." https://brightoolbox.com/ascii-to-binary/ Accessed October 24, 2026.Data sources01001000 01101001. H is ASCII code 72, which is 01001000 in 8-bit binary; i is code 105, which is 01101001. Each character becomes exactly one byte.
Because a byte is 8 bits, and ASCII fits in one byte. Printable ASCII codes run 0–127, which needs at most 7 bits, but computers store data in 8-bit bytes, so the binary is padded with a leading zero to a full byte. That padding is what makes decoding unambiguous.
Yes — switch the direction to Binary → Text. Paste space-separated bytes, or one continuous run of bits in a multiple of 8, and the converter decodes them. Groups that are not 8 bits, or that contain characters other than 0 and 1, are reported as errors.
Because they are not ASCII. This tool covers printable ASCII only (codes 32–126). Accented letters and emoji live in Unicode and need UTF-8 encoding, where one character can take several bytes. Converting them as if they were ASCII would produce wrong output, so the converter says so instead.
01000001. A is ASCII code 65. Lowercase a is code 97, or 01100001 — exactly 32 higher, which is why flipping one bit (the 32’s place) toggles a letter’s case in ASCII.
One byte per character in ASCII. “Hi” is 2 bytes, a 10-letter word is 10 bytes, and a space counts as a character too. That is why file sizes in plain text are so easy to estimate: characters roughly equal bytes.
ASCII is the code; binary is how the code is written. ASCII assigns each character a number (A = 65). Binary is the base-2 way of writing that number (65 = 01000001). This converter translates between the character and its binary number, not between two different alphabets.
Because ASCII codes fit in 7 bits. Some tools drop the leading zero and show H as 1001000. This converter keeps the full 8-bit byte, because real computers store and transmit whole bytes — and because 8-bit groups are what decoding expects.