Binary Text Converter
Convert text to binary, hexadecimal or ASCII decimal codes, and back again, instantly, right in your browser.
About the Binary Text Converter
Quick Answer: The Binary Text Converter translates text into binary code (8-bit zeros and ones), hexadecimal, octal, or decimal ASCII numbers, and decodes encoded streams back to human text. Features strict UTF-8 validation and custom delimiters.
At the physical level of digital silicon, every piece of software, document, image, and streaming media consists entirely of microscopic transistors holding high or low electrical charge. These two physical states represent binary digits: 0 (off/low voltage) and 1 (on/high voltage). The Binary Text Converter translates human language into machine-level representations and reverses the process with byte-accurate fidelity.
- Bidirectional multi-radix support: Convert between plain text and Binary (Base-2), Hexadecimal (Base-16), Octal (Base-8), and Decimal ASCII (Base-10).
- Custom delimiter controls: Format output with space separators, comma delimiters, continuous streams, or language prefixes (such as
0bor0x). - Universal UTF-8 handling: Built upon the native browser TextEncoder and TextDecoder APIs, ensuring emoji, accented glyphs, and non-Latin scripts round-trip without corruption.
- Strict client-side decoding: Malformed or truncated byte sequences are caught with clear diagnostics rather than silent glyph degradation.
Understanding number systems: Binary, Octal, Decimal, and Hexadecimal
Computer science utilizes four foundational radix (base) systems to represent digital data:
- Binary (Base-2): Uses only two symbols (0 and 1). While fundamental to computer hardware, long binary strings (such as
01001000) are visually difficult for human engineers to read and audit quickly. - Octal (Base-8): Uses eight symbols (0 through 7). Each octal digit represents exactly three binary bits ($2^3 = 8$). Octal was widely used in legacy computing (such as PDP minicomputers) and remains active today in Unix file permissions (for example,
chmod 755). - Decimal (Base-10): The standard human counting system using ten digits (0 through 9). In computing, decimal ASCII represents the integer ordinal assigned to each character (for example, letter “A” equals decimal 65).
- Hexadecimal (Base-16): Uses sixteen symbols (0 through 9 and A through F). Because $2^4 = 16$, exactly four binary bits (one “nibble”) map to one hex character. Consequently, an 8-bit byte maps cleanly into two hexadecimal characters (spanning
00toFF), making hex the universal format for memory addresses, cryptographic digests, and network packets.
ASCII and UTF-8 multi-byte encoding reference table
The following reference table outlines the representation of common characters across binary, hexadecimal, octal, and decimal encoding standards:
| Character | Decimal (ASCII) | Hexadecimal | Octal | Binary (8-bit) | UTF-8 Byte Length |
|---|---|---|---|---|---|
| A | 65 | 41 | 101 | 01000001 |
1 Byte |
| Z | 90 | 5A | 132 | 01011010 |
1 Byte |
| a | 97 | 61 | 141 | 01100001 |
1 Byte |
| z | 122 | 7A | 172 | 01111010 |
1 Byte |
| 0 (Digit) | 48 | 30 | 060 | 00110000 |
1 Byte |
| Space | 32 | 20 | 040 | 00100000 |
1 Byte |
| ! (Exclamation) | 33 | 21 | 041 | 00100001 |
1 Byte |
| é (Accented) | 195, 169 | C3 A9 | 303 251 | 11000011 10101001 |
2 Bytes |
| 🚀 (Rocket Emoji) | 240, 159, 154, 128 | F0 9F 9A 80 | 360 237 232 200 | 11110000 10011111 10011010 10000000 |
4 Bytes |
Step-by-step tutorial: manual text to binary conversion
Converting a character like capital “M” to binary manually follows a simple mathematical process:
- Look up the ASCII decimal value: In the standard ASCII table, “M” is decimal 77.
- Perform successive division by 2:
- 77 ÷ 2 = 38 (remainder 1)
- 38 ÷ 2 = 19 (remainder 0)
- 19 ÷ 2 = 9 (remainder 1)
- 9 ÷ 2 = 4 (remainder 1)
- 4 ÷ 2 = 2 (remainder 0)
- 2 ÷ 2 = 1 (remainder 0)
- 1 ÷ 2 = 0 (remainder 1)
- Read the remainders from bottom to top:
1001101. - Pad to an 8-bit byte: Add leading zero:
01001101.
To convert this byte to hexadecimal, split it into two 4-bit nibbles: 0100 (which is 4) and 1101 (which is 13, represented as “D” in hex). Joining them produces 4D.
Byte endianness and network byte order
When multi-byte binary sequences are stored in computer memory, two opposing architectural conventions dictate byte ordering:
- Big-Endian: Stores the most significant byte (MSB) at the lowest memory address. This matches natural human reading order from left to right. Standard internet protocols (TCP/IP) designate Big-Endian as the canonical “network byte order”.
- Little-Endian: Stores the least significant byte (LSB) first. Modern x86 and ARM processors utilize Little-Endian internally because it simplifies arithmetic logic circuits in hardware silicon.
Our client-side tool standardizes on canonical Big-Endian stream output, ensuring your binary and hexadecimal strings integrate cleanly into network packets, debugging logs, and CTF puzzle submissions.
Frequently Asked Questions
Why does one character sometimes produce multiple binary or hex groups?
Basic English letters are single-byte in UTF-8 and produce one group each, but an emoji or accented character often takes multiple bytes to encode, producing multiple groups for what looks like one character. This is standard UTF-8 behavior, not specific to this converter.
Why does the ASCII mode show values above 127?
True 7-bit ASCII only covers 0-127, but this mode works with UTF-8 byte values, which go up to 255. A value above 127 represents part of a multi-byte character rather than a standalone ASCII character, worth knowing when comparing against a strict ASCII reference table.
Why does invalid binary or hex input show an error instead of some output?
The decoder runs in strict mode, rejecting byte sequences that are not valid UTF-8 rather than silently substituting a replacement character. This surfaces a malformed or truncated input as a clear error instead of producing a decoded result that looks plausible but is actually wrong.
Does this tool send anything I type to a server?
No. All encoding and decoding happens locally using the browser built-in TextEncoder and TextDecoder APIs. Nothing typed or pasted in leaves the browser tab.
What is the difference between the binary, hex, and ASCII modes?
All three represent the same underlying bytes differently. Binary shows the literal bits, hex shows the same bytes more compactly using two characters per byte, and ASCII decimal shows each byte as a plain base-10 number. Which one to use depends on which format the destination expects.
Can this decode hidden binary or hexadecimal messages from puzzles?
Yes, that is one of the more common uses. Pasting a binary or hex string into the corresponding to Text mode decodes it instantly, much faster and less error-prone than converting each group by hand.
How does UTF-8 represent multi-byte characters like emojis in binary?
In UTF-8 variable-length encoding, standard ASCII characters use 1 byte (8 bits starting with 0), while emojis and international scripts require 2, 3, or 4 bytes. For instance, the rocket emoji (🚀) encodes to 4 bytes: F0 9F 9A 80 in hex, which converts to four 8-bit binary groups.
What delimiter formats are supported when decoding binary or hex?
The binary decoder accepts bits separated by spaces, commas, or continuous byte sequences. The hexadecimal decoder supports space-delimited pairs (48 65 78), hyphenated pairs, or contiguous hex strings (486578) with case-insensitive letters (A-F or a-f).
What is the difference between Big-Endian and Little-Endian byte order?
Byte endianness dictates whether the most significant byte (Big-Endian) or least significant byte (Little-Endian) is stored first in computer memory. Network protocols and standard UTF-8 text streams follow Big-Endian order, reading bytes from left to right as displayed in this tool.
Can I convert Base64 strings using this converter?
This tool focuses specifically on binary (base-2), hexadecimal (base-16), and decimal ASCII (base-10). For Base64 encoding and decoding, you can use our dedicated Base64 Encoder & Decoder tool located in the Coding category.