Free Binary Converter - Encode & Decode Binary, Hex & Octal (2026)

Q: How do I convert binary to text?

Each 8-bit group represents one byte. The tool converts each group to its decimal value using base-2 arithmetic, then maps it to the corresponding ASCII character. For example, 01001000 = 72 = H.

Q: What is hexadecimal used for?

Hex is a compact way to write binary values - every byte maps to exactly two hex digits. You encounter hex in CSS color codes, memory addresses, file magic bytes, and network protocol documentation.

Q: Where is octal still used?

Octal is most common in Unix/Linux file permission notation - chmod 755 uses octal where each digit encodes three permission bits. It also appears in C numeric literals starting with 0.

Q: What is the difference between binary, hex, and octal?

All three represent the same underlying byte values in different number bases. Binary (base 2) uses digits 0–1 and produces 8 characters per byte - the most verbose but most granular. Hexadecimal (base 16) uses digits 0–9 and A–F and produces 2 characters per byte - compact and widely used in debuggers and protocol docs. Octal (base 8) uses digits 0–7 and is mainly seen in Unix chmod permission notation.

Q: Can I use this as a binary-to-ASCII converter?

Yes. Select "Encoded → Text" and "Binary" mode, then paste your binary string. The tool converts each 8-bit group to its decimal value and maps it to the corresponding ASCII or Unicode BMP character. It handles space-separated, comma-separated, and contiguous no-separator binary input automatically.

Convert text to binary, hexadecimal, or octal - and back again - instantly in your browser. No libraries, no uploads, no sign-up required.

Binary · Hex · Octal · ASCII - bidirectional - space, comma & no-separator modes - all free

Used by CS students, educators, and developers for encoding exercises, protocol debugging, and data representation coursework.

Direction:

Mode:

Separator:

Text to encode

Paste your input and click Convert.

Last updated: June 5 2026

Reviewed by the QuickTooly Team

Binary Converter Guide

What Is Binary Encoding and Why Does It Matter?

Binary encoding converts each text character into its numeric code point and expresses that number in a chosen base - base 2 (binary), base 16 (hexadecimal), or base 8 (octal). For example, the letter H has ASCII code 72, which encodes as 01001000 in binary, 48 in hexadecimal, and 110 in octal. This binary-to-ASCII converter handles both directions - encode text to any base, or paste an encoded string to decode it back to readable characters.

Computers store and transmit all data - text, images, audio - as sequences of 0s and 1s. Each character is represented by a numeric code (its code point), and binary encoding expresses that number in base-2. For example, the letter A has ASCII code 65, which in binary is 01000001, in hexadecimal is 41, and in octal is 101.

CS coursework: Binary and hex representations appear in virtually every introductory computer science course - from integer overflow to bitwise operations to memory addressing.
Protocol debugging: Network packets, file headers, and serial bus frames are often documented in hexadecimal. Being able to convert hex back to ASCII characters helps decode protocol payloads at a glance.
Three bases in one tool: Binary, hex, and octal all represent the same underlying byte values - switching between them lets you cross-check conversions without juggling multiple tools.
100% private: All conversion runs in your browser. Your text is never sent to any server.
Completely free: No account, no rate limits, no paywalls.

How to Convert Binary to Text - 3 Steps

Choose direction and mode - select "Encoded → Text" to decode binary/hex/octal back to readable characters, or "Text → Encoded" to go the other way.
Paste your input - for encoding, type or paste plain text; for decoding, paste the binary, hex, or octal string.
Click Convert, then Copy - the result appears instantly. Use the Copy button to grab it.

Understanding the Modes

All three modes encode the same thing - the numeric value of each character - just in different number bases:

Mode	Base	Digits	Example ("A")	Common Use
Binary	2	0–1	01000001	CS theory, bitwise ops, data representation
Hexadecimal	16	0–9, A–F	41	Memory addresses, color codes, protocol headers
Octal	8	0–7	101	Unix file permissions, legacy systems

Binary (Base 2)

Binary uses only the digits 0 and 1. Each ASCII character maps to an 8-bit group (one byte), so binary output is the longest of the three bases but the most granular. It is the format taught in CS fundamentals courses and used to explain integer overflow, bitwise AND/OR/XOR operations, and two's complement arithmetic. Example: "Hi" → 01001000 01101001.

Hexadecimal (Base 16)

Hex uses digits 0–9 and letters A–F. One byte maps to exactly two hex characters, making it 4× more compact than binary while remaining unambiguous. Hex is the default representation in debuggers, memory dump tools, network packet analyzers, and CSS color codes. This hex-to-text decoder accepts both lowercase and uppercase input. Example: "Hi" → 48 69.

Octal (Base 8)

Octal uses digits 0–7. Three bits map to one octal digit, so each byte spans one to three octal digits. Although largely replaced by hex in modern tooling, octal remains the base used by Unix chmod permission notation (chmod 755) and in C/C++ numeric literals prefixed with 0. Example: "Hi" → 110 151.

Practical Examples

Below are three ready-to-verify conversions you can paste directly into the tool to confirm the output.

Text to Binary: "Hello"

Select Text → Encoded, mode Binary, separator Space, then type Hello. Expected output:

01001000 01100101 01101100 01101100 01101111

H=72→01001000, e=101→01100101, l=108→01101100, l=108→01101100, o=111→01101111

Hex to Text: Decoding a Protocol Payload

Switch to Encoded → Text, mode Hex, then paste:

48 65 6C 6C 6F 20 57 6F 72 6C 64

Result: Hello World - the kind of payload you might extract from a Wireshark capture or firmware dump.

Binary to ASCII Decoder: No-Separator Mode

Paste the following unseparated binary string (common in CTF challenges and textbook exercises) with Encoded → Text and Binary selected:

0100111101001011

The decoder auto-chunks into 8-bit groups: 01001111 = 79 = O, 01001011 = 75 = K → result: OK.

Key Features of This Binary Converter

Three number bases in one tool: Switch between Binary (base 2), Hexadecimal (base 16), and Octal (base 8) without opening a different page - ideal for cross-checking number base conversions.
Auto-detect separator on decode: Paste space-separated, comma-separated, or contiguous strings - the decoder identifies the right split automatically, including no-separator binary (8-bit chunks) and hex (2-digit chunks).
Flexible output separators: When encoding, choose Space (most readable), Comma (CSV-friendly), or None (compact single-string output for further programmatic processing).
Unicode BMP support: Converts characters in the Basic Multilingual Plane (code points U+0000–U+FFFF), covering Latin, Cyrillic, Greek, CJK, Arabic, and more.
100% browser-based and free: No file uploads, no server calls, no rate limits. Your text never leaves your device.

Frequently Asked Questions

How do I convert binary to text?

Each 8-bit group of 0s and 1s represents one byte. The tool converts each group to its decimal value using base-2 arithmetic, then maps that value to the corresponding ASCII or Unicode character via String.fromCharCode(). For example, 01001000 = 72 = H.

What separator should I use when decoding?

The decoder auto-detects spacing - it splits on spaces, commas, or newlines. If your binary string has no separator (e.g. 0100100001100101), it will chunk the string into 8-character groups automatically. For hex, it chunks into 2-character groups when no separator is present.

Does this tool support Unicode / non-ASCII characters?

Yes, within the Basic Multilingual Plane (code points 0–65535). The tool uses JavaScript's native charCodeAt and String.fromCharCode, which handle BMP characters. For full emoji or supplementary characters, results may vary because those use surrogate pairs.

What is hexadecimal used for?

Hex is a compact way to write binary values. Every byte (8 bits) maps to exactly two hex digits, making it far more readable than raw binary. You'll encounter hex in CSS color codes (#FF5733), memory addresses, file magic bytes, and network protocol documentation.

Where is octal still used?

Octal is most commonly seen in Unix/Linux file permission notation - chmod 755 is an octal value where each digit encodes three permission bits (read, write, execute). It also appears in some older programming languages like C, where numeric literals starting with 0 are treated as octal.

What is the difference between binary, hex, and octal?

All three represent the same underlying byte values - they are simply different number bases. Binary (base 2) uses 0–1 and is the most verbose (8 digits per byte). Hex (base 16) uses 0–9 and A–F and is 4× more compact (2 digits per byte). Octal (base 8) uses 0–7 and falls in between. Choose hex when readability and compactness matter, binary when you need to see individual bits, and octal for Unix permission contexts.

Can I use this as a binary-to-ASCII converter?

Yes. Select Encoded → Text and Binary mode, then paste your binary string. The tool converts each 8-bit group to its decimal value and maps it to the corresponding ASCII (or Unicode BMP) character via String.fromCharCode(). It handles space-separated, comma-separated, and contiguous (no-separator) binary input.

Is my text stored or sent anywhere?

No. All conversions happen entirely in your browser using JavaScript. Nothing you type or paste is ever transmitted to a server, stored in a database, or shared with any third party.

Related Text Tools

HTML Entities Encoder/Decoder - escape and unescape HTML special characters for safe rendering in browsers and emails.
Case Converter - transform text between UPPER CASE, lower case, Title Case, and sentence case.
Text Reverser - reverse a string character by character or word by word.
Sort Lines - sort any list alphabetically, numerically, or randomly with one click.
Remove Duplicate Lines - deduplicate a list and keep only unique lines.
Browse the full Text Tools suite for more free browser-based text utilities.