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Free Text to Binary Converter

Convert text to 8-bit binary and decode binary back to text, with optional decimal and hex output. Runs entirely in your browser, so nothing is uploaded.

Quick answer

A text-to-binary converter turns each character into its numeric byte value and writes that value in base 2 as an 8-bit group, separated by spaces. For example, "Hi" becomes "01001000 01101001" because the letter H is byte 72 and i is byte 105. Decoding reverses this: each 8-bit group is read as a number and mapped back to a character. It is a reversible encoding, not encryption.

Formula & method

Each character is first turned into its UTF-8 bytes. Every byte (0–255) is then written in the chosen base — binary padded to 8 bits, decimal, or hex padded to 2 digits — and the groups are joined with spaces. ASCII letters, digits, and punctuation each become a single 8-bit group; characters outside ASIC, such as accented letters or emoji, become two to four bytes. Decoding splits the input on whitespace, parses each group as a number, validates that it fits in one byte, and rebuilds the original text from those bytes using UTF-8. All of this happens locally in your browser.

Examples

Example 1: Encode "Hi" to binary
Input
Hi
Result
01001000 01101001
Why
H is byte 72 (01001000) and i is byte 105 (01101001), each padded to 8 bits.
Example 2: Encode "Cat" to binary
Input
Cat
Result
01000011 01100001 01110100
Why
C=67, a=97, t=116 — three characters give three 8-bit groups.
Example 3: Encode "Hi" to hex
Input
Hi
Result
48 69
Why
Switching the output base to hex shows the same bytes 72 and 105 as 48 and 69.
Example 4: Decode binary back to text
Input
01000010 01111001 01100101
Result
Bye
Why
The three groups are bytes 66, 121, 101, which map to B, y, e.

When to use this tool

  • Learning or teaching how computers store text as bytes and bits.
  • Preparing a binary string for a homework problem, puzzle, CTF challenge, or coding exercise.
  • Inspecting the exact byte values behind a piece of text, including the decimal or hex view.
  • Decoding a space-separated binary, decimal, or hex string someone sent you back into readable text.

Common mistakes

  • Leaving out the spaces between groups. The decoder needs whitespace to know where one 8-bit byte ends and the next begins.
  • Using groups that aren't 8 bits long. A 7-bit or 9-bit group is ambiguous, so always pad binary to 8 digits per byte.
  • Confusing binary encoding with encryption. Anyone can decode binary instantly, so never use it to hide passwords or secrets.
  • Pasting a value above 255 in a single group. One byte only holds 0–255; characters beyond ASCII span several bytes.

Frequently asked questions

How is text converted to binary?

Each character is turned into its UTF-8 byte value, and that number is written in base 2 padded to 8 bits. For example, the letter A is byte 65, which is 01000001 in binary.

Why is each group 8 bits long?

One byte is 8 bits and can hold values 0 through 255, which covers every ASCII character. Padding to 8 bits keeps the groups a fixed, unambiguous width so they decode reliably.

Can it convert binary back to text?

Yes. Switch to the Binary → Text mode, paste space-separated 8-bit groups, and each group is read as a byte and mapped back to its character using UTF-8.

Does it support emoji and accented characters?

Yes. Those characters are encoded as multiple UTF-8 bytes, so a single emoji or accented letter may produce two to four 8-bit groups that still round-trip exactly.

What's the difference between the binary, decimal, and hex output?

They are the same byte values shown in different number bases. The letter H is 01001000 in binary, 72 in decimal, and 48 in hex — identical data, different notation.

Is binary the same as encryption?

No. Binary is a reversible encoding that anyone can decode instantly. It provides no secrecy, so it should never be used to protect passwords or sensitive data.

Is my text sent to a server?

No. The conversion runs entirely in your browser using JavaScript, so the text you enter never leaves your device.

Sources & references

External references open in a new tab. We are independent and not affiliated with these organizations.

  • ✓ Free to use
  • ✓ No sign-up required
  • ✓ Runs entirely in your browser — nothing is uploaded.
  • ✓ Formula and method shown above
Last updated: How we calculateReport a correctionDisclaimer

Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.

Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.

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