Convert text to binary (01010100...) and binary back to readable text — instantly, in your browser.
Input Text
Binary Output
Binary will appear here…
Characters: 0
Bytes: 0
Binary bits: 0
Binary Input
Text Output
Text will appear here…
Binary groups: 0
Characters decoded: 0
What Is a Binary ↔ Text Converter?
Computers store and process all data as binary — sequences of 0s and 1s. Each character in the ASCII/Unicode standard has a numeric code, and that code can be expressed as an 8-bit binary number. For example, the capital letter H has the ASCII value 72, which in 8-bit binary is 01001000.
This tool converts plain text into its binary representation and decodes any valid 8-bit binary string back into readable text — all inside your browser with zero data sent to a server. Text is encoded as UTF-8, so ASCII stays one byte per character while Chinese, Japanese, Korean and emoji use several bytes — every group is still exactly 8 bits, and encoding then decoding always returns the original text.
How to Use This Tool
Text → Binary: Select the "Text → Binary" tab, type or paste your text, choose a separator style (space, dash, or none), and the binary output is generated instantly. Click "Copy Binary" to copy the result.
Binary → Text: Select the "Binary → Text" tab, paste space-separated 8-bit binary groups (e.g. 01001000 01101001), and the decoded text appears immediately. The tool validates each group and highlights any errors.
Use "Load Sample" to see an example if you're not sure what input to provide.
Common Use Cases
• Education: Understand how computers represent characters internally — great for CS students learning about ASCII, encoding, and data representation.
• Puzzles & CTFs: Binary-encoded messages are a popular format in Capture The Flag competitions and escape room puzzles.
• Debugging: Quickly inspect the raw binary encoding of special characters, whitespace, or control codes.
• Fun & Creativity: Encode secret messages in binary to share with friends who know how to decode them.
Frequently Asked Questions
What does 8-bit binary mean? ＋
Each byte is represented by exactly 8 binary digits (bits). For example, "A" = 01000001. Eight bits allow values from 0 to 255, which covers the whole ASCII set. Characters outside ASCII are not given longer groups — UTF-8 gives them several bytes instead, and every byte is still 8 bits.
Why does the binary → text decoder require 8-bit groups? ＋
UTF-8 is a byte-oriented encoding: text is a sequence of bytes and each byte is 8 bits. If a group has fewer or more than 8 bits it is not a byte, so the validator flags it. If the groups are valid bytes but do not form a legal UTF-8 sequence (for example a CJK character missing one of its three bytes) the decoder says so instead of returning mojibake. One compatibility exception: if every group is 16 bits, that is this tool's pre-2026-07-26 output format, and it is decoded using the old rules with a note on screen.
Does this tool support Unicode / emoji? ＋
Yes, fully — and the round trip works. Text is encoded as UTF-8: ASCII characters take one byte, most CJK characters take three, and emoji take four. Every group is exactly 8 bits, so you can copy the binary, paste it into the decoder and get your original text back. Honest note about the old behaviour: before 2026-07-26 the tool used JavaScript char codes (UTF-16 code units) and emitted 15- or 16-bit groups for anything above code point 255, while the decoder only accepted 8-bit groups. The tool literally could not decode its own output for non-Latin text, and emoji were split into meaningless surrogate halves. ASCII output is unchanged.
What separators are supported for binary input? ＋
The binary-to-text decoder accepts space-separated 8-bit groups as input (e.g. "01001000 01101001"). When encoding text to binary, you can choose a space, dash (–), or no separator at all for the output format.
Is my data sent to any server? ＋
No. All conversion happens entirely in your browser using JavaScript. No text or binary data is sent to any server, making this tool completely private and safe to use with sensitive content.
How do I convert binary without spaces? ＋
For binary → text decoding, paste binary without spaces and the tool will automatically split the string into 8-bit chunks from left to right. As long as the total length is a multiple of 8, it will decode correctly.
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