ASCII to Binary Converter
Convert ASCII text to binary instantly (e.g., 'A' = 01000001). Free online ASCII to binary converter for developers.
100% Client-Side Processing
Your data is converted entirely in your browser. No data is sent to any server.
Table of Contents
What is ASCII ↔ Binary conversion?
ASCII ↔ Binary conversion converts text into binary byte values (and back). This is useful for inspecting bit-level representations and debugging low-level data.
This tool treats text as UTF-8 bytes for numeric formats (decimal/hex/binary/octal). Non-ASCII characters (like emoji) will convert to multiple bytes.
How it Works
- Paste input (text or binary bytes).
- Convert instantly as you type.
- Copy the result.
Binary decoding supports spaced bytes and compact binary grouped into 8-bit bytes when enabled.
Common Use Cases
When to use ASCII to Binary
- Inspecting raw bytes as bit patterns
- Debugging protocols and file formats that specify bits/flags
- Learning how characters map to bytes
- Working with binary dumps in logs
When to use Binary to ASCII
- Decoding binary payloads back to readable text
- Converting 8-bit byte streams into strings
- Checking whether a binary sequence matches expected text
- Rebuilding readable messages from binary logs
Examples
Single character
- Input:
A - Output:
01000001
Spaced bytes
- Input:
Hi - Output:
01001000 01101001
Special characters (UTF-8 bytes)
- Input:
👋 - Output:
11110000 10011111 10010001 10001011
UTF-8 encodes emoji using multiple bytes.
Want to look up a character code first? Check the ASCII Table for a complete reference.
Conversion Tips
Byte grouping matters
- Use 8-bit groups: 01000001
- Leading zeros are significant for readability and correct grouping
Compact vs. spaced input
If you paste a compact binary string, enable the “assume compact binary is 8‑bit bytes” option so it will be grouped correctly.
Frequently Asked Questions
Spaces make it easier to read and debug binary data as byte groups. You can remove spaces if you need a compact form.
Yes. Unicode characters are converted using UTF-8 bytes, so they can become multiple 8-bit values.
Common ASCII values
- Space: 20 (hex) / 32 (decimal)
- 0-9: 30-39 (hex) / 48-57 (decimal)
- A-Z: 41-5A (hex) / 65-90 (decimal)
- a-z: 61-7A (hex) / 97-122 (decimal)
See the full ASCII Table for all character codes. ASCII Table.