Number Utilities
Text / Binary Converter
See the UTF-8 bytes behind ordinary text as groups of eight binary digits, or decode valid byte groups back into text.
✓ Every tool runs in your browser. We do not upload your input or output.
Keyboard shortcuts
Ctrl/⌘ + Enter: process
Ctrl/⌘ + Shift + F: full screen
Esc: exit full screen
Ctrl/⌘ + F in editor: search
How to use
- Choose Text to binary and enter a word or sentence.
- Run the conversion and inspect each eight-bit byte group.
- Switch to Binary to text to decode space-separated byte groups.
- Copy or download the result for a protocol example or debugging note.
Examples
Inspect a Unicode greeting
The waving hand occupies more than one byte, so it creates several groups.
Hi 👋
01001000 01101001 00100000 followed by four UTF-8 byte groups
Read bytes instead of glyphs
A string can look short while taking more bytes than expected. ASCII letters usually occupy one UTF-8 byte each, while many symbols and emoji use several bytes. This converter makes that distinction visible. Each output group has eight digits, with spaces between groups. When decoding, the tool validates the group length and asks the browser’s strict UTF-8 decoder to reject malformed sequences.
Use it while explaining wire formats, inspecting a sample payload, or checking whether text was encoded before a binary protocol step. It is not a general bit-field editor: the binary input is treated as text bytes, not as one large unsigned integer. For numerical base conversion use the Number Base Converter. Processing runs locally, and the editor keeps the full result available for copying even if the preview is shortened for a large input.
A round trip is a useful sanity check: encode a phrase, copy the output, switch direction, and decode it. If the returned phrase differs, inspect spacing and whether the original included a newline. Binary groups represent bytes, so character boundaries may span groups.
Frequently asked questions
Is each character one byte?
No. UTF-8 uses one to four bytes for a Unicode code point.
Can I enter 101 instead of 00000101?
No. Decoding expects complete eight-bit groups separated by whitespace.
Are these machine integers?
They are the bytes of UTF-8 encoded text, displayed in base two.
Why did decoding fail?
The groups may not form valid UTF-8 text or may include characters other than zero and one.