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Text to Unicode Guide

About this tool

Show the Unicode code points behind a piece of text, as U+XXXX escapes and as decimal values, and turn those escapes back into text. It is the quickest way to find out what an invisible or look-alike character actually is.

Questions

What is the difference between a code point and a UTF-8 byte?
A code point is the abstract character number. UTF-8 is one particular way of writing that number as bytes, so the same code point can occupy a different number of bytes in a different encoding.
Why does text I copied have an invisible character in it?
Usually a zero-width space or a non-breaking space picked up from a web page or a word processor. Listing the code points is what makes it visible.