How flipped text works
There is no “upside-down” switch in Unicode. Instead, each letter is replaced with a look-alike character that resembles it rotated 180°: a → ɐ, e → ǝ, h → ɥ, t → ʇ, y → ʎ, capital A → ∀, E → Ǝ, T → ⊥, digits and punctuation such as ! → ¡ and ? → ¿. Then the text is reversed, so it reads correctly when you turn your screen around. Choose Upside down, not reversed to keep the original order.
Mirror reverses the text and swaps characters that have mirror twins (b ↔ d, p ↔ q, ( ↔ )), giving a mirror-writing effect.
Limitations
Not every letter has a convincing rotated twin (upside-down capital letters in particular borrow from different scripts, so results vary by font). Accents are removed before flipping. As with all Unicode tricks, screen readers can’t read the result naturally, so keep it for fun.
Worked example
Here is what the Upside Down Text returns for its built-in example. Settings used: Effect: Upside down. Click Try an example in the tool above to load it, then change it as you like.
Hello, world! 123ƐᄅƖ ¡plɹoʍ 'ollǝHQuestions
How do I type upside down?
Type normally in the box; the upside-down version appears instantly to copy and paste.
Can I flip it back?
Paste flipped text and choose Upside down again; most characters map back to their originals.
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