Rotate text 180 degrees through a bijective character table, with a round-trip check that proves nothing was lost in the transformation. BIJECTIVE TABLEROUND-TRIP CHECKCLIENT-SIDE
How it works: a lookup table of characters whose glyphs survive a 180° rotation is applied character by character, then the whole string is reversed. The table is injective — no two characters share a rotated form — and the tool reverses its own mapping on the way back, so Round trip returns your original text. The six glyphs f, i, j, r, w and y have no distinct upper-case form in Unicode, so case is the one thing a round trip cannot restore; the panel says so instead of hiding it.
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