Font Glyph-Support Checker
Checks whether your current browser/OS combination has an actual glyph for a character, using a canvas width comparison.
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About this tool
Draws each character on a hidden canvas and compares its pixels with the "no glyph available" box your device draws for code points that can never have a glyph — if they match, your system is very likely falling back to a missing-character box rather than a real glyph. Paste several characters at once to check them all; invisible characters such as zero-width joiners and combining accents are labelled as such rather than counted as missing. This is a heuristic, not a guarantee, and reflects your device only, not every visitor's.