Outline text generator

Outline text uses double-struck characters, which most people meet under the name blackboard bold. The look is a letter whose main stroke has been doubled, leaving a thin hollow down the middle, so the glyph reads as outlined without actually being a hollow shell. Unicode calls them double-struck, and the full alphabet lives in the Mathematical Alphanumeric Symbols block from U+1D538.

The name blackboard bold explains the design. Mathematicians writing on a chalkboard could not make a letter look bold by inking it heavier, because chalk does not work that way, so they took to drawing part of the stroke twice. It became standard notation for the important number sets, and it moved from the board into print. That is why the double-struck N, Z, Q, R and C are instantly recognisable to anyone who has done any maths: they mean the natural numbers, the integers, the rationals, the reals and the complex numbers.

That history creates the same gap problem as the other mathematical alphabets, and slightly worse. Seven double-struck capitals were encoded earlier in Letterlike Symbols because they were already in use as those number set symbols: C, H, N, P, Q, R and Z. The main block leaves their slots reserved and empty. A generator that offsets code points arithmetically loses seven of the twenty-six capitals, and since they include C, N, P and R, most English words with a capital hit one. FontVibe maps each to its real code point in the other block.

Double-struck digits do exist, from U+1D7D8, which makes this one of only a few styles here that covers 0 to 9. Lowercase is complete too. What you will not find is punctuation: there is no outlined comma or full stop, so those stay plain, and a long outlined sentence ends up with normal-weight punctuation dotted through it. Short phrases avoid the problem.

Visually, outline letters are the highest-contrast option on this site, which cuts both ways. They stand out hard against a plain background and they are the easiest style to read at a glance from a distance, which makes them good for a single-line heading. At small sizes on a low-density screen the hollow can fill in, or the two strokes can merge into something that just looks slightly wrong, so they are a poor choice for long text or fine print. If you want them to breathe, the spaced variant helps, since the hollow reads more clearly with air around each glyph.

Common questions

Why are outline and double-struck the same thing?

They are two names for one alphabet. Unicode calls the characters double-struck, mathematicians call the style blackboard bold, and most people online describe the result as outline text because that is what it looks like. All three refer to the same set of code points.

Why do some capitals look like maths symbols?

Because they are. Seven double-struck capitals were encoded as the standard symbols for number sets before the full alphabet existed, so your C, H, N, P, Q, R and Z come from that older block. In most fonts they match the rest of the alphabet closely.

Can I get outlined numbers and punctuation?

Numbers yes, a full double-struck 0 to 9 exists. Punctuation no, so commas, full stops and question marks stay in your normal font weight. It is barely noticeable in short text and obvious in a paragraph.

Is outline text a good choice for a bio?

For one line, yes, it is one of the most eye-catching options. For a whole bio, no. The hollow strokes get muddy at small sizes and the unstyled punctuation starts to show. Use it for a heading and keep the rest plain or lightly styled.

See also

• Bubble letters generator
• Bold text generator
• Gothic and Old English text generator