Style Text · browser-local
Bold Text Generator
Create copyable bold-looking characters without rich-text formatting. The result uses the Mathematical Alphanumeric Symbols block and reports how much of your input was actually converted.
- Index state
- eligible
- Reviewed
- 2026-08-24
- Input limit
- 5,000 graphemes
Bold Text Generator
𝐁𝐨𝐥𝐝 𝐭𝐞𝐱𝐭 𝟐𝟎𝟐𝟔
Good fit
Use this tool when
- You need emphasis in a plain-text field.
- Your source mainly contains English letters and digits.
- You want to inspect the exact characters after conversion.
Keep the original
Avoid it when
- Bold formatting is already available in the editor.
- The text must be maximally accessible or searchable.
- You need bold output for a non-Latin alphabet.
Reviewed truth vectors
Examples that expose the edge cases
Bold 42𝐁𝐨𝐥𝐝 𝟒𝟐Letters and decimal digits are mapped.
Café𝐂𝐚𝐟éThe accented letter stays unchanged.
Sale → 20%𝐒𝐚𝐥𝐞 → 𝟐𝟎%Punctuation is preserved.
Transparent implementation
How it works
- 01
Match ASCII A–Z, a–z, and 0–9.
- 02
Replace matches with their Mathematical Bold counterparts.
- 03
Count other letters and digits as unsupported for coverage reporting.
Known limitations
What the result cannot promise
Accented and non-Latin letters remain unchanged.
Some screen readers announce mathematical characters differently.
A destination may normalize, filter, or display tofu boxes.
Questions before copying
Frequently asked questions
Can I make only one word bold?
Yes. Enter or select just that word, copy the result, and place it back into your sentence.
Why are these characters wider?
They are separate mathematical code points and the destination font controls their metrics.
Can I convert the result back?
GlyphSift can identify the characters, but round-trip conversion should not be assumed for arbitrary styled text.
Experience, expertise & trust
How we verify this tool
Automated evidence
- Tool-contract & coverage suite30 deterministic cases
tests/tools-30.test.mjs mirrors the ToolRunner dispatch and asserts every registered engineId returns the contracted output shape, plus a coverage guard so no tool silently drops characters.
Run in: node --test after a production build (vinext build) - Rendered-HTML suite12 deterministic cases
tests/rendered-html.test.mjs renders the deployed server bundle and asserts the Unicode-version manifest and each wave's tool markup are present in the server-rendered HTML.
Run in: node --test against the built dist/server bundle - Transform & cleanup suite21 deterministic cases
tests/transform-cleanup.test.mjs exercises each deterministic cleanup and transform action against whitespace, duplicate, ordering, casing, and HTML-to-text edge cases.
Run in: node --test, no network, no randomness
Standards this tool follows
- The Unicode Standard, Version 17.0
Mathematical Alphanumeric Symbols and Enclosed Alphanumerics blocks used for presentation styles.
- UAX #44: Unicode Character Database
Character properties that determine which source characters have a style mapping.