Write the description here, select the words, click B, copy and paste into YouTube Studio. YouTube has no bold button, so the bold comes from Unicode letters.
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Free YouTube text formatter
YouTube descriptions take plain text only, so this tool writes bold and italic in Unicode letters for descriptions, titles and comments.
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How YouTube text formatting works
Descriptions count bytes
YouTube caps a description at 5,000 bytes, and a styled letter takes 4. A fully styled description fits about 1,250 letters; plain English fits 5,000.
Bold the chapter headings
Styled section titles make a long description easy to scan. Keep timestamps and links in plain characters so YouTube turns them into links.
Titles: use it sparingly
Titles accept any character except < and >, styled letters included, but they hurt search: people type plain words. Keep the keywords plain.
Example: “Big news” = 𝗕𝗶𝗴 𝗻𝗲𝘄𝘀: 8 characters here, 29 of YouTube's 5,000 bytes
Checked on October 11, 2026, against YouTube's rules and limits.
Reference
Where styled text works on YouTube, and where it does not
Every place you might paste styled letters on YouTube, and what happens there.
| On YouTube | Styled text | Good to know |
|---|---|---|
| Descriptions | Works | Each styled letter takes 4 bytes of 5,000 |
| Titles | Works | Keep the search words plain |
| Comments | Works | Keep it to a word or two |
| Timestamps and links | Keep plain | Styled, they stop being clickable |
| Channel name | Avoid | Viewers search for it in plain letters |
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Questions
YouTube text formatting, answered
Yes. YouTube caps descriptions at 5,000 bytes and a styled letter takes 4, so bold text fills the limit four times faster than plain English.
YouTube accepts it, but searchers type plain words, so a styled keyword is harder to find. Style one word at most, never the keyword.
No. Write timestamps (0:00) and links in plain characters so YouTube turns them into chapters and links.
It can be. Some screen readers skip styled letters, others spell each one out. Style a few words, never a whole post, and never your name or a link.
Yes. No signup, no limit, and your text never leaves your browser.
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