How to bold a Facebook post
1. Type the words you want bold in the box above.
2. Copy the bold result.
3. In Facebook, start your post, paste the bold words where you want them, and type the rest normally.
You can mix bold and plain text in one post. A common pattern is a bold first line, so the hook stands out before the "See more" cut, followed by plain text that reads and searches normally.
Post opening
𝐖𝐞'𝐫𝐞 𝐡𝐢𝐫𝐢𝐧𝐠. Two weekend shifts, apply by Friday.
Why Facebook has no bold button
Facebook shows posts, comments and profile fields in your device's system font and gives you no formatting controls. What you paste from this tool is not formatting: each letter is replaced by a separate Unicode character from the mathematical bold alphabet, which looks bold on its own.
That is why it survives copy and paste, and why it works on Pages, groups and profiles alike. It is also why it has limits: it covers letters and digits, not punctuation, and it is not ordinary text for search or screen readers.
Where it works on Facebook
Posts, comments, Page posts, Messenger messages and your 101-character intro all accept bold Unicode. Your profile name and username do not.
Use it for emphasis, not decoration. A bold headline, a bold price or a bold date helps a reader scan a long post. A post written entirely in bold is harder to read, and people using screen readers may hear nothing useful at all.