Bubble text on Instagram and TikTok is a copy-paste job, not an app feature. You generate the circled letters with the bubble text generator, copy them, and paste them into the bio, caption, or comment field.
Both apps render standard Unicode, so the circled bubble alphabet works in the same places on each. This guide has the per-app steps and the one style choice that matters.
Instagram: bio, caption, comments
1. Generate your bubble text and copy it.
2. For a bio: profile → Edit profile → Bio → paste → Done. For a caption: paste when creating the post. For a comment: paste into the comment box.
3. Instagram bios cap at 150 characters and bubble letters count as one character each, so they don't buy extra room.
Bubble text is blocked in the @username field.
TikTok: bio and captions
1. Copy your bubble text.
2. For a bio: Edit profile → Bio → paste (TikTok bios cap at 80 characters). For a caption: paste when posting.
3. TikTok's Nickname field accepts bubble letters; the unique @username does not.
Circled, not filled
Use the circled style (ⓐ) rather than the filled style (🅐) on both apps. Circled covers upper case, lower case, and digits and renders consistently on iOS and Android. Filled is capitals-only and shows as coloured tiles or plain letters on some devices — details in bubble letters to copy and paste.
Keeping it readable
Every bubble letter is wrapped in a circle, so a full bio in bubble text is dense and slow to read. Use it for your name or one line, and keep the rest of the bio plain — the Instagram bio guide covers that layout.