Instagram fonts, as a search, means letters that look designed when you paste them into a bio or a caption. Instagram itself uses one interface font. It will not switch to a typeface this site invented, because this site does not invent one. The fancy text generator copies Unicode characters that many phones already know how to draw. Paste them into the caption box. If they show up in the preview, the post will show them too. If the preview turns them into empty boxes, pick another style.
Bios are short. The 280-character limit on this page is longer than a bio and shorter than a blog post, which matches the job. Display names are searched as text. A name made only of script symbols is harder for a friend to find and may be read aloud as a string of symbol names by a screen reader. Use one styled word, not a whole legal name. Hashtags work more reliably in ordinary letters. A fancy hashtag often does not match the tag other people follow.
The font generator page is the same list under the other common name. Copy uses your clipboard. Nothing is uploaded and there is no watermark added to the text. Strikethrough and underline depend on combining marks, which some Android keyboards display unevenly. Fullwidth and bold are the safer pair when you only have one chance to paste before a story expires.
This will not schedule the post, edit a photo, or generate a caption from a prompt. It restyles the words you already wrote. A QR code for a link belongs on the QR code generator, using the real URL. Jawi text belongs on the Jawi converter, not in a Latin script style that would mangle it.