Bio character limits differ a lot by platform. As of 2026 the common figures are: Instagram bio 150 characters, TikTok bio 80 (the tightest), X / Twitter bio 160 (the display name is a separate 50), the LinkedIn headline 220 characters with a much longer 2,600-character About section, and a YouTube channel description up to 1,000. Several platforms only SHOW the first ~70–100 characters before a “…more” cut-off — LinkedIn about 70, YouTube about 100–150 — so put your strongest keywords first. This tool counts Unicode code points and warns you as you approach and pass each limit; treat the numbers as current best estimates because platforms change them without notice.

There is no AI or machine-learning model anywhere in this tool, and no network request. Each bio is built by slotting your name, niche, keywords, tone and CTA into curated local templates (six structural styles) and small per-tone wordbanks of opening leads, closing lines and emoji, then trimming optional pieces so it fits the platform limit. Because it is deterministic, the same inputs plus the same seed always produce the same variants, and pressing shuffle simply advances the seed for a fresh but repeatable set. The honest trade-off is that templated copy is a strong STARTING POINT, not finished writing — personalise it with a specific outcome, a number or a location before you publish.

The proven formula is three beats: say who you are (specific and differentiated), who you serve or what you cover, and what to do next. Specificity beats personality — “I help first-time buyers find homes in Austin” outperforms “dreamer | coffee | dog mom” — and value beats a bare job title. Front-load your main keyword in the first line because search and previews cut off early, and finish with an action-verb CTA like “book a call” or “shop the drop”. This tool bakes those patterns into its template styles (the who·serve·CTA formula, value-first and keyword-forward), but the final edit is yours: tighten to one crisp idea, add a concrete detail, and revisit the bio every quarter.

Privacy is structural. Everything — parsing your inputs, filling the templates, counting characters and trimming to the limit — runs on your device in JavaScript, with no server, upload, database, logging or CDN anywhere in the processing path. Bios you favourite are held only in this browser tab’s memory and vanish when you close or reset it; nothing is persisted or transmitted. The tool works offline once cached, and the only optional network use anywhere on the site is consent-gated advertising, which never sees what you type.