TikTok Character Limit: Caption, Bio and Comment Limits (2026)
TikTok has three different character limits people mix up: 4,000 characters for a video caption, 80 for the bio, and 150 for a comment. They are wildly different sizes, which is why searching for the TikTok character limit and getting one number when you needed another is so common. This guide gives you every field for 2026 and, more importantly, how much of each one people actually see.
Caption: 4,000 characters
TikTok raised the caption limit to 4,000 characters, a huge jump from the old 300. The change was deliberate: longer captions give TikTok's search more text to index, so a described, keyword-rich caption can help your video get found. But the count includes spaces, hashtags, mentions and emoji, and emoji frequently cost two characters rather than one. Hashtags eat into the same 4,000, so a wall of thirty tags is spending caption budget you could use on words that help discovery.
The catch is display. TikTok's interface is full-screen video, and only about the first 100 characters show before the caption is truncated behind a tap. Most viewers never expand it. So while you have 4,000 characters, the first sentence is doing almost all the work, exactly like an Instagram caption. Front-load the hook and the keyword; put the long description after, where it still helps search even if few humans read it.
- Caption: 4,000 characters
- Visible before tap: ~100 characters
- Counts toward it: text, spaces, hashtags, mentions, emoji
- Emoji often cost 2 characters
- Old limit was 300 - many guides are outdated
Comment: 150 characters
A TikTok comment is capped at 150 characters. This is the tightest of the main limits and the one people hit most often, because 150 characters is barely two short sentences. It counts spaces and emoji like everything else, and emoji again tend to cost two, so a comment decorated with a few can lose real room. If your comment gets cut off, this is almost always why: not that it was far too long, but that spaces and emoji were not counted.
For creators replying to comments, the 150-character ceiling is a design constraint worth respecting. Short, direct replies read better in the comment stream anyway, and if you genuinely need more room, a video reply to a comment gives you the full 4,000-character caption instead.
Bio: 80 characters
The TikTok bio allows 80 characters. Like every bio field across social platforms, it is short on purpose, roughly a dozen words, so it forces you to pick one job for the line: say what you do, point people somewhere, or land a single sharp line that gives a sense of you. Trying to do all three in 80 characters produces something cramped. Emoji and line breaks count, and on an 80-character budget a couple of decorative emoji is a meaningful share of the whole thing.
- Bio: 80 characters
- Username: 24 characters
- Comment: 150 characters
- Display name: 30 characters
- All count spaces and emoji
Why the counts surprise people
Across all three fields the pattern is identical: spaces are included, emoji usually count as two characters, and line breaks count too. People estimate by eye, land at what feels safe, and lose the last few characters to gaps they did not count. On the bio and comment, where the whole budget is tiny, that is the difference between fitting and being cut.
A quick method for each field
For a caption, write the full description you want, then check that your hook and main keyword both sit inside the first 100 characters, because that is all most viewers see. For a comment, if you are over 150, cut filler words first, they carry the least meaning per character. For a bio, drop any adjective that could describe anyone and keep the one concrete detail that could not. In every case, counting before you post turns editing into a precise task instead of trial and error inside the app.