Every platform draws its line in a different place, and hitting it mid-word is the fastest way to look sloppy. Here are the limits that actually matter in 2026 — and the reason the best posts stop well short of them.
Short answer: X posts cap at 280 characters (free), Instagram captions at 2,200, and your SEO meta description should land near 155. Paste your draft into the Character Counter to see the count update as you type, before a platform quietly truncates it.
The platform limits
| Platform | Field | Limit |
|---|---|---|
| X (Twitter) | Post | 280 (free) / 25,000 (Premium) |
| Caption | 2,200 | |
| Bio | 150 | |
| TikTok | Caption | 4,000 |
| Post | 3,000 | |
| Headline | 220 | |
| Post | 63,206 | |
| YouTube | Title | 100 |
| YouTube | Description | 5,000 |
| Threads / Bluesky | Post | 500 / 300 |
| Pin description | 500 |
Limits change — platforms raise caption caps and add paid tiers regularly — so treat any specific number as “check before a big campaign.” The shape of the advice, though, barely moves: the caption fields are generous, the bio and headline fields are cruelly short, and titles are where you fight hardest for words.
The SEO limits nobody enforces (but everyone should)
Search engines don’t reject a long title — they just cut it off. Two lengths are worth writing to:
- Title tag: ~50–60 characters. Past that, Google truncates the blue link with an ellipsis.
- Meta description: ~150–160 characters. It won’t help your ranking directly, but a description that ends mid-sentence hurts your click-through rate.
Because these are truncation limits, the rule is simple: front-load. Put the words that earn the click first, and treat everything after character 155 as a bonus that might not survive.
Why the short fields are the hard ones
A 2,200-character caption is a canvas. A 150-character bio is a puzzle. The fields with the tightest limits — bios, headlines, titles — are also the ones people read first and remember longest, so they deserve the most editing time per character.
When you’re rewriting a bio for the fifth time, a live counter turns guesswork into a game: trim, watch the number, trim again. The Character Counter also breaks out words and lines, which helps when a platform limits those instead (some ad formats cap headlines by word, not character).
Emoji and links cost more than they look
Two traps catch people right at the limit:
- Emoji don’t cost one character everywhere. Anywhere that counts in UTF-16 — X, for one — a plain 😀 is two, and flags or skin-tone variants can be four or more. The Character Counter counts Unicode code points, which is closer to what you see, so on those platforms treat its number as a floor and leave a little headroom.
- Links usually count in full — except on X, where every URL is shortened to a flat 23 characters. If a long link is eating your bio, a short link or a scannable QR code moves it off the text entirely.
A workflow that keeps you under the line
- Draft freely in the Online Notepad — don’t edit while you write.
- Paste the draft into the Character Counter and note how far over you are.
- Cut from the middle, not the end — the first and last lines are doing the most work.
- Add emoji last, then recheck the count.
Write to the limit and you’ll always sound rushed at the end. Write to about 90% of it, and every post has room to breathe.