The short answer: the limits that actually trip people up are 280 characters for an X post, 160 characters for a single SMS, about 155–160 characters for a meta description, and about 50–60 characters for an SEO title. Everything else on this page is the detail behind those four numbers — the full chart, what happens when you go over each limit, and how to check your own text before you post it.
One thing worth knowing first: most character limits are not about what you are allowed to type. They are about what gets shown. Google does not refuse a 200-character meta description — it cuts it off mid-sentence. X does not stop you at 280 characters — it makes you split the post or pay for a longer one. An SMS over 160 characters still sends — it just arrives as two messages and can cost twice as much. So the skill is not memorising numbers; it is knowing which limits cut, which split, and which block.
The character limits chart
| Where | Limit | What happens if you go over |
|---|---|---|
| X post (standard account) | 280 characters | You must shorten it, split it into a thread, or use a paid account |
| SMS (one message) | 160 characters | It splits into two or more messages (153 characters per part) |
| SMS with emoji or non-Latin text | 70 characters | The message switches to Unicode encoding and the limit drops |
| Meta description | ≈ 155–160 characters | Google truncates it with “…” — there is no hard block |
| SEO title | ≈ 50–60 characters | Google truncates it in search results |
| Instagram caption | 2,200 characters | You cannot post until you shorten it |
| Instagram bio | 150 characters | You cannot save it until you shorten it |
| Facebook post | 63,206 characters | You cannot post until you shorten it (rarely reached) |
| LinkedIn post | 3,000 characters | You cannot post until you shorten it |
| LinkedIn headline | 220 characters | You cannot save it until you shorten it |
| YouTube title | 100 characters | You cannot save it until you shorten it |
| YouTube description | 5,000 characters | You cannot save it until you shorten it |
| WhatsApp message | 65,536 characters | You cannot send it until you shorten it (rarely reached) |
| Google Ads headline | 30 characters each | The ad cannot run until you shorten it |
| Google Ads description | 90 characters each | The ad cannot run until you shorten it |
| Email subject line | No hard limit | Only about 40–50 characters show on most phones |
The pattern to notice: social platforms block you when you exceed the limit, Google truncates you, and SMS splits and charges you. The expensive mistakes are the silent ones — the truncated title and the double-charged text.
SMS: the 160-character rule, explained
SMS is the oldest limit on this page and still the one that costs real money. A single SMS carries 160 characters when the text uses the standard GSM alphabet — plain Latin letters, digits and common punctuation. Go to 161 characters and the phone splits your message into two parts of 153 characters each (7 characters per part are used to say “part 1 of 2”). A 200-character message is therefore two messages, and on a pay-per-message plan it costs twice as much.
It gets worse with emoji. A single 😂 anywhere in the message switches the whole text to Unicode encoding, and the limit drops from 160 characters to 70 characters per message — 67 per part when it splits. That is why a short birthday text with two emoji can arrive as two messages while a plain 150-character message arrives as one. If you are sending bulk SMS for a business, check the encoding before you send, not after the bill arrives.
X: 280 characters, and what actually counts
An X post allows 280 characters on a standard account. Two counting quirks catch people out. First, every link counts as 23 characters, however long the real URL is — X wraps links, so pasting a long link does not eat your post the way it looks like it should. Second, most emoji count as 2 characters, not 1. A post that looks like 270 characters with five emoji in it is really 280.
Paid X accounts can write much longer posts, and the practical way to say more on a free account is a thread: post the first part, reply to it with the second, and so on. Threads work because each post in the thread gets its own 280 characters — but each one still needs to make sense on its own, because readers often meet the middle of a thread first.
Meta descriptions and SEO titles: limits that cut, not block
Google has never published a hard character limit for meta descriptions or titles, because there isn’t one — Google truncates by pixel width, not by character count. A description full of wide letters like “W” gets cut sooner than one full of narrow letters like “i”. As a working rule, aim for 150–160 characters for a meta description and 50–60 characters for a title. That is the range that survives truncation on most screens.
Two consequences follow. First, put the important words early: if Google cuts your description at 155 characters, the words after the cut never existed for the searcher. Second, write for the click, not for the keyword count — a description is an advert for the page, and a truncated sentence that stops mid-promise (“…and the one mistake that”) actually earns fewer clicks than a complete shorter sentence. If you want to check how your own title and description will look, count the characters first, then read them aloud: if the sentence ends naturally before the limit, it is done.
Social captions, bios and the limits you rarely hit
Instagram gives you 2,200 characters for a caption but only 150 characters for a bio — and only the first 125 characters of a caption show before the “…more” link, so the opening line does the real work. LinkedIn allows 3,000 characters per post and 220 characters for a headline; a headline longer than that cannot be saved at all. YouTube allows 100 characters for a title and 5,000 for a description, though only the first 100 or so characters of a description show beside the video.
Facebook’s 63,206-character post limit and WhatsApp’s 65,536-character message limit are so large that almost nobody reaches them by accident — they exist so the platform can say there is a limit, not because anyone writes that much. The practical limit on both is the reader: a 5,000-word Facebook post is technically allowed and almost never read. Google Ads is the strict one in this group: 30 characters per headline and 90 per description, and an ad that breaks either simply cannot run.
How to check your text before you post
Estimates are for planning; when a limit is real, count the actual text:
- X, Instagram, LinkedIn: type the post, then check the count before you publish — most apps show it, and a character counter counts it for you if yours does not.
- SMS: count first, especially if the message has emoji — remember that one emoji can halve your limit from 160 to 70 characters.
- Meta descriptions and titles: count the characters, then read the sentence aloud. If it ends naturally before 160 characters (description) or 60 characters (title), it is done.
- Anything else — a bio, a caption, an ad: paste the text into a character counter and check the count live as you edit, entirely in your browser. Spaces count toward the limit on every platform above, so count the text exactly as you will post it, spaces included.
Frequently asked questions
What happens if my SMS is longer than 160 characters?
It splits into two or more messages of 153 characters each, and on a pay-per-message plan each part is charged separately. A 200-character message costs the same as two messages, not one.
Do spaces count toward the character limit?
Yes — on X, in SMS, on Instagram and everywhere else on this page, spaces count as characters. A 280-character X post with 40 spaces in it has only 240 characters of words. Always count the text exactly as you will post it, spaces included.
How many characters is a meta description?
There is no official limit. Google truncates descriptions by width at roughly 155–160 characters on desktop and about 120 on mobile. Aim for 150–160 characters with the important words first, and the description will usually survive intact.
Why does Google cut off my title?
Titles are truncated by pixel width (about 600 pixels), not by a fixed character count, so wide letters get cut sooner than narrow ones. As a rule, keep titles to 50–60 characters and put the important words at the start.
Does an emoji count as one character?
Not always. On X most emoji count as 2 characters, and in SMS a single emoji switches the whole message to Unicode encoding, dropping the limit from 160 characters to 70. If a message is close to the limit, count the emoji as well as the words.