Character Limits for Social Media, Meta Descriptions, and Email Subject Lines

A strong message can fail before anyone reads it. A social platform may reject a post that is too long, a search result may cut off the most useful part of a description, and an inbox may hide the end of an email subject line. The difficulty is that these limits do not all work in the same way. Some are hard technical maximums. Others are practical targets shaped by screen size and interface design.

Before publishing, paste your copy into the SmartBear Character Counter to check the total with and without spaces. This is especially useful when a caption includes links, hashtags, emoji, or line breaks that may count differently across platforms.

Last verified: October 18, 2026. Platform limits can change by account type, publishing method, region, or product update. Check the platform composer before scheduling an important campaign.

Character Limits at a Glance

Format	Maximum or Target	Practical Note
X standard post	280 characters	Links are converted to a fixed-length URL and affect the remaining count.
X longer post	Up to 25,000 characters	Available to eligible paid subscribers.
LinkedIn post	3,000 characters	Put the main point before text is collapsed in the feed.
Threads post	500 characters	Longer text can be added as a separate attachment where available.
Instagram caption	2,200 characters	Hashtags, mentions, spaces, and line breaks use the same caption field.
Facebook post	63,206 characters	The technical maximum is far longer than the text normally visible in the feed.
TikTok caption	Up to 4,000 characters in the native app	Third-party publishing tools or API routes may allow less.
YouTube video title	100 characters	Lead with the topic because the full title may not appear everywhere.
YouTube description	5,000 characters	The opening lines appear before viewers expand the description.
Meta description	No fixed Google limit	About 150 to 160 characters remains a practical drafting range.
Email subject line	No universal hard limit	Aim for 60 characters or fewer, then test on mobile.

The maximum tells you whether a platform will accept the text. It does not tell you how much a reader will see before a “more” link, truncation, or a narrow mobile screen hides the rest.

Social Media Character Limits

X Posts

A standard X post supports up to 280 characters. According to X Help, longer posts can reach 25,000 characters for eligible subscribers. A link is shortened by the platform and uses a fixed portion of the count, so the visible URL length is not a reliable guide.

For standard posts, write the central statement first. Remove introductions that delay the point. If the post needs several claims, sources, or steps, use a thread or link to the complete resource instead of compressing every idea into one block.

LinkedIn Posts

LinkedIn Help states that a regular post can contain up to 3,000 characters. That provides room for a short explanation, but readers may see only the opening lines before the post is collapsed.

Treat the first sentence like a summary, not a teaser that withholds the subject. Name the problem, finding, or useful result early. Use short paragraphs and intentional line breaks so the post remains readable on a phone.

Threads Posts

Standard Threads posts support up to 500 characters. Meta has also introduced text attachments containing up to 10,000 characters, which are separate from the main post. The original 500-character field still matters because it carries the opening message and any link you want readers to notice.

Use the main post for one complete thought. If you add a longer attachment, make the post explain what the attachment contains and why it is worth opening.

Instagram and Facebook Captions

Instagram captions commonly allow up to 2,200 characters, while Facebook posts have a much larger technical ceiling. Neither maximum should be treated as a recommended length. Both feeds hide part of longer copy, and the visible amount can change across devices and placements.

Put essential context before hashtags and secondary details. If a post promotes an event, product, or article, name it near the beginning and make the next action clear before the caption expands.

TikTok Captions

TikTok’s native publishing experience currently supports captions of up to 4,000 characters, although third-party tools may enforce a smaller API limit. Captions share their available space with mentions and hashtags.

A large allowance does not make a long opening effective. Viewers first encounter the video and a small portion of the caption. State the topic and useful context early, then use the remaining space for explanation, attribution, or searchable wording.

YouTube Titles and Descriptions

YouTube Help specifies a 100-character maximum for video titles and 5,000 characters for descriptions. Titles should remain understandable when shortened in search results, recommendations, or notifications.

Use the first lines of the description to explain what the viewer will learn. Place supporting links, credits, chapters, and detailed notes afterward. A 5,000-character allowance is useful for reference information, but it does not make every video description a long-form article.

Meta Description Length for Search Results

Google does not impose a fixed character limit on the meta description element. Its snippet guidance explains that descriptions are shortened as needed to fit the device. Google may also replace the supplied description with text from the page when that text better matches a search.

A drafting target of roughly 150 to 160 characters remains useful because it encourages a focused summary. It is not a ranking requirement or a guarantee that every character will appear. Write a unique description that identifies the page, communicates its value, and uses the main topic naturally.

What to Put Near the Beginning

• The page’s main subject or answer
• The specific reader problem it addresses
• A meaningful detail that distinguishes the page
• The focus keyphrase when it fits naturally

Avoid repeating the title word for word. The title names the page, while the description should add enough context to help a searcher decide whether the page answers the query.

Email Subject Line Length

Email does not have one universal subject-line limit. Mail services can accept long text, but inboxes show different amounts depending on the application, device, font, and screen width. The end of a subject can disappear even when the message sends successfully.

Mailchimp recommends using no more than nine words and 60 characters as a practical starting point. That is guidance rather than a technical rule. Your own audience data is more useful than a universal target, especially if most subscribers read on mobile.

Front-load the specific information. “Friday deadline for Q4 expense claims” remains useful when shortened. “A quick reminder about something you need to complete” may hide the actual request.

What Counts as a Character

Most counters include letters, numbers, punctuation, and spaces. Platforms may also count line breaks, hashtags, mentions, and links. Emoji are more complicated because one visible symbol can be formed from several Unicode code points. Skin-tone modifiers, family combinations, and flags may use more storage units than they appear to use on screen.

A browser-based counter gives you a reliable drafting total, but the platform composer remains the final authority. Paste the finished copy into the destination before scheduling it, particularly when the text is close to the maximum.

How to Write Better Copy Within a Limit

1. Write the full message first.
   Capture the meaning before trimming. Starting with an artificially short draft can remove necessary context.
2. Move the main point forward.
   Make the first sentence useful even when the remaining text is hidden.
3. Remove repeated ideas.
   If two sentences make the same point, keep the clearer one.
4. Replace long phrases.
   Change “in order to” to “to” and “at this point in time” to “now.”
5. Protect essential details.
   Do not cut dates, conditions, attribution, safety information, or the action a reader must take merely to reach a target.
6. Count the final version.
   Check spaces, links, hashtags, mentions, line breaks, and emoji before publishing.

Common Questions About Character Limits

Do Spaces Count as Characters

Yes. In most text fields, every space contributes to the total. Line breaks may count as one or more underlying characters depending on the platform.

Do Hashtags and Mentions Count

Usually. The letters, numbers, and symbols in a hashtag or mention generally use the same field allowance as the rest of the post.

Is a Shorter Post Always Better

No. Copy should be as short as the task allows, but it still needs enough context to be accurate and useful. A customer update, policy explanation, or safety notice may require more detail than a promotional caption.

Why Do Two Character Counters Show Different Results

They may use different rules for emoji, combined Unicode characters, line endings, or spaces. A tool might count visible characters, code points, or encoded units. Use the method that matches the platform you are preparing the text for.

Check the Limit Before You Publish

Character limits are easier to manage when you separate the technical maximum from the amount readers are likely to see. Start with the main point, keep important details near the beginning, and shorten the draft without removing necessary meaning.

Because platforms revise their products, verify important limits periodically and update reference content when the rules change. A final character check takes seconds and prevents rejected posts, hidden subject lines, and descriptions that lose their point halfway through.