Every platform has rules about how many characters you can use. Ignore them and your caption gets truncated, your ad gets rejected, or your bio disappears mid-sentence. Follow them and your content shows up exactly as intended.
This guide lists the character limits for every major platform in 2025, explains what counts as a character, and shows you how to check your count before you post.
What Counts as a Character?
A character is any single unit of text — letters, numbers, spaces, punctuation marks, and symbols each count as one character. Emojis typically count as one or two characters depending on the platform. Line breaks (pressing Enter) usually count as one character as well.
This matters because it’s easy to underestimate your character count when you’re writing in a document editor that doesn’t show counts. A free character counter shows you exactly where you stand in real time.
Character Limits by Platform: Complete 2025 Guide
Twitter / X
- Standard tweet: 280 characters
- Tweet with media attached: 280 characters (media doesn’t reduce the limit)
- Direct messages: 10,000 characters
- Bio: 160 characters
- Display name: 50 characters
- Caption: 2,200 characters (but only the first ~125 show without “more”)
- Bio: 150 characters
- Comment: 2,200 characters
- Username: 30 characters
- Post: 63,206 characters (effectively unlimited for practical use)
- Page description: 255 characters
- Ad headline: 40 characters
- Ad primary text: 125 characters (more shown with “see more”)
- Ad description: 30 characters
- Status update: 3,000 characters
- Article: 120,000 characters
- Headline: 220 characters
- Summary/About: 2,600 characters
- Comment: 1,250 characters
YouTube
- Video title: 100 characters (70 recommended for full display)
- Description: 5,000 characters
- Tags: 500 characters total
- Community post: 500 characters
- Comment: 10,000 characters
TikTok
- Caption: 2,200 characters
- Bio: 80 characters
- Comment: 150 characters
Google/Meta Ads
- Google Search headline: 30 characters each (up to 15 headlines)
- Google Search description: 90 characters each (up to 4 descriptions)
- Meta/Facebook ad headline: 40 characters
- Meta/Facebook primary text: 125 characters
- Meta/Facebook link description: 30 characters
Email subject lines
- Recommended: 40–50 characters (displays fully on most devices)
- Mobile preview: approximately 30–35 characters
- No technical limit, but anything over 60 characters is commonly truncated
SMS / Text messages
- Standard SMS: 160 characters (longer messages are split into multiple segments)
- With special characters (emoji, non-GSM symbols): 70 characters per segment
Why the “First 125” Rule Matters on Instagram and Facebook
On Instagram, only the first 125 characters of a caption show before the “more” link. This means your hook — the reason someone clicks to read more — must land in those first 125 characters.
The same principle applies on Facebook for ads: the primary text shows 125 characters before truncation. For all copy that lives above the fold, shorter and punchier performs better.
Tips for Writing Within Character Limits
Write first, trim second. Don’t constrain yourself while drafting. Write what you want to say, then use a character counter to see where you are and cut from there.
Keep track of what “shows.” Knowing the technical limit isn’t enough — you need to know the display limit. Instagram’s technical limit is 2,200 characters but the visible limit without clicking is 125. Optimize for what people actually see.
Count emoji carefully. Most platforms treat emoji as 2 characters, not 1. If you’re close to a limit, emoji can push you over the edge unexpectedly.
Use a counter before you copy-paste. Text that looks fine in a Word document or Google Doc may be longer than you think when you count the spaces and punctuation. Always check with a character counter tool before pasting into a platform.
For ads, prioritize the headline. Ad headlines are the most constrained (30–40 characters on most platforms) and the most important. Spend extra time making every character count there.
Other Writing Tools to Help You Stay on Track
Beyond character counting, a few other tools help with platform-specific writing:
- Word Counter — track word count alongside character count for longer content
- Keyword Counter — see keyword frequency in captions and ad copy
- Case Converter — quickly convert text to title case, lowercase, or uppercase for headlines
- Auto Capitalize Sentences — fix capitalization quickly when copying text across platforms
Frequently Asked Questions
What is a character in text? A character is any single text unit: a letter, number, space, punctuation mark, symbol, or emoji. Each one counts toward your character total.
How do I count characters in my text? Paste your text into Word Timer’s character counter for an instant count. It shows characters with and without spaces so you can match the right metric to your platform.
Do spaces count as characters? Yes, on most platforms a space counts as one character. Some ad platforms and tools show both “characters with spaces” and “characters without spaces” — make sure you’re referencing the right one.
What’s the character limit for a tweet? Twitter/X allows 280 characters per tweet. Only the first portion is shown in the feed before a “show more” — aim for under 200 characters for tweets that need to be read without clicking.
Do emoji count as characters on Instagram? Yes. Most emoji count as 2 characters on Instagram due to unicode encoding. This can matter when you’re close to a display limit.