The Character Limit Blog
Everything you need to write better copy for every major platform โ Instagram, Twitter/X, Facebook, Pinterest, Google Ads, SEO, SMS, Email and Amazon.
How to Write Copy for Every Social Media Platform 2026
The complete framework โ one source, adapted for every platform.
WhatsAppWhatsApp Business Character Limits 2026: Complete Guide
Messages, business name, catalog and quick replies explained.
GuideHow Long Should Your Instagram Caption Be in 2025?
The data-driven answer โ why 125 characters matters more than 2,200.
StrategyInstagram Hashtag Strategy 2025: How Many Should You Use?
The 30-hashtag era is over. Here's what the data says about optimal usage.
TipsInstagram Bio Tips: 150 Characters That Convert
Pack your value proposition and CTA into 150 characters on your profile.
AdsInstagram Ads Character Limits 2025: Every Field Explained
Primary text (125), headline (40), description (30) โ all fields covered.
ReelsInstagram Reels Captions: Do They Actually Matter?
How Reels captions affect reach and what to write for each content type.
DMsInstagram DM Character Limit & Cold DM Templates That Work
The 1,000-char DM limit plus proven outreach templates that get replies.
Twitter/X Character Limit: The Complete 2025 Guide
280-char limit, URL counting, Premium limits and how to write better tweets.
ThreadsHow to Write Twitter Threads That Go Viral in 2025
Thread structure, hook formulas and endings โ the full playbook.
ProfileTwitter/X Bio: How to Use Your 160 Characters Effectively
Convert profile visitors to followers with a bio that actually works.
AdsTwitter/X Ads Character Limits: Every Format Explained
Promoted tweets, website cards, app cards โ all limits and best practices.
EngagementTweet Length vs Engagement: What the Data Shows in 2025
Is shorter always better? The data on tweet length might surprise you.
PollsTwitter/X Polls: Character Limits, Best Practices & Ideas
25-char poll options โ how to write great polls that drive votes and replies.
Google Ads Character Limits: The Complete 2025 Guide
Every field โ RSA headlines (30), descriptions (90), paths (15) with examples.
Headlines15 RSA Headlines That Actually Work (30 Chars Each)
A repeatable framework for writing all 15 RSA headlines in 30 characters.
CopyHow to Write Google Ads Descriptions in 90 Characters
Features vs benefits, CTAs, power words โ the copywriting formula.
ExtensionsGoogle Ads Extensions: Character Limits & Best Practices
Sitelinks, callouts, structured snippets โ every extension format explained.
Quality ScoreHow Ad Copy Affects Your Google Ads Quality Score
The link between your copy, landing page and QS โ with a practical checklist.
PMaxPerformance Max Asset Limits: Ad Copy Guide for 2025
Headline (30), long headline (90), description (90), business name (25).
Meta Descriptions That Actually Get Clicks in 2025
Length, keywords, CTAs โ the complete guide to high-CTR snippets.
Title TagsHow to Write Title Tags That Rank AND Get Clicked
60 characters, keyword placement, brand names โ the definitive guide.
Open GraphOpen Graph Tags: Complete Guide for Better Social Sharing
OG title, description, image sizes for Facebook, LinkedIn, Twitter and WhatsApp.
Examples25 Meta Description Examples: Good, Bad, and Great
Real before-and-after examples from ecommerce, SaaS, blogs and local businesses.
CTRHow to Improve Your Google SERP Click-Through Rate in 2025
Title tags, rich snippets, schema markup โ every lever for better CTR.
SchemaSchema Markup for Beginners: Get Rich Snippets in 2025
FAQ, HowTo, Product, Article schema โ step-by-step for non-developers.
Amazon Listing Optimisation: The Complete 2025 Guide
Title, bullets, description, keywords โ every field with strategy and limits.
TitlesHow to Write Amazon Product Titles That Rank and Convert
200-char limit, mobile truncation at 80 chars, keyword placement formula.
BulletsAmazon Bullet Points: 5 Formulas That Drive More Sales
500 characters per bullet โ formulas that convert browsers into buyers.
KeywordsAmazon Backend Keywords: The 250-Byte Guide for Sellers
What to include, what to avoid, and how to find the right hidden keywords.
A+ ContentAmazon A+ Content: Limits, Best Practices and Templates 2025
Replace your description with rich modules โ character limits per module type.
SEOAmazon SEO in 2025: How the A10 Algorithm Actually Works
Conversion rate, velocity, external traffic โ the ranking signals that matter.
Word counter, YouTube checker and the complete cheat sheet
Word Counter & Readability Score
Count words, characters, sentences โ plus Flesch-Kincaid score, grade level, reading time and keyword density.
ToolYouTube Title & Description Checker
Check title (100 chars), description (5,000 chars) and tags with a live YouTube search snippet preview.
ReferenceSocial Media Character Limits 2025 โ Complete Cheat Sheet
Every character limit for 16 platforms in one page โ Instagram, Twitter, LinkedIn, TikTok, YouTube, SMS, Email and more.
SMS Character Counter โ GSM-7 & Unicode Segment Calculator
Check your SMS encoding, segment count and estimated send cost in real time. Free.
GuideSMS Character Limit 2026: 160 vs 70 Characters Explained
GSM-7 vs Unicode encoding, segment math, and why one emoji can triple your cost.
BillingSMS Segments Explained: Why Your Text Costs More Than You Think
The 153/67-character multi-part math behind SMS billing.
MarketingSMS Marketing Character Limits: Best Practices for 2026
Anatomy of a high-converting SMS marketing message within 160 characters.
ComparisonMMS vs SMS: Character Limits, Costs and When to Use Each
1,600 characters plus media vs 160 characters text-only โ the full comparison.
Facebook Character Limits 2026: Every Field Explained
Post, ad, bio and page limits โ with engagement benchmarks for each.
AdsFacebook Ads Character Limits: Headlines, Text & Descriptions
How to write within Facebook's tightest ad constraints.
StrategyIdeal Facebook Post Length for Maximum Engagement
What the data says about post length and Facebook's algorithm.
Pinterest Character Limits 2026: Pins, Boards & Profile
Every Pinterest field explained, with SEO strategy for the 500-character pin description.
SEOPinterest SEO: Writing Pin Descriptions That Get Found
Pinterest is a visual search engine โ here's how to use your 500 characters for discovery.
AdsPinterest Ads: Character Limits for Promoted Pins
Title, description and headline limits for Pinterest's advertising formats.
Email Subject Line Length 2026: The Complete Data-Backed Guide
30-50 characters is the sweet spot โ the research and device-by-device breakdown.
PreheaderEmail Preview Text (Preheader): The Underused Second Headline
Most marketers leave it blank. Here's how to use the 40-90 character field.
OutreachCold Email Subject Lines: What 5.5 Million Emails Reveal About Length
Shorter wins for cold outreach โ the data on 2-4 word subject lines.
Threads Character Limit 2026: Posts, Bio & Text Attachments
500 characters per post โ how Threads compares to Twitter/X and Bluesky.
BlueskyBluesky Character Limit 2026: 300 Characters Explained
Bluesky's post and bio limits, and its domain-based handle system.
DiscordDiscord Character Limits 2026: Messages, Nicknames & Embeds
2,000 for free users, 4,000 for Nitro, and separate embed limits for bots.
RedditReddit Character Limits 2026: Titles & Comments
300-character titles, 10,000-character comments, and how to write both well.
SnapchatSnapchat Character Limits 2026: Captions & Usernames
250-character captions and a strict 15-character username limit.
Resume & LinkedIn Character Limits: What Actually Fits
LinkedIn headline (220), About section (2,600), and resume summary best practices.
CollegeCommon App Essay Word Limit: The 650-Word Hard Cap Explained
Why the system blocks submission past 650 words, and how to edit down without losing your point.
Platform-vs-platform and tool-vs-tool breakdowns
Character Counter vs Word Counter: What's the Difference?
They measure different things and serve different constraints โ here's when to use each.
ComparisonTwitter/X vs Threads vs Bluesky: Character Limit Comparison
280 vs 300 vs 500 characters, side by side, with guidance on which fits which writing style.
ComparisonSMS vs iMessage: Why One Has a Character Limit and the Other Doesn't
What happens when iMessage silently falls back to SMS segment math.
British English versions for UK search and Amazon.co.uk
Title Tag Optimisation for UK SEO: Character Limits & Best Practice
Why British spelling itself affects UK rankings, and how to write titles that get clicked.
UK AmazonAmazon.co.uk Listing Optimisation: A UK Character Limits Guide
UK terminology swaps and backend keyword strategy for Amazon.co.uk sellers.
UK CareersCV & LinkedIn Character Limits: A UK Guide
CV, not resume โ UK-specific conventions and LinkedIn field limits.
UK CareersHow Long Should a CV Be? UK Length & Format Guide 2026
Two A4 pages is standard โ section-by-section length guidance for UK CVs.