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MediaFast

Free AI Ad Copy Tool

Generate Ad Copy That Converts.

Write platform-native ad copy for Reddit, LinkedIn, Facebook, Google, and Twitter in seconds. Paste your offer, pick your settings, and get ready-to-launch copy.

Ad Configuration

Customize your ad copy

Your Ad Copy

Ready to launch

Ready to Write?

Describe your offer and your platform-native ad copy will appear here.

Platform-Native Copy

Copy that respects each platform's character limits and audience expectations.

Save Hours Per Campaign

Skip the blank-page paralysis. Get launch-ready copy in under 30 seconds.

The Short Answer

Ad Copy Generator: The TL;DR

What Is an Ad Copy Generator?

An ad copy generator is an AI tool that writes the text elements of a paid advertisement: headline, primary text, description, and CTA. It applies each platform's character limits automatically so you get launch-ready copy for Reddit Ads (300-char headlines), LinkedIn Ads (70-char headlines), Facebook/Meta (40-char headlines), Google RSA (30 chars per headline, 90 per description), or Twitter/X (280-char body) without memorizing the rules yourself. You describe your offer, pick your settings, and get copy in under 30 seconds.

When Ad Copy Works

You have a clear, specific offer. A defined discount, free trial, or limited-time deal gives the copy a hook that drives clicks.
Your audience has active search intent. Google Ads work best when people are already searching for your category of solution.
You target a narrow, well-defined audience. LinkedIn Ads converting at a low CPC require precise job title and company size targeting.
You test multiple variants simultaneously. Campaigns with 3 or more creative variations consistently outperform single-variant campaigns.
Your landing page matches the ad message. Message match between ad copy and landing page headline reduces bounce rate and lifts conversions.
You have enough budget for statistical significance. At least $5 to $10 per variant per day for 5 to 7 days before drawing conclusions.

When Ad Copy Does Not Work

The offer is vague or generic. 'Best software for your business' gives readers no reason to click over every other ad they see.
Budget is too thin to test. Spending $2/day on a single variant tells you nothing actionable after 7 days.
The landing page is mismatched. Copy promising a free trial that leads to a pricing page kills conversions immediately.
You write for yourself, not the audience. Internal jargon and feature lists mean nothing to someone scrolling their feed for 2 seconds.
You never refresh creative. Ad fatigue sets in within 2 to 4 weeks on most platforms. Stale copy sees CTR drop 40 to 60%.
You ignore platform content policies. Reddit bans ads with superlatives. Meta restricts certain health and financial claims. Noncompliant copy gets rejected and wastes setup time.
Platform Limits

Ad Platform Character Limits (2026 Reference)

Real limits from each platform's official ad specs. Exceeding these gets your copy truncated or rejected at review. Bookmark this table.

Platform
Headline Limit
Primary Text Limit
CTA Options
Best For
Reddit Ads
300 chars
300 chars
Learn More, Sign Up, Shop Now, Download, Watch Now, Apply Now (custom text up to 20 chars)
Developer, founder, and niche B2B audiences
LinkedIn Ads
70 chars
150 chars (intro text, truncates at 150 on mobile)
Learn More, Sign Up, Download, Apply Now, Request Demo, Get Quote
B2B, enterprise, recruiting, professional services
Facebook / Meta
40 chars
125 chars before 'See More' truncation
Learn More, Shop Now, Sign Up, Download, Apply Now, Get Offer, Book Now
Consumer, DTC, B2C, broad audience retargeting
Google Ads (RSA)
30 chars per headline (up to 15 headlines)
90 chars per description (up to 4 descriptions)
Built into extensions (Sitelinks); no in-ad CTA button
High search intent, direct response, any category
Twitter / X Ads
70 chars
280 chars (body copy / tweet text)
Learn More, Sign Up, Shop Now, Download, Apply Now, Book Now (button text up to 20 chars)
Tech, news, pop culture, founder and developer audiences

Note: Google RSA headlines do not have a standard CTA button inside the ad unit itself. Calls to action in Google Ads are written into the headlines and descriptions directly, not selected from a dropdown. Ad extensions like Sitelinks and Callouts add supplementary CTAs below the main ad.

Writing Rules

Ad Copy Do's and Don'ts: 5 Rules Per Side

These rules apply across all five platforms. Ignore either column and you leave CTR, ROAS, and conversions on the table.

Do This

Lead with the benefit, not the feature

Say 'Cut your ad spend by 30%' not 'We offer AI-powered bidding optimization algorithms.'

Include one specific number

Numbers stop the scroll. '7-day free trial,' '2,400 customers,' '43% lower CPC' all outperform vague claims.

Match platform tone exactly

Reddit users reward conversational honesty. LinkedIn users expect professional credibility signals. Google searchers want direct answers. Write for the feed, not for a press release.

Write a CTA that names the next action

'Start free trial' beats 'Learn more' every time for conversion campaigns. Be specific about what happens after the click.

Test one variable at a time

Change only the headline OR the primary text between variants, not both. That way you know which element drove the difference in performance.

Don't Do This

Don't use superlatives without proof

'The best marketing tool' means nothing. '#1 rated by 800 G2 reviewers' means everything. Platform policies also flag unsupported superlatives.

Don't cram multiple CTAs into one ad

Asking someone to 'Read the blog, watch the video, and sign up for a demo' in one ad creates decision paralysis. One ad, one action.

Don't write longer than the truncation limit

On Facebook/Meta, primary text over 125 characters gets cut with a 'See More' link. Most people never click it. Write within the visible limit.

Don't use jargon your audience has not adopted yet

Founders and developers know 'LTV/CAC.' Consumers do not. Marketing jargon in consumer ads destroys trust. Match the exact vocabulary your audience uses in their own posts.

Don't skip image-copy message match

Ad creative (the image or video) and ad copy must tell the same story. A mismatched combo, like a corporate stock photo with casual copy, reads as untrustworthy and tanks CTR.

Before vs. After

3 Ad Copy Rewrites: Weak vs. Strong

The difference between 0.5% CTR and 3% CTR is usually the copy. Here are three concrete rewrites showing exactly what changes and why.

Facebook / Meta Ad
Before (Weak)
Headline

Marketing Tool for Your Business

Primary Text

We offer a powerful AI marketing platform that helps businesses grow faster and achieve their goals.

CTA

Learn More

After (Strong)
Headline

Reddit Ads on Autopilot

Primary Text

2,400 SaaS founders use MediaFast to get organic Reddit traffic without getting banned. 7-day free trial.

CTA

Start Free Trial

Why it works: The 'after' headline names the specific outcome (Reddit Ads on autopilot). The primary text includes a real number (2,400 founders), names a pain point (getting banned), and ends with a clear offer (7-day free trial). The CTA names the action, not a generic 'Learn More.'
LinkedIn Ad
Before (Weak)
Headline

Improve Your Marketing Results

Primary Text

Our solution helps B2B companies improve their marketing strategy and generate more leads.

CTA

Sign Up

After (Strong)
Headline

43% Lower CPC on Reddit Ads

Primary Text

SaaS founders spend $43 less per click using Reddit organic vs. LinkedIn Ads. See how MediaFast makes it work.

CTA

See How It Works

Why it works: The 'after' headline leads with a specific metric (43% lower CPC). The primary text compares two channels the target audience cares about and positions the tool as the bridge. The CTA creates curiosity without overselling.
Google Ads (RSA)
Before (Weak)
Headline

Best Marketing Software 2026

Primary Text

Comprehensive marketing solution for businesses of all sizes. Get started today.

CTA

(No CTA button in RSA)

After (Strong)
Headline

Reddit Marketing, Automated

Primary Text

Find subreddits where your buyers are. Post content that ranks. Track traffic from Reddit to your site.

CTA

(Each headline works standalone)

Why it works: Google rotates RSA headlines independently, so each must work in isolation. 'Reddit Marketing, Automated' is 28 characters and states the exact outcome. The description lines describe three sequential actions, matching informational search intent for this keyword category.
Paid vs. Organic

Why Reddit Organic Beats Paid Ads for Most Founders

Paid ads give you speed. Reddit organic gives you compounding trust. Here is when each makes sense, and why smart founders often choose the latter.

Paid Ads Stop When You Stop Paying

Every click on a paid ad costs money. The moment you pause a campaign, traffic drops to zero. Reddit posts, on the other hand, live in subreddit feeds and Google search results for months. A single well-placed post can drive hundreds of visits per week at $0 per click, months after you wrote it.

Community Trust Converts Better

Reddit users are 3x more likely to click a product link when it comes from a helpful community post versus a promoted ad. The platform has trained its users to distrust ads. Organic mentions inside relevant subreddit discussions carry social proof by default. That trust translates directly into lower cost per acquisition.

No Minimum Budget Required

Meaningful paid ad campaigns on LinkedIn or Google require $1,500 to $3,000 per month to generate statistically significant data. Reddit organic costs your time, not your budget. Tools like MediaFast automate the entire process so even a solo founder can run a consistent Reddit presence without spending 10 hours per week on it.

Paid Ads vs. Reddit Organic: Head-to-Head

Metric
Paid Ads
Reddit Organic
Cost per Click
$0.50 to $15+ (platform dependent)
$0 (your time only)
Time to First Results
24 to 48 hours after launch
3 to 7 days per post
Traffic Longevity
Stops when budget stops
Months to years per post
Audience Trust Level
Low (ad label visible)
High (community context)
Minimum Monthly Budget
$1,500+ for meaningful data
$0 (tool optional)
Scalability
Linear (spend more, get more)
Compounding (posts build on each other)
Creative Fatigue
Every 2 to 4 weeks
Rare (new posts, new subreddits)
Ban Risk
Policy violations get ads rejected
Low with platform-aware posting strategy

The founder's playbook: Use paid ads for rapid testing of messaging and offers during your first 90 days. Once you find the copy that converts, replicate that message across Reddit subreddits where your audience already hangs out. MediaFast helps you do exactly that, taking proven ad copy angles and adapting them into organic Reddit posts that build trust instead of burning budget.

Ad Copy Generator FAQ

Everything you need to know about writing ad copy that converts across every major platform.

Yes, the Ad Copy Generator is 100% free to use with no account required. You can generate ad copy for any of the five supported platforms (Reddit Ads, LinkedIn Ads, Facebook/Meta, Google Ads, Twitter/X) as many times as you need. For founders who want to complement paid ads with organic acquisition, tools like MediaFast help you reach thousands of potential customers through Reddit without spending a dollar on clicks.

The generator supports five major advertising platforms: Reddit Ads, LinkedIn Ads, Facebook/Instagram (Meta), Google Ads (Responsive Search Ads), and Twitter/X Ads. Each platform has its own character limits baked in. Reddit Ads allow up to 300 characters for headlines, LinkedIn Ads cap headlines at 70 characters, Facebook/Meta headlines max out at 40 characters, Google RSA headlines are 30 characters each, and Twitter/X body copy allows up to 280 characters.

Here are the key limits: Reddit Ads headline 300 chars, primary text 300 chars. LinkedIn Ads headline 70 chars, intro text 150 chars, description 70 chars. Facebook/Meta headline 40 chars, primary text 125 chars before truncation, description 30 chars. Google RSA each headline 30 chars (up to 15 headlines), each description 90 chars (up to 4). Twitter/X headline 70 chars, body copy 280 chars.

High-converting ad copy follows a simple formula: lead with the benefit, not the feature; include a specific number or proof point; match the audience's language; and end with a single clear call to action. For Facebook and Instagram, the first 3 words of primary text must hook scrollers. For Google RSA, each headline must work standalone since Google rotates them. For LinkedIn, professional proof points like client names or metrics outperform generic claims. For Reddit, conversational copy that sounds like a real user recommendation performs best.

The headline is the bold, prominent line that appears directly on the ad creative or under the image. It must grab attention in under 2 seconds and is the most-read part of any ad. Primary text (also called body copy or intro text depending on the platform) appears above or below the image and gives more context, handles objections, and drives the CTA. On Facebook/Meta, primary text appears above the image. On LinkedIn, it is called intro text. On Reddit, it is the main body of the promoted post.

Yes. Check the 'Generate 3 variants' option before clicking generate. The AI will return three distinct versions with meaningfully different angles or hooks, all labeled clearly as Variant 1, Variant 2, and Variant 3. This is useful for A/B testing. Run each variant for at least 3 to 5 days and 1,000 impressions before making optimization decisions based on CTR or conversion rate.

LinkedIn Ads is the strongest platform for pure B2B targeting because you can filter by job title, company size, industry, and seniority. However, LinkedIn CPCs are expensive ($6 to $15 per click for competitive B2B audiences). Reddit Ads offer a more cost-effective alternative for developer, founder, and technical audiences because those communities organically discuss professional tools. Google Ads works best when there is strong search intent around your solution category. Facebook/Meta works for B2B only if you have a well-built lookalike audience.

Reddit Ads require a different approach than other platforms. Reddit users are highly skeptical of traditional advertising. The best Reddit Ads copy sounds like a helpful post from a real user, not a corporate ad. Lead with a genuine problem statement your audience recognizes. Avoid superlatives like 'best' or 'most powerful.' Skip the corporate-speak. Include a specific stat or result if possible. Reddit allows promoted posts that blend into the feed, so copy that reads naturally performs far better than copy that screams 'advertisement.' Check Reddit's content policies because certain categories face extra restrictions.

Test at least 3 headline variants and 2 primary text variants before scaling budget. That gives you 6 combinations to test. Run them in equal split with at least $5 to $10 daily budget per variant for 5 to 7 days. Evaluate based on CTR (click-through rate) for awareness goals and cost per conversion for performance goals. On Google RSA, Google automatically rotates up to 15 headlines and 4 descriptions, so provide as many strong options as possible and let the algorithm find the best combinations.

AI ad copy generators eliminate blank-page paralysis and instantly apply platform-specific rules (character limits, tone expectations, CTA options) that take experience to learn. They also generate multiple angles quickly, which is the single biggest driver of ad performance since most winning ads come from the 5th or 6th creative variation, not the first draft. The tool handles the first draft in 30 seconds; your job is to refine, personalize with real proof points, and A/B test. Think of it as a fast starting point with all the formatting constraints pre-applied.

Paid Ads Burning Budget? Try Reddit Organic Instead.

MediaFast helps founders reach thousands of buyers through Reddit posts that compound over time, no ad spend required.

mediafa.st / find-subreddits
How it works
AI search → Reddit → Sales
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"Founders use MediaFast for Reddit"
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Traffic compounds
+412%in 30 days
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