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.
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Copy that respects each platform's character limits and audience expectations.
Skip the blank-page paralysis. Get launch-ready copy in under 30 seconds.
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.
Real limits from each platform's official ad specs. Exceeding these gets your copy truncated or rejected at review. Bookmark this table.
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.
These rules apply across all five platforms. Ignore either column and you leave CTR, ROAS, and conversions on the table.
Say 'Cut your ad spend by 30%' not 'We offer AI-powered bidding optimization algorithms.'
Numbers stop the scroll. '7-day free trial,' '2,400 customers,' '43% lower CPC' all outperform vague claims.
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.
'Start free trial' beats 'Learn more' every time for conversion campaigns. Be specific about what happens after the click.
Change only the headline OR the primary text between variants, not both. That way you know which element drove the difference in performance.
'The best marketing tool' means nothing. '#1 rated by 800 G2 reviewers' means everything. Platform policies also flag unsupported superlatives.
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.
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.
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.
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.
The difference between 0.5% CTR and 3% CTR is usually the copy. Here are three concrete rewrites showing exactly what changes and why.
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(No CTA button in RSA)
Reddit Marketing, Automated
Find subreddits where your buyers are. Post content that ranks. Track traffic from Reddit to your site.
(Each headline works standalone)
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.
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.
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.
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.
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.
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.
MediaFast helps founders reach thousands of buyers through Reddit posts that compound over time, no ad spend required.