Generate high-converting ad copy for Facebook, Google, Instagram, LinkedIn, and TikTok with a free AI tool. Plus the proven formulas behind ads that work.
Ad copy is the written text of an advertisement the headline, body, and call to action and its job is to move a specific person to take a specific action. Strong ad copy isn't a matter of clever wording; it follows repeatable structures that have been tested across millions of ad impressions. This guide covers those structures, the character limits for each major platform, and how to generate platform-optimized copy in seconds. Try the free AI Ad Copy Generator → Why Most Ad Copy Fails Three failure modes account for the overwhelming majority of underperforming ads: It describes the product instead of the outcome. "Project management software with Gantt charts and time tracking" describes features. "Stop chasing status updates in three different apps" describes the reader's actual problem. It talks to everyone. Copy written for a broad audience resonates with no one. Ads that convert name a specific situation the reader recognizes as their own. It has no clear next step. A reader who finishes your ad and doesn't know exactly what to do next will do nothing. The Four Formulas Worth Knowing AIDA - Attention, Interest, Desire, Action The oldest structure in advertising and still the default for longer-form ads. Attention: a hook that stops the scroll Interest: a detail that makes them keep reading Desire: the outcome they'd get Action: what to do now PAS - Problem, Agitate, Solution The highest-performing structure for social ads, because it leads with something the reader already feels. Problem: name the pain Agitate: make the cost of it concrete Solution: your product as the way out Example: "Spending Sunday nights rebuilding the same spreadsheet? That's 4 hours a week 200 hours a year on work a template does in one click. Here's the template." BAB - Before, After, Bridge Strong for transformation-based offers. Before: their world now After: their world once solved Bridge: your product as the crossing FAB - Features, Advantages, Benefits Best for technical or B2B products where specs genuinely matter but always translate each feature into what it means for the buyer. Platform Character Limits Writing without knowing the limits means having your best line truncated. Reference table: Platform Field Limit Google Ads Headline (×3) 30 characters each Google Ads Description (×2) 90 characters each Facebook / Instagram Primary text 125 chars before "See more" Facebook / Instagram Headline 40 characters Facebook / Instagram Link description 30 characters LinkedIn Intro text 150 chars before truncation LinkedIn Headline 70 characters X (Twitter) Post copy 280 characters TikTok Ad text 100 characters Pinterest Title 100 characters Front-load the important words. On every platform in that table, the first line is the one that decides whether anyone reads the second. Use a word counter to check character counts before uploading a headline cut mid-word is a wasted impression. Copy Differs by Platform Because Intent Differs Google Ads reaches people actively searching for a solution. They already know they have the problem. Match their search language, state what you offer plainly, and lead with the differentiator price, speed, guarantee. Facebook and Instagram reach people who weren't looking for anything. Interruption-based, so the hook does all the work. PAS performs well here because it opens with a feeling rather than a product. LinkedIn reaches professionals in work mode. Credibility and specificity outperform hype; concrete numbers and role-specific language work better than bold claims. TikTok rewards copy that sounds like a person talking, not a brand advertising. Ads styled like native content consistently outperform polished corporate messaging. Using AI for Ad Copy (Without Sounding Like AI) AI is genuinely good at volume generating twenty angles in the time it takes to write one which matters because ad performance is driven by testing, not by writing one perfect ad. Where it needs your input: Give it specifics. "Ad for a productivity app" produces generic output. "Ad for freelance designers who lose billable hours to client email threads" produces something usable. Generate wide, then cut hard. Produce ten variants, keep the two with genuinely different angles, discard the rest. Edit the voice. AI tends toward smooth and slightly formal. Real ad copy is often shorter, blunter, and more conversational than what comes out of the box. Never ship claims unchecked. AI will happily invent statistics and guarantees. Verify anything factual before it goes live. The AI Ad Copy Generator produces copy formatted for Facebook, Google, Instagram, Pinterest, LinkedIn, TikTok, YouTube, Snapchat, and X, with each platform's constraints already applied. For organic social rather than paid, the Social Media Post Generator and AI Caption Generator cover the same ground. What to Test First Testing everything at once tells you nothing. Order of impact: The hook / first line — largest single lever on performance The offer framing