Is your landing page built to convert?
Paste any landing page HTML. Get a rule-based score across nine conversion factors: headline, CTA, social proof, copy depth, heading hierarchy, mobile, trust, forms, and load weight. Runs in your browser. Nothing is uploaded.
What this analyzer actually checks.
Landing page conversion rests on a handful of structural patterns that show up in the HTML before any visual design lands. The analyzer reads the markup and grades each factor against published benchmarks. Here is the full list of checks and the research behind each.
Headline Hero
Optimal H1 length: 5 to 12 words
Reads the H1 tag. Pages with one specific outcome-driven H1 in the 5 to 12 word band perform best in Nielsen Norman eye-tracking studies. Fewer than 4 words usually lacks specificity. More than 12 starts losing scanability, especially on mobile.
CTA Action
3 to 5 CTAs of the same intent, with a verb
Counts links and buttons that contain action verbs (start, get, try, join, download, claim, book, request, buy, reserve). Flags generic CTAs like "Submit" or "Click here". HubSpot's 40,000-page study found pages with outcome-driven CTAs outperform generic ones by 28%.
Social proof Trust
Testimonial language + specific numbers
Searches the body text for proof keywords (testimonial, review, customer, trusted by, case study, rating) and for specific stats (12,000 users, 87% conversion). Pages with both qualitative and numeric proof convert ~30% higher than pages with neither (BrightLocal).
Copy depth Body
100 to 300 words (opt-in) or 800 to 2000 (paid)
Counts the visible body words. Short-form (100 to 300) works for free offers. Long-form (800 to 2000) converts paid and high-ticket offers better, because the reader has more objections to handle. Under 100 words almost never converts well.
Heading hierarchy Structure
Exactly one H1, multiple H2s, no skipped levels
Audits the H1 to H6 sequence. Exactly one H1 is required. Two or more H2s break the page into scannable sections. An H3 appearing before any H2 signals a broken hierarchy that hurts SEO and screen-reader accessibility.
Mobile readiness Layout
Viewport meta + media queries / responsive units
Checks for the viewport meta tag and counts responsive declarations (@media, max-width, vw, clamp, percentages). Mobile drives ~60% of landing page traffic. Pages without a viewport tag render at desktop width and double-tap zoom.
Trust language Risk
Privacy, guarantee, refund, secure, cancel anytime
Searches for risk-reversal language. The strongest converters always reduce perceived risk: "No credit card required", "30-day money-back guarantee", "Cancel anytime", or a one-line privacy mention near the form.
Form length Friction
3 fields or fewer for top-of-funnel
Counts visible input fields in each form. HubSpot's analysis of 40,000 forms found ~10% conversion drop per added field beyond 3. Six is the upper bound for serious offers; anything beyond belongs deeper in the funnel.
Performance Speed
Image alt text + ≤3 external scripts
Counts images (and how many are missing alt text) and external scripts. Every extra third-party script delays first paint. Portent's 2022 study found a page that loads in 1 second has 3x the conversion rate of one that loads in 5 seconds.
Overall score Roll-up
0 to 100, weighted by impact
Each check returns pass (full points), warn (half points), or fail (zero). The score is the weighted sum. Above 80 is ready to ship. 50 to 79 has fixable issues. Under 50 likely costs you most of the traffic you send to it.
Why these factors actually move conversion
Sources: WordStream Landing Page Benchmarks 2024, Portent Site Speed Report 2022, HubSpot Landing Page Stats 2024, Nielsen Norman Group Headline Research.
Honest answers.
It scores nine conversion factors against rules backed by published research: headline presence and length, CTA detection and clarity, social proof keywords, numeric proof stats, copy depth, heading hierarchy, mobile viewport plus responsive CSS, trust signal language, form field count, image count and alt text, and external script weight. Each check returns pass, warn, or fail with a specific fix.
Browsers block one site from fetching another site's HTML through JavaScript, a security rule called CORS. A URL-based analyzer needs a server middleman to bypass that, which means signups, rate limits, and a privacy trade-off. Paste-based analysis runs entirely in your browser, returns results in a second, and never sends your HTML anywhere.
Four levers cover most of the variance. One: a specific, outcome-driven headline (5 to 12 words). Two: a clear CTA repeated 3 to 5 times with an action verb, not "Submit" or "Click here". Three: visible social proof (numbers, testimonials, or recognizable logos). Four: a short form (3 fields or fewer for top-of-funnel, never more than 6). Trust signals, mobile readiness, and load speed amplify all four.
Five to twelve words. Conversion XL's eye-tracking studies and Nielsen Norman's headline research both find the same range: long enough to name a specific outcome ("Get 12 funnel templates in under 5 minutes"), short enough to read in under 3 seconds. Under 4 words rarely carries enough specificity. Over 12 words starts losing scanability, especially on mobile.
Three to five placements of the same CTA. Most converting pages put the primary CTA in the hero, after the main benefits, after the social proof section, in the FAQ area, and in the footer. All five buttons send to the same destination. Multiple competing CTAs (sign up vs learn more vs contact sales) usually hurt; repeating the same one helps.
It depends on the offer. Free downloads and email opt-ins work with 100 to 300 words: headline, two benefits, form, done. Paid offers, demos, and high-ticket products convert better with 800 to 2,000 words because the reader has more objections to handle. Marketing Experiments' research on copy length found that for considered purchases, longer copy out-performed shorter copy in 87% of tests.
Yes. The analyzer runs entirely in your browser using the built-in HTML parser. No HTML, no analysis results, and no metadata about the page is sent to systeme.io or any other server. You can verify this by opening your browser's DevTools network tab and watching the analyzer run.
Yes. The analyzer works on HTML from any page builder: ClickFunnels, Leadpages, Unbounce, Webflow, Carrd, WordPress, hand-coded HTML, anything. The rules check structure, copy patterns, and load weight, not platform-specific markup.
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