Your website may get visitors but no leads. That’s costly. Usually it’s not one issue, but a combination of six common problems.
This article lists those six causes, how to test them quickly and what to fix first. You get concrete tests, sample numbers and a short priority plan. No fluff—just steps you can run tomorrow.
The six most common causes
- Wrong audience or low-quality traffic
Symptom: lots of sessions but a low contact conversion rate (<0.5%).
Test: check where visitors come from in Analytics and Search Console. Are they branded searches or unrelated queries? Use Google Search Essentials to verify content-intent match.
First fix: pick one landing page and match it to a single intent (e.g., "custom web app quote"). Set measurable goals and review after two weeks.
Indicative cost: €0–€1,000 (internal analysis to light content work).
- Weak messaging and unclear proposition
Symptom: visitors skim and bounce on long pages.
Test: open the high-traffic page and check 1) what’s visible above the fold, 2) whether a clear CTA exists. Nielsen Norman Group shows users scan pages quickly.
First fix: rewrite the top of the page into one clear sentence: who you help, what you do, and one visible CTA. Measure CTA CTR.
Indicative cost: €300–€2,000 (copy, small UX changes).
- UX and conversion flow issues
Symptom: visitors interact but don’t complete forms.
Tests:
- Do a basic heuristic review using Nielsen Norman Group heuristics.
- Run a moderated 1–2 user test to watch the flow.
First fix: shorten the form. Remove non-essential fields. Run a quick A/B: full form vs short form.
Indicative cost: €200–€3,000 (from small copy tweaks to A/B tools and design).
- Performance and mobile problems
Symptom: high bounce on mobile and slow pages.
Test: run Core Web Vitals checks (LCP, INP, CLS) and see which metric fails. See the Core Web Vitals guide for thresholds and fixes: Core Web Vitals.
First fix: reduce LCP by optimizing images and improving server response. Implement simple image compression and lazy loading.
Indicative cost: €100–€5,000 (varies by cause; CDN and backend work cost more).
- Trust, legal and credibility issues
Symptom: visitors leave on the contact page or don’t start the form.
Test: is a short privacy note present by the form? Are phone and company registration details visible? Follow basic GDPR practices; the Dutch Authority for Personal Data has clear guidance.
First fix: add a concise privacy statement at the form and display a phone number and company details prominently.
Indicative cost: €0–€1,000 (text work; custom privacy policies may cost more).
- Tracking and analytics errors
Symptom: analytics show no conversions or inconsistent numbers.
Test: run test conversions and verify events land in GA4 or your analytics. Check for duplicate or missing scripts.
First fix: implement a short tracking checklist: GA4, events for form submit, phone clicks, and downloads. Perform one test conversion and verify receipt.
Indicative cost: €0–€1,000.
What to test first? Priority and timeline
- Week 0 (quick wins): verify tracking, visible CTAs and mobile layout. Cheap and fast.
- Week 1–2: run Core Web Vitals tests and update content.
- Week 3–6: A/B test form variants and landing pages.
- Month 2–3: revisit SEO intent and indexing with Google Search Essentials.
Note: SEO and trust-building take time. UX and form changes often yield faster results.
Quick audit checklist (do today)
- Verify analytics and conversion goals.
- Open site on mobile and desktop; note load times and visible CTAs.
- Count fields on the main lead form.
- Confirm privacy notice and contact details are visible.
- Run a Core Web Vitals test and record LCP, INP, CLS.
- Ask one prospect or colleague: can they understand your offer in 30 seconds?
Table: cause vs quick test vs first fix
Wrong traffic
- Quick test
- Analytics/Search Console
- First fix
- Align 1 landing page
- Effort
- Low–Medium
- Cost range
- €0–€1.000
Weak message
- Quick test
- 30s scan by user
- First fix
- Rewrite top-of-page
- Effort
- Low
- Cost range
- €300–€2.000
UX/forms
- Quick test
- Fill form yourself
- First fix
- Shorten form
- Effort
- Low–Medium
- Cost range
- €200–€3.000
Performance
- Quick test
- Core Web Vitals
- First fix
- Optimize images, caching
- Effort
- Medium–High
- Cost range
- €100–€5.000
Trust/GDPR
- Quick test
- Visual check
- First fix
- Add privacy note & contacts
- Effort
- Low
- Cost range
- €0–€1.000
Tracking
- Quick test
- Test conversion
- First fix
- Fix tags/events
- Effort
- Low
- Cost range
- €0–€1.000
| Cause | Quick test | First fix | Effort | Cost range |
|---|---|---|---|---|
| Wrong traffic | Analytics/Search Console | Align 1 landing page | Low–Medium | €0–€1.000 |
| Weak message | 30s scan by user | Rewrite top-of-page | Low | €300–€2.000 |
| UX/forms | Fill form yourself | Shorten form | Low–Medium | €200–€3.000 |
| Performance | Core Web Vitals | Optimize images, caching | Medium–High | €100–€5.000 |
| Trust/GDPR | Visual check | Add privacy note & contacts | Low | €0–€1.000 |
| Tracking | Test conversion | Fix tags/events | Low | €0–€1.000 |
Practical numbers
- Doubling conversion from 0.3% to 0.6% is realistic after simplifying forms and clarifying the CTA.
- Bringing LCP on mobile from 4s to <2.5s commonly reduces bounce by 10–30%.
All cost numbers are indicative and vary per CMS and level of custom work.
When to bring in external help?
- No internal analytics or dev resource.
- You made small changes with no effect after a couple of iterations.
If you want hands-on help, consider a short audit via /quote or a rebuild discussion at /website-laten-maken. DevCru is a senior-led web and app development team from the Netherlands; we build custom sites and support them.
Short final note: start with measurement and simple fixes. They often yield the largest gains. If you want, we can review your audit results and prioritise next steps via /quote.
Sources
Every figure and guideline in this article can be checked in the sources below.
- Google Search Essentials — Google Search Central
- Core Web Vitals — web.dev (Google)
- 10 Usability Heuristics — Nielsen Norman Group
- AVG in het kort — Autoriteit Persoonsgegevens
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