Most eCommerce brands don’t know their email template is underperforming until they see a competitor’s email and think, “Wow, that’s so much better than ours.” By that point, they’ve already left significant revenue on the table. An email design audit is a systematic review of your Klaviyo templates to identify design issues that are suppressing clicks, conversions, and revenue. Here’s how to conduct one — and what to fix.
10-Point Email Design Audit Checklist
1. Mobile Rendering Test
Send your email to a personal Gmail and Apple Mail account and open on a mobile device. Does it render correctly? Text should be readable without zooming, images should scale properly, and the CTA button should be large enough to tap comfortably (44px minimum height). This is the single most important test in your Klaviyo template audit.
2. CTA Clarity Test
Show your email to someone unfamiliar with your brand for 5 seconds, then ask: “What were you supposed to do in this email?” If they can’t answer confidently, your CTA hierarchy is unclear. Fix: ensure one dominant CTA button per email, placed above the fold on mobile, with high contrast and specific action copy.
3. Brand Consistency Check
Pull up your Shopify store homepage and your email side-by-side. Do they look like they belong to the same brand? Check: logo sizing, color palette, typography, image style, and tone of voice. Inconsistencies between your website and email erode the brand experience and reduce trust.
4. Load Time and Image Optimization
Large, uncompressed images slow load times and trigger spam filters. Check: are your images compressed to under 200KB each? Are you using WebP or JPEG rather than PNG for photos? Does the email have a reasonable text-to-image ratio (at least 60% text)? Tools like Litmus or Email on Acid can flag image-heavy emails before they hit inboxes.
5. Preheader Text Review
The preheader is the text that appears after the subject line in the inbox preview. Check your Klaviyo templates — is the preheader set intentionally? If not, Klaviyo defaults to the first visible text in the email, which can be something like “View in browser” or alt text for an image. A well-crafted preheader can increase open rates by 5-15%.
6. Alt Text Audit
Email clients — especially Outlook — frequently block images by default. If your email is all images with no alt text, subscribers who see blocked images see a blank email. Audit every image in every Klaviyo template: does it have descriptive alt text that conveys the message even without the image?
7. Dark Mode Compatibility
As of 2026, over 30% of email subscribers use dark mode. Check how your Klaviyo templates render in dark mode — this is especially important for templates with white backgrounds and dark text. Transparent PNG logos on white backgrounds often appear invisible in dark mode. Test using Litmus or Apple Mail’s dark mode preview.
8. Link Audit
Click every link in your most-used Klaviyo templates. Are all links working? Are they correctly tracked with UTM parameters? Is the primary CTA button linked to the most conversion-relevant page (product page or collection, not your homepage)? Broken or wrong links directly cost revenue.
9. Personalization Review
Are you using Klaviyo’s personalization variables? At minimum, every email should use first-name personalization in the greeting or subject line. Advanced: are your flow emails using dynamic product blocks based on purchase history or browsing? If not, you’re sending the same generic email to your most loyal customers and your most recent subscribers — a missed opportunity.
10. Footer Compliance Check
Every Klaviyo email must have a functional unsubscribe link, your physical mailing address, and (for GDPR-applicable lists) appropriate consent language. Check: is your footer design clean and complete? Is the unsubscribe link easy to find? Compliance issues can trigger spam complaints and damage deliverability.
What to Do After Your Audit
- Prioritize fixes by revenue impact — CTA clarity and mobile rendering issues should be fixed first, as they affect every email you send
- Fix flows before campaigns — flows run 24/7; campaign issues only affect the next send
- Document your brand standards — create a simple brand guide for email that covers logo size, colors, fonts, and image style so future emails stay consistent
- Set a quarterly audit cadence — email templates drift over time as different team members make edits; regular audits prevent gradual degradation
Frequently Asked Questions
How long does an email design audit take?
A thorough audit of all Klaviyo templates across flows and campaign templates typically takes 4-8 hours when done manually. Professional email designers can often complete an audit faster and identify issues that require technical expertise — like Outlook rendering bugs or dark mode compatibility issues.
How do I know which email design issues are costing the most revenue?
Focus on your highest-traffic flows: abandoned cart and welcome series. Calculate revenue per email sent for each flow. If these are below industry benchmarks (abandoned cart: $3-8/email sent; welcome: $1-3/email sent), the design is likely a significant factor. A/B testing before and after design changes gives you direct attribution data.
Should I redesign my entire template system or fix issues individually?
If your templates are 2+ years old, a full redesign is often more cost-effective than patching individual issues. Start fresh with a brand-consistent master template, then adapt it for each email type. Individual fixes make sense for newer templates where the underlying design is sound but specific elements need optimization.
About the Author
Muhammad Huzaifa is an eCommerce email designer specializing in Klaviyo flows and campaigns. He offers email design audits and full template redesigns for DTC brands ready to unlock more revenue from their existing list. View his portfolio →