zalando.co.uk

Readiness by lane

Green: zalando.co.uk. Thin bar: E-Commerce & Marketplaces peer median.

Priority fixes for zalando.co.uk

Ordered by impact and by how common each practice is among peers.

1. Priority 1 · Enable

   XML sitemap discoverable

   Observed: No sitemap was listed in robots.txt or found at /sitemap.xml.

   Why it matters: A sitemap helps search engines find new and updated pages, especially on large or frequently updated sites.

   What to do: Generate an XML sitemap of canonical URLs, reference it in robots.txt and submit it in Google Search Console.

   87% of E-Commerce & Marketplaces peers do this. Limit: Only the standard location was requested, once, at the time of the check.

   Guide: XML Sitemap Guide: Include Only URLs You Stand Behind

2. Priority 2 · Accelerate

   Static files cached for 30 days or more

   Observed: A same-site stylesheet or script was cacheable for 6 hours, short of the 30-day benchmark.

   What to do: Give versioned (fingerprinted) CSS, JavaScript, fonts and images Cache-Control: public, max-age=31536000, immutable, and change the file name whenever the content changes.

   60% of E-Commerce & Marketplaces peers do this.

   Guide: Browser Caching Guide for Website Owners

3. Priority 3 · Accelerate

   Modern image formats in use

   Observed: The homepage had 17 images and none used WebP or AVIF.

   What to do: Serve WebP or AVIF with a JPEG or PNG fallback, either through an image CDN or by generating both formats at build time.

   47% of E-Commerce & Marketplaces peers do this.

   Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format

4. Priority 4 · Accelerate

   Offscreen images lazy-loaded

   Observed: The homepage had 17 images and none used loading="lazy".

   What to do: Add loading="lazy" to images below the fold. Do not lazy-load the main hero image, because that delays the largest visible element.

   72% of E-Commerce & Marketplaces peers do this.

   Guide: Lazy Loading Without Broken Pages

What zalando.co.uk already does well

Practices fewer than half of E-Commerce & Marketplaces peers use.

• security.txt publishedsecurity.txt with a contact found.7.6% of peers
• HSTS kept for at least a yearHSTS with a 1825-day max-age.32% of peers
• DMARC policy enforces quarantine or rejectDMARC policy p=reject.39% of peers

What we saw

Homepage checked

https://www.zalando.co.uk/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Let's Encrypt, 89-day validity, expiring 2026-11-30

CDN or edge

Akamai

DNS operators

Amazon Route 53

HSTS

max-age 1,825 days

DMARC policy

p=reject

Homepage HTML

562 KB, gzip

Images on homepage

17 (jpg 12, svg 10, png 1)

Limits: homepage only, one location, one moment. Header checks reflect the homepage response; other pages may differ.

Stack and providers

Seen in the homepage response, certificate and DNS. Provider pages compare how their customers configure the same checks.

All 31 checks

Select a gap for the method and fix. How each check works

Compare with other E-Commerce & Marketplaces sites

• waltonbd.com64
• woot.com64
• youla.ru64
• zalando.dk64
• zalando.gr64

E-Commerce & Marketplaces readiness benchmark