convertio.co

Readiness by lane

Green: convertio.co. Thin bar: Web Tools peer median.

Priority fixes for convertio.co

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

1. Priority 1 · Accelerate

   Modern image formats in use

   Observed: The homepage had 7 images and none used WebP or AVIF.

   Why it matters: WebP and AVIF are typically much smaller than JPEG or PNG at similar quality, and images are often the heaviest part of a page.

   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.

   37% of Web Tools peers do this. Limit: Based on the homepage HTML delivered to an automated client; scripts that run later were not executed.

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

2. Priority 2 · Accelerate

   Offscreen images lazy-loaded

   Observed: The homepage had 7 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.

   59% of Web Tools peers do this.

   Guide: Lazy Loading Without Broken Pages

3. Priority 3 · Accelerate

   HTTP/3 advertised

   Observed: The homepage did not advertise HTTP/3 through an Alt-Svc header.

   What to do: Turn on HTTP/3 at your CDN. Browsers fall back to HTTP/2 automatically, so the risk is low.

   On Amazon CloudFront: Select HTTP/3 in the distribution's supported HTTP versions.

   56% of Web Tools peers do this.

   Guide: CDN Guide for Website Owners

4. Priority 4 · Harden

   Certificate lifetime of 100 days or less

   Observed: The certificate from Amazon had a 393-day validity period, longer than the 100-day maximum that applies from March 2027.

   What to do: Move to automated issuance and renewal now, while you still have time to test it.

   87% of Web Tools peers do this.

   Guide: HTTPS and TLS Guide for Website Owners

What convertio.co already does well

Practices fewer than half of Web Tools peers use.

• DMARC policy enforces quarantine or rejectDMARC policy p=quarantine.23% of peers
• HSTS kept for at least a yearHSTS with a 365-day max-age.30% of peers
• X-Content-Type-Options: nosniffnosniff header present.44% of peers

What we saw

Homepage checked

https://convertio.co/

Homepage response

HTTP 200

TLS

TLSv1.3, HTTP/2

Certificate

Amazon, 393-day validity, expiring 2026-12-29

CDN or edge

Amazon CloudFront

DNS operators

Amazon Route 53

HSTS

max-age 365 days

DMARC policy

p=quarantine

Homepage HTML

129 KB, gzip

Images on homepage

7

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

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