Website readiness profile · Snapshot 23 October 2026
uptodown.com
uptodown.com's public homepage, certificate and DNS checked against 31 practices and compared with 231 Programming & Software sites.
- Readiness index
- 70/100
- Ahead of
- 55%
- Practices observed
- 20/30
- Popularity band
- Top 50K
Programming & Software median 68
of measured Programming & Software sites
1 of 31 could not be measured
Chrome UX Report top-sites list
Readiness by lane
Green: uptodown.com. Thin bar: Programming & Software peer median.
Enable
82/100
Peers 81
Harden
58/100
Peers 59
Accelerate
82/100
Peers 65
Recover
0/100
Peers 7
Priority fixes for uptodown.com
Ordered by impact and by how common each practice is among peers.
Priority 1 · Harden
HSTS kept for at least a year
Observed: Strict-Transport-Security was sent with a max-age of 185 days, below the one-year benchmark.
Why it matters: HSTS tells browsers to use HTTPS for your host on every later visit, which removes the window where a first HTTP request can be intercepted.
What to do: Send Strict-Transport-Security on HTTPS responses. Start with a short max-age (for example 300 seconds), confirm every subdomain works over HTTPS, then raise it in steps to 31536000. Add includeSubDomains only when all subdomains are HTTPS. HSTS preload is optional and hard to undo; hstspreload.org itself does not recommend it by default.
On Fastly: Add the header in VCL or a header rule as described in Fastly's HSTS guide.
40% of Programming & Software peers do this. Limit: Read from the homepage response only; other pages or regions may send different headers.
Priority 2 · Enable
XML sitemap discoverable
Observed: No sitemap was listed in robots.txt or found at /sitemap.xml.
What to do: Generate an XML sitemap of canonical URLs, reference it in robots.txt and submit it in Google Search Console.
69% of Programming & Software peers do this.
Guide: XML Sitemap Guide: Include Only URLs You Stand Behind
Priority 3 · Harden
DMARC policy enforces quarantine or reject
Observed: The DMARC policy for uptodown.com was p=none, which asks receivers to take no action on failing mail.
What to do: Publish DMARC with p=none and a reporting address first, fix any legitimate senders that fail SPF or DKIM alignment, then move to quarantine and finally reject.
45% of Programming & Software peers do this.
Priority 4 · Accelerate
Modern image formats in use
Observed: The homepage had 393 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.
42% of Programming & Software peers do this.
Guide: AVIF, WebP, JPEG, and PNG: Choose the Right Image Format
What uptodown.com already does well
Practices fewer than half of Programming & Software peers use.
- CAA records limit who can issue certificatesCAA limits issuance to certainly.com, letsencrypt.org, sectigo.com.23% of peers
- Referrer-Policy setReferrer-Policy present.24% of peers
- HTTP/3 advertisedHTTP/3 advertised.40% of peers
What we saw
- Homepage checked
- https://www.uptodown.com/
- Homepage response
- HTTP 200
- TLS
- TLSv1.3, HTTP/2
- Certificate
- Certainly, 29-day validity, expiring 2026-11-22
- CDN or edge
- Fastly
- DNS operators
- ClouDNS
- HSTS
- max-age 185 days, includeSubDomains, preload
- DMARC policy
- p=none
- Homepage HTML
- 365 KB, br
- Images on homepage
- 393 (svg 75)
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
Not observed 10
Observed 20
- HTTP requests move to HTTPS
- TLS 1.3 negotiated
- Certificate has more than 14 days left
- Certificate lifetime of 100 days or less
- CAA records limit who can issue certificates
- Framing restricted
- Referrer-Policy set
- HTTP/2 negotiated
- HTTP/3 advertised
- HTML compressed
- Offscreen images lazy-loaded
- No render-blocking scripts in <head>
- robots.txt published
- Canonical URL declared
- Meta description written
- Mobile viewport configured
- Structured data present
- Social preview image set
- Page language declared
- At most one redirect to the homepage
Not measured 1
- Static files cached for 30 days or more
Own uptodown.com?
Re-run the checks after a change, or verify the site in a free workspace to save reports with history, compare against similar sites and competitors, and track a private action plan. What owners get.
Live status for this site: Status Is Down: uptodown.com. This profile covers configuration only.