Does SITE123 support custom meta titles and descriptions?

Yes. SITE123 provides per-page SEO settings under the page editor\'s SEO tab. Each page has separate fields for Page Title, Description, and social sharing image. The page title is used as the HTML tag; the description becomes the meta description. SITE123 doesn\'t auto-generate meta descriptions from page content — each must be written manually. On the free SITE123 plan, per-page SEO title customisation is available, but the site displays a SITE123 promotional footer that creates additional page content affecting SEO quality signals.

Can I add structured data (JSON-LD) to a SITE123 website?

SITE123 has limited structured data support. The platform doesn\'t provide a built-in HTML code injection field for arbitrary JSON-LD across the full site. Some SITE123 plans allow a custom HTML widget that can accept a JSON-LD script block for per-page schema. SITE123\'s e-commerce functionality auto-generates some product-related metadata, but not Schema.org JSON-LD. For full structured data control (FAQPage, Article, Organisation, WebSite schema), migrating to a platform with HTML head injection (Webflow, Squarespace Business, or a custom CMS) provides significantly better structured data capabilities.

Does SITE123 generate a sitemap?

Yes. SITE123 generates a sitemap.xml automatically at yourdomain.com/sitemap.xml. The sitemap includes all published pages and is updated when pages are added or removed. SITE123 provides a built-in Google Search Console integration under Settings → SEO → Google Search Console that verifies ownership and submits the sitemap. Custom domain sites use the custom domain in sitemap URLs; free plan sites use the site123.me subdomain, which creates a canonical limitation for SEO-focused sites.

What are SITE123\'s main SEO limitations?

SITE123\'s primary SEO limitations are: (1) limited or no custom HTML injection on most plans, preventing JSON-LD structured data deployment; (2) no llms.txt capability via the standard interface; (3) limited URL slug control (SITE123 auto-generates slugs and doesn\'t always allow full customisation); (4) the free plan\'s site123.me subdomain means canonicals point to the subdomain rather than a branded custom domain. SITE123 is adequate for basic local business pages where meta tags and sitemap are the primary SEO needs, but insufficient for technically complex SEO deployments.

SITE123 SEO audit

SITE123 is a simple website builder focused on ease of use with built-in per-page meta tag settings and automatic sitemap generation. Custom JSON-LD structured data capability is limited across most plans, and llms.txt is not achievable through the standard interface. The free plan's site123.me subdomain creates canonical limitations for sites targeting organic search traffic. DeepSEOAnalysis audits your SITE123 site's technical SEO health with real Chrome user performance data.

Audit your SITE123 site free →

What we check on SITE123 websites

Meta tags and SEO settings

Page title field quality and keyword placement in SITE123 SEO tab
Meta description presence — must be manually entered in SITE123 SEO settings per page
Open Graph tags — SITE123 generates basic OG tags from SEO settings for social sharing
Promotional footer content on free plans affecting page quality signals

Canonical URL and domain configuration

Canonical tag — SITE123 generates canonicals to custom domain on paid plans
Free plan canonical to site123.me subdomain — significant SEO limitation for organic traffic goals
URL slug format — SITE123 auto-generates slugs with limited customisation options
HTTPS availability — SITE123 provides SSL on both free and paid plans

Structured data capabilities

Custom HTML widget availability by plan — limited JSON-LD injection capability on most plans
FAQPage schema server-rendering status — if injected, must be in initial HTML response
Auto-generated e-commerce metadata vs Schema.org JSON-LD for product pages
Property-level validation of any structured data present on the page

Sitemap and crawl configuration

Auto-generated sitemap.xml completeness
robots.txt configuration — SITE123 controls robots.txt; typically allows all crawlers
AI crawler access: GPTBot, ClaudeBot, PerplexityBot, Google-Extended in robots.txt
llms.txt — not deployable on SITE123 via standard interface (platform limitation)

Core Web Vitals field data

LCP: SITE123 banner and hero image loading and fetchpriority configuration
CLS: SITE123's block-based layout and image placeholder handling
INP: SITE123's JavaScript and interactive widget load impact on interaction responsiveness
p75 CrUX field data from real Chrome users — reflects actual ranking signal performance

AI visibility assessment

AI crawler access in robots.txt — SITE123 default typically allows all AI bots
llms.txt absence — platform constraint; not deployable via SITE123 interface
FAQPage schema availability — dependent on custom HTML widget access on plan
Question-heading ratio: H2/H3 section headings as explicit questions
Content section length for AI extractability — average words per heading section

SITE123 SEO: what works and what's limited

SITE123 covers the basic SEO requirements that matter for most small business websites: per-page meta title and description, automatic sitemap, Google Search Console integration, and HTTPS. For a local business or personal portfolio where meta tags and indexation are the primary concerns, SITE123's built-in SEO features are sufficient. The GSC integration (Settings → SEO → Google Search Console) simplifies sitemap submission and basic performance monitoring without requiring manual GSC configuration.

SITE123's SEO ceiling is primarily limited by structured data support. Most SITE123 plans don't provide a site-wide HTML head injection field, meaning Organisation and WebSite schema can't be added globally. FAQPage schema — which directly enables FAQ rich results and improves AI visibility — requires per-page custom HTML widget support that is plan-dependent. For e-commerce sites needing Product schema, or service sites needing LocalBusiness and FAQPage schema, SITE123's structured data limitations become a significant SEO constraint.

The free plan's SITE123 promotional content (footer and header elements added by SITE123) also affects page quality signals. Google's systems assess the quality of the overall page, including content added by third-party platforms. For sites targeting competitive search queries, upgrading to a paid SITE123 plan (which removes promotional content) or migrating to a platform with full HTML control is advisable.

Frequently asked questions

Does SITE123 support custom meta titles and descriptions?: Yes. SITE123 provides per-page SEO settings under the page editor\'s SEO tab. Each page has separate fields for Page Title, Description, and social sharing image. The page title is used as the HTML <title> tag; the description becomes the meta description. SITE123 doesn\'t auto-generate meta descriptions from page content — each must be written manually. On the free SITE123 plan, per-page SEO title customisation is available, but the site displays a SITE123 promotional footer that creates additional page content affecting SEO quality signals.
Can I add structured data (JSON-LD) to a SITE123 website?: SITE123 has limited structured data support. The platform doesn\'t provide a built-in HTML code injection field for arbitrary JSON-LD across the full site. Some SITE123 plans allow a custom HTML widget that can accept a JSON-LD script block for per-page schema. SITE123\'s e-commerce functionality auto-generates some product-related metadata, but not Schema.org JSON-LD. For full structured data control (FAQPage, Article, Organisation, WebSite schema), migrating to a platform with HTML head injection (Webflow, Squarespace Business, or a custom CMS) provides significantly better structured data capabilities.
Does SITE123 generate a sitemap?: Yes. SITE123 generates a sitemap.xml automatically at yourdomain.com/sitemap.xml. The sitemap includes all published pages and is updated when pages are added or removed. SITE123 provides a built-in Google Search Console integration under Settings → SEO → Google Search Console that verifies ownership and submits the sitemap. Custom domain sites use the custom domain in sitemap URLs; free plan sites use the site123.me subdomain, which creates a canonical limitation for SEO-focused sites.
What are SITE123\'s main SEO limitations?: SITE123\'s primary SEO limitations are: (1) limited or no custom HTML injection on most plans, preventing JSON-LD structured data deployment; (2) no llms.txt capability via the standard interface; (3) limited URL slug control (SITE123 auto-generates slugs and doesn\'t always allow full customisation); (4) the free plan\'s site123.me subdomain means canonicals point to the subdomain rather than a branded custom domain. SITE123 is adequate for basic local business pages where meta tags and sitemap are the primary SEO needs, but insufficient for technically complex SEO deployments.