Technical SEO: The Minimum Checklist Before Launching a Website

Most visibility problems on a new website don't come from the content but from technical details left behind on launch day. They are silent errors: the site works, the pages open, and meanwhile search engines struggle to read them or ignore them entirely.

This is the sequence of checks we run before every launch. It doesn't cover everything you could do — it covers what you can't skip.

1. Make sure the site can be indexed

The first check concerns unintentional blocks. During development it's normal to keep search engines out, and just as normal to forget to remove that block at launch.

• The robots.txt file must not contain rules blocking the whole site.
• Public pages must not carry a noindex tag.
• The XML sitemap must exist, be reachable and contain only real pages.
• Every page needs a canonical URL pointing to itself, barring specific cases.

2. Review the URL structure

URLs should be decided before launch, because changing them later means redirects and wasted time. You want short, readable, stable addresses, consistent with the page hierarchy.

A good address tells you what the page contains without opening it. If you need to decode a numeric ID to understand it, it needs rework.

3. Unique titles and descriptions

Every page needs a title different from all the others. It sounds obvious, but on sites built from repeated templates it's the most frequent error: dozens of pages with the same title that search engines struggle to tell apart.

• Title: clear, specific, with the main term up front.
• Description: a useful summary for people scanning search results, not a keyword list.
• One single H1 heading per page, consistent with the title.

4. Real performance, not theoretical

Performance should be measured the way users experience it: on a mobile network, with an empty cache. A site that loads in one second on the developer's laptop can behave very differently on a smartphone on the move.

The heaviest factors are almost always the same: oversized images or dated formats, badly loaded web fonts, third-party scripts added without weighing their cost.

Images

Use modern formats, always declare width and height so the layout doesn't shift during loading, and lazy-load everything that isn't visible when the page opens.

5. Consistent structured data

Structured data helps engines understand the type of content. The one rule that matters: it must describe what the user actually sees on the page. Declaring elements that aren't visible is a mistake, not a shortcut.

6. Redirects, if you're replacing an existing site

When a site is rebuilt, every old address that had traffic or inbound links must be redirected to the closest new page by topic. Redirecting everything to the homepage is the shortcut that loses the most visibility.

• Export the list of the previous site's URLs.
• Map each one to its new destination.
• Verify the redirects after launch, not before.
• Watch crawl errors for a few weeks.

In short

Technical SEO doesn't grow traffic on its own: it removes the obstacles that stop the rest of the work from taking effect. It's a few hours of checks that, skipped, can cost months.