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Steps to follow to optimize your website for SEO
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Optimize your website for SEO

Here are some tips to optimize your website for SEO:


Useful files


This file is useful for search engines and allows you to tell the engine not to search through some files/folders.

You can also use it to link your sitemap.


User-Agent: *
Disallow: /randomFolder/*


If one of your pages is already indexed and you don't want it to be anymore, you can add the tag
<meta name="robots" content="NOINDEX,NOFOLLOW" />
At the top of your <head> tag.


This file allows your website to give every useful information it can to search engines for a better indexing.

Informations like the language, the priority level, the last edition date and the edition frequency of each page can help search engines index your website higher.


<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="">

The <changefreq> tag accepts to following values: always, hourly, daily, weekly, monthly, yearly, never

The <priority> tag value ranges from 0.0 to 1.0. Its default value if 0.5.
It lets search engines know which pages are the most important on your website (the higher the most important).

Error page

Whenever a page is removed or a user types an URL wrong, it's better to show him a specific error page instead of the default one.
This page should retain the global aspect of your website and redirect the user to other pages related to his search, in order to keep the user invested.

Creating a 404.html file and adding

ErrorDocument 404 /404.html

To your .htaccess will do the trick just fine.

Loading time

Convert your images to .webp

Using the new image format WebP, which allows for a powerful image size compression without losing quality can greatly improve your loading time.

I recommend using WebPConv to convert your images to WebP.
It's easy to use and requires no further configuration.
The converted files can be found on your Desktop.

I suggest creating a webp/ folder containing every converted source in your image folder, which retains the file tree of your original folder.

Then, all you have to do is replace your basic <img src="logo.png" alt="Logo" class="whatev"> with:

  <source srcset="img/webp/logo.webp" type="image/webp">
  <source srcset="img/logo.png" type="image/png">
  <img src="img/logo.png" alt="Logo" class="whatev">

The browser will first try to load logo.webp, if it can't, it will load logo.png. If the browser doesn't support the <picture> & <source> tags, it will default to the <img> tag.

Delay Javascript non-necessary loading

You should try to load as little ressources as possible before the body of your page. The less time your page spends on loading Javascript, the more search engines will have to look at your website.

  1. Use the async attribute: <script src="..." async></script>
  2. Place your Javascript code at the end of your <body> tag.

Load CSS without blocking render

Same as the Javascript, you should also defer as many CSS files as you can (without impacting your page layout, though).

The trick here is to load the CSS without blocking the rest of the page.
Replace your old CSS imports with:

  <link rel="stylesheet" href="css/yourcss.min.css">

First, the media attribute of your <link> tags is set to none, which prevents the browser to load the CSS file.
The onload attribute will set the media attribute back to all, triggering the loading of the file after the tag has been loaded, so the browser has moved on to render something else.
If Javascript isn't enabled, the <noscript> tag imports your CSS file the usual way, ignoring the above statement.

Mobile version

Make sure your website is adapted for every device out there. Keep in mind that more than 50% of users are visiting your website from a mobile device.
Google now uses a mobile-based index, so having a functionnal mobile version is more important than ever.

Structured Data

Including Structured Data on every page of your website will allow Google to display your pages in a better way. See Intro to Structured Data for more informations.

Here is a basic example of what a Breadcrumb Structured Data script will look like in your HTML:

<script type="application/ld+json">
    "@context": "",
    "@type": "BreadcrumbList",
    "itemListElement": [{
        "@type": "ListItem",
        "position": 1,
        "item": {
        "@id": "",
        "name": "Home"
        "@type": "ListItem",
        "position": 2,
        "item": {
        "@id": "",
        "name": "Whatever"

Website semantic


URLs should be:

  • No longer than 115 characters
  • At most 4 level deep (
  • Clean, without URL parameters or non ASCII characters
  • Accessible via HTTPS (Let's Encrypt offers free certificates)


Every page of your website should have a <title> tag.
It should be:

  • Unique
  • Less than 65 characters long
  • Describe your page content.
  • Contain a main keyword


Every page of your website should have a <meta name="description" content="..."> tag. THis is what most search engines will display below the title of your website and its URL.
It should be:

  • Unique
  • Less than 150 characters long
  • Describe your page content.


The <meta name="keywords" content="..."> tag is no longer neede for SEO.
If anything, it gives your competitors an easy way to target your own keywords, so don't use it.


Your pages should have a well-structured hierarchy, using title tags:

<!-- BAD -->

<!-- GOOD -->

The <h1> title is the most important of all, as it is used by search engines to classify your pages the same way your <title> tag is.


Each page of your website should:

  • Contain at least 200 words directly visible without needing to scroll down (don't forget to use many keywords for search purposes)
  • Contain around 1900 words total
  • Not be a duplicate from anywhere else, inside or outside of your website.
  • Contain a large set of predefined keywords (Define your keywords around your website main purpose)

See Google Keyword Planner

Image alt attribute

Don't forget to fill the alt attribute of every image on your website.
This is the text that will be displayed in case the image is unavailable and search engines use this a lot to categorize your content.
It is also useful for screen readers.

Google Analytics

Google Analytics is a great way to monitor your website progression and traffic.
Generate your own Google Analytics ID and insert the <script> tag Google generated for you at the top of the <head> tag of every page of your website.

Online analyzers


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