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Glossary · SEO basics

on-page SEO

Also called on-site SEO

Reviewed 31 Oct 2026 By Madiha Fatima 4 min read Check it yourself: yes, free

4 min
Definition

On-page SEO is everything you can change on a page to help it rank and to make it worth clicking: the title tag, the headings, the words, the images and their alt text, the links to other pages and how fast the page loads. It is the part of SEO you control, which makes it the cheapest to fix.

It sits beside two other parts. Off-page SEO is what happens elsewhere, mostly links and mentions. Technical SEO is whether search engines can reach and read the site at all. On-page work is where a small business usually gets the quickest result, because the page simply did not say what it was about.

Short version: make the page say, clearly, what it is for.
Why it matters for your business

Most small business pages
never say what they are about.

Open the homepage of ten local businesses and the title tag on half of them reads 'Home'. The services page is called 'Services'. The headline says 'Welcome'. Google reads those words to decide what the page is for, and 'Home' is not a search anyone makes. On-page SEO is the unglamorous fix: say 'Family dentist in Harrogate' where it matters and let the page compete for that.

Because it is work on your own pages, it is also the part of a proposal you can check. A scope of work that says 'on-page optimisation of 15 pages' should produce 15 pages with new titles, headings and copy that you can see. If month three's report still lists 'on-page optimisation' with nothing you can point at, ask what changed.

Done well, on-page work also makes the page better for the person reading it. A clear heading, an answer in the first paragraph and a link to the next step are what visitors want too, which is why on-page fixes often lift conversion rate alongside rankings.

Example

One dental page, before and after
an afternoon of on-page work.

Before

Title tag: 'Services | Bright Smile'. Headline: 'Our services'. Four paragraphs about the clinic's philosophy, then a list of treatments with no links. Images named IMG_4471.jpg with no alt text. Loads in six seconds on a phone.

<title>Services | Bright Smile</title> <h1>Our services</h1>
After

Title tag: 'Invisalign in Reading | Bright Smile Dental'. Headline: 'Invisalign clear aligners in Reading'. The first paragraph says what it is, who it is for and how long it takes. One section per question patients actually ask, a photo with alt text 'patient holding a clear aligner', links to the pricing and booking pages and compressed images that load in two seconds. Same clinic, same treatment, same designer. The page now competes for 'Invisalign Reading' instead of for nothing.

How to check it on your site

Five checks on any page, no tools to pay for.

Tick each one as you go. 0 of 5 checked on your site.

  1. Read the title tag

    Hover over the browser tab, or view the source (Ctrl+U) and find <title>. It should name the service and the place, in roughly sixty characters, and be different on every page. 'Home', 'Services' or the same title repeated across the site is the most common on-page fault we see.

  2. Check there is one clear headline

    The main headline (the H1) should say what the page is about in plain words, not 'Welcome' or 'Our services'. Right-click the headline, choose Inspect and look for <h1>. One per page. If the logo is the H1, which some themes do, that is a fix for your developer.

  3. Read the first paragraph as a stranger

    Within two sentences a visitor should know what you offer, where and for whom. If the opening is about your values or your founding year, the search you want to rank for is probably not on the page at all.

  4. Look at the images

    Right-click an image and choose Inspect. The alt attribute should describe the picture in a few words. Empty alt text on every image, or file names like IMG_2201, mean a quick win for accessibility and image search. See alt text.

  5. Run PageSpeed Insights

    Paste the page into pagespeed.web.dev and look at the mobile result. Good Core Web Vitals is what you want. A poor result usually means oversized images or too many scripts, both of which are page-level fixes.

Related terms

Usually in the same sentence.

Read next

Where this shows up in practice.

Content Write for the question, not the keyword

How to write page copy that answers what people type, which is most of on-page SEO.

 Web design Say one clear thing

Why a page with one clear message converts and ranks better than one that says everything.

 Service SEO & AI search

On-page work across your key pages is month two of the SEO service, after the technical fixes.
Related service

On-page work on every important page is the second month of the SEO service, and new sites leave us with it already done. Prices are on the price list, not on a call.

See the SEO service
Reviewed by Madiha Fatima, founder of 99creatix

Every entry in this glossary is written and checked by the person who runs the agency, reviewed at least once a quarter and dated. Last reviewed 31 October 2026.

Spotted an error or a term we are missing? Tell us and it is fixed within the week.

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