On-page vs off-page SEO: what is the difference?

On-page SEO is everything you change on your own pages: the copy, titles, headings, images and internal links. Off-page SEO is everything that happens on other sites and still affects how you rank: links to you, mentions of your brand, reviews and listings. The practical difference is control. You can rewrite a title this afternoon. You cannot make a journalist link to you.

Most guides add a third part, technical SEO, which covers whether search engines can crawl, render and index the site at all. This lesson compares the three and shows where the line between them blurs.

The three parts side by side

	On-page SEO	Technical SEO	Off-page SEO
What it covers	Content, titles, headings, images, structured data, internal anchors, matching what the searcher wants	Crawling, rendering, indexing, speed, canonicals, redirects, sitemaps, hreflang, site structure	Backlinks, brand mentions, reviews, citations, press coverage, people searching for your brand
Where the work happens	On your pages	In your site’s code and server	On other people’s sites
Who controls it	You, fully	You, fully	Third parties. You influence it
How fast you can change it	Hours to days	Days to weeks	Weeks to months
What it costs	Writing and editing time	Developer time	Outreach, content, PR or placement fees

The last two rows explain most of the difference in how the work feels. On-page changes are cheap and quick to test. Off-page changes need someone else to act, so they are slower and harder to predict.

What on-page SEO does

On-page work tells a search engine what a page is about and whether it answers the search. The main tasks are:

• writing copy that matches what the searcher is looking for
• a clear title and headings
• descriptive anchor text on internal links
• images with alt text
• structured data where it applies

None of this needs anyone’s permission. That also means every competitor can do it, and in a mature market most of them have.

What off-page SEO does

Off-page signals tell a search engine whether anyone else rates the site. A backlink from another website is the best known signal. The others are brand mentions without a link, reviews on third-party platforms, business listings and coverage in the press. What is off-page SEO goes through each one.

Because someone else must act, off-page SEO is mostly persuasion: pitching a story through digital PR, asking a partner for a link, or publishing something worth citing. The organised version of that work is called link building.

How Google’s own framing maps to the split

A Google engineer interview, published as an exhibit in the US antitrust case and reported in May 2025, describes the core relevance score as built from three inputs: anchors, body and clicks.

• Body is the text on the page. That is on-page SEO.
• Anchors are the clickable words of links that point to the page. Links from other sites are off-page. Links from your own pages are on-page.
• Clicks are what searchers do. Neither discipline controls them directly.

The same exhibit describes PageRank, a link-based signal, as an input to a separate quality score for the site. So on-page work and off-page work do not compete. They feed the same systems from different sides. Our lesson on the leak and court documents has the detail.

Where the line blurs

Internal links. You place them, so they are an on-page task. But they carry anchor text, and they pass the value of external links from the pages that earn them to the pages that need them. A site that earns links to a guide and never links from that guide to its product pages has done half the job. See which pages need links.

Linkable content. Writing a study or building a calculator is on-page work. Its purpose is off-page: to give other sites a reason to link.

Technical faults that waste links. A page with backlinks that now returns an error, or a redirect that points somewhere irrelevant, loses value you already earned. The fix is technical. The loss is off-page. Link reclamation deals with this.

Local listings. Your business profile and directory entries sit on other platforms, yet you write and manage them yourself.

Which matters more

It depends on what the competition has already done.

In a market with little competition, good on-page work is often enough. Google’s Gary Illyes said in April 2024 that Google needs “very few links” to rank pages.

In a competitive market, on-page quality is the entry ticket. When every result on page one has solid content and a working site, the remaining difference is what the rest of the web says about each one.

The data supports a middle position. Ahrefs’ study of one million US keywords, published in January 2025, found a correlation of 0.255 between the number of referring domains and rankings. That is real but modest, and slightly lower than in 2019. The link was stronger for local searches, at 0.33, and weaker for commercial and transactional ones. A correlation does not prove cause, since pages that rank well also attract more links. Do backlinks still matter looks at the evidence in full.

The order to work in

This is a working method, not a rule from Google.

1. Fix technical blockers. A page that cannot be crawled or indexed gains nothing from content or links.
2. Get the on-page basics right for the pages that should rank. Match the search, write a clear title, link to the page from related pages on your own site.
3. Recover off-page value you already have. Fix broken pages that have backlinks and claim your business listings.
4. Start earning new off-page signals, and keep going. This part does not finish.

Steps 1 to 3 are cheap and under your control. Step 4 is where most of the budget goes in competitive markets.

Measuring each side

On-page and technical work show up in Google Search Console, which is free: which pages are indexed, which searches they appear for and how often they are clicked. Off-page work needs a link index. Search Console’s Links report shows a sample of your backlinks, and the paid tools in our backlink tools comparison crawl the web themselves to show more.

Where to go next

The next lesson, on link building, covers the largest part of off-page work. Any term you do not know is in the glossary.