The meta description is the most misunderstood tag in on-page SEO. It is not a ranking factor and has not been one for well over a decade. Google rewrites it roughly two-thirds of the time. And yet skipping it is still a mistake, because when Google does use what you wrote, it is the sentence deciding whether a searcher clicks your result or the one below it. Understanding what the tag can and cannot do is what separates writing useful ones from writing them out of habit.
What It Is
The meta description is an HTML tag in the <head> summarising the page:
<meta name="description" content="A short summary of what this page covers and why someone should read it.">Its only job is to appear as the snippet beneath your title in search results. It does not appear on the page itself and has no effect on how Google understands your content.
It Is Not a Ranking Factor
Google confirmed this in 2009 and has repeated it many times since. Keywords in your meta description do not help you rank.
The indirect effect is real, though, and worth being precise about. A description that earns more clicks improves your click-through rate. Google has been inconsistent about whether CTR feeds into rankings directly, so do not treat it as a lever you can pull. What is unambiguous is that more clicks means more traffic from the position you already hold — and that alone justifies writing them.
Think of the meta description as advertising copy for a listing you have already won, not as a way to win the listing.
Why Google Rewrites Them
Studies consistently find Google replaces the supplied meta description somewhere around 60–70% of the time. It is not ignoring you arbitrarily.
Google rewrites when it believes text from the page matches the specific query better than your generic summary. If someone searches a narrow question and your description is a broad overview, Google will often pull the paragraph that actually answers it — which is usually the right call for the searcher.
Rewrites are more likely when:
- The description is missing, duplicated across pages, or auto-generated boilerplate
- The description is stuffed with keywords rather than written for humans
- The query is long-tail and specific
- The page contains a passage that answers the query more directly
What to do about it: write good descriptions anyway, and make sure your on-page content contains clear, direct answers near relevant headings. If Google is going to pull from the page, give it something worth pulling. You cannot force it to use your version — data-nosnippet and max-snippet control whether snippets appear at all, not which text is chosen.
The Right Length
Google truncates by pixel width, not character count, so any character figure is an approximation. The practical guidance:
- Desktop: roughly 155–160 characters before truncation
- Mobile: roughly 120 characters
Write for around 150 characters, and front-load the important part in the first 120. That way the message survives on mobile and the full version reads well on desktop.
Do not pad to hit a number. A sharp 90-character description beats a 155-character one with filler. Length is a ceiling, not a target.
Writing Ones That Earn Clicks
Answer the query, do not restate the title. The title says what the page is. The description should say what the reader gets. Repeating the title wastes the only real estate you control.
Front-load the substance. Assume the last third gets cut.
Include the target keyword naturally. Not for ranking — Google bolds query terms in the snippet, which draws the eye. One natural mention is enough.
Be specific. “Learn about SEO” tells nobody anything. “The six keyword types, with examples of each and the page type that ranks for them” tells them exactly what they get.
Write in active voice and address the reader directly.
Match the page. Overselling produces clicks followed by immediate bounces, which helps nobody.
Make every one unique. Duplicate descriptions across pages are one of the strongest triggers for Google rewriting them, and Search Console flags them.
Include a differentiator where you have one — a number, a date, a free tool, a template. “With a template you can copy” is a reason to click.
Before and After
Weak: Learn about meta descriptions and SEO. Our blog covers meta descriptions, meta tags, and more SEO tips for your website.
Restates the title, stuffs keywords, promises nothing specific.
Better: Meta descriptions are not a ranking factor, but they decide whether anyone clicks. Here is the right length, why Google rewrites them, and how to write ones that work.
States a counter-intuitive fact, then names exactly what the reader gets.
Meta Description vs Meta Keywords
These get confused constantly, and the answer is short.
The meta keywords tag is dead. It looked like this:
<meta name="keywords" content="seo, meta tags, keywords">Google has ignored it since 2009 and said so publicly, because it was abused so heavily it carried no signal. Bing has indicated it may use it as a negative signal — evidence of spam.
Do not use meta keywords. If your CMS or SEO plugin still offers the field, leave it empty. There is no upside and a small downside, since it hands competitors your keyword targeting for free.
The meta description, by contrast, is worth writing. One is a summary shown to humans; the other was a machine-readable list nobody trusts.
Where They Are Needed
Always write one for:
- Homepage and key service pages
- Blog posts and guides
- Product and category pages
- Any page where a click is worth something
You can skip them for:
- Paginated pages beyond page one
- Archive and tag pages
- Utility pages nobody should land on from search
For very large sites, a sensible template applied per page type beats leaving them blank, but a hand-written one always beats a template on pages that matter.
Checking Yours
Search Console → Performance shows CTR by page. Compare pages at similar positions — a page at position 6 with 2% CTR against another at position 6 with 8% has a snippet problem worth investigating. Our Google Search Console tutorial covers pulling that data.
Crawl your site to find missing, duplicate, or over-length descriptions. This is standard output from any site crawler and belongs in your regular review — see our SEO audit checklist.
Check what Google actually shows. Search a few of your own pages and see whether your description or a rewrite appears. Frequent rewrites on important pages suggest your descriptions are too generic.
Small Tag, Real Return
Meta descriptions sit in an odd position: genuinely not a ranking factor, frequently overridden, and still worth doing properly. The reason is simple arithmetic — improving CTR from 3% to 5% at an unchanged ranking position is a 60% traffic increase on that page, achieved with one sentence.
Write them for the person reading the results page, not for the algorithm. Keep them near 150 characters with the substance up front. Make each one unique and specific. And leave the meta keywords field empty, permanently.
Our on-page SEO checklist covers where this fits alongside titles, headings, and the rest of the on-page layer, and how to write title tags covers the other half of the snippet.
If you want an on-page audit covering titles, descriptions, and click-through performance across your site, our SEO services include exactly that. Reach out to the team at blogthememachine.com, and subscribe to our newsletter below for more guides.
