What this SERP simulator shows
A search result has three lines you control, more or less: the title, the URL, and the snippet under it. This SERP preview tool draws all three the way a results page lays them out. It measures the title and the meta description in pixels and marks the point where each would be cut. Switch between desktop and mobile to see both. Type a search query and the matching words in the description turn bold, as they would in a real result.
Start with the honest part. This is a simulation. Google does not publish the widths it cuts at, and it often shows a title or description that is not the one you wrote. What the tool can tell you is whether your text fits the space a result usually has. It cannot promise Google will show it.
Everything you type is measured in your browser and goes nowhere. The “Load from URL” button is the one exception. It asks our server to fetch that page once, read its title, meta description, site name and favicon, and send them back. Nothing is stored.
Sources: Google[4]; Zyppy[9]; Ahrefs[11][10]. The two rewrite studies count differently: Zyppy counts any change, including small ones such as adding a brand, so its rate is higher than Google’s.
How the pixel widths are measured
Google cuts by width, so a title of narrow letters fits more characters than one full of capitals and Ws. To measure width without a browser, the tool keeps a table of how wide each character is in Arial. Google does not document the fonts or sizes its results use, so Arial at the sizes below is an assumption, the same one most SERP tools make. The tool adds up the widths and compares the total with a budget. Bold query words are measured with the bold widths, because they are wider.
| Field | Font size | Budget | Where the figure comes from |
|---|---|---|---|
| Desktop title | 20 px | 600 px | Ahrefs measured titles against 600 px; Moz advises under 60 characters |
| Desktop description | 14 px | 920 px | seoClarity gives 920 px; Screaming Frog flags over 985 px |
| Mobile title | 18 px | 660 px | Our approximation: two lines of a phone-width result |
| Mobile description | 14 px | 680 px | seoClarity gives 680 px |
None of these numbers comes from Google. Its documentation says only that a title link and a snippet are each “truncated in Google Search results as needed, typically to fit the device width”[1][2]. The figures are what SEO tools measured by looking at results. Ahrefs advises fitting within 600 px, “which is the limit for what SERPs can display”[10]. seoClarity puts the description limit at 920 pixels on desktop and 680 on mobile[15]. Screaming Frog’s crawler uses tighter and looser numbers, 561 px for titles and 985 px for descriptions, and says plainly that its figure “is an approximation and Google adjusts them frequently”[13][14]. Moz, in characters, says to keep titles under 60[12].
Why Google rewrites titles
Google does not have to use your title element. Its documentation lists what it draws on to build a title link: the title element, the main visual title on the page, headings such as the H1, the og:title meta tag, other large and prominent text, anchor text on the page, text in links pointing to the page, and WebSite structured data[1].
The same page names the problems that make Google look elsewhere:
- Half-empty titles, such as a title that is only “| Site Name”.
- Obsolete titles, such as last year’s date on a page that is updated every year.
- Inaccurate titles that do not reflect what the page is about.
- Micro-boilerplate: the same text repeated across a set of pages.
- No clear main title, when several headings compete.
- A language mismatch between the title and the page.
It also asks you to avoid keyword stuffing: “there’s no reason to have the same words or phrases appear multiple times”[1]. The checks under the preview flag three of these by pattern: a title that is one or two words, a title naming a past year, and a word repeated three times or more. They are prompts to look again, not predictions.
How often does it happen? In August 2021 Google said the title element was used “more than 80% of the time”[3]. A month later, after complaints, it said it had changed its system so title elements “are now used around 87% of the time”[4]. Outside measurements differ. Ahrefs found Google rewrote 33.4% of titles across 953,276 pages[10]. Zyppy found 61.6% of 80,959 titles changed in some way, with titles over 60 characters rewritten far more often[9]. The studies count small edits differently, which explains much of the gap.
The practical reading: a title that fits, describes the page and matches its main heading is the one Google has the least reason to replace. For worked examples and the full argument, see our guide to title tags.
Meta description length, and why Google often ignores it
The second field is a meta description length checker. It shows how much of your description fits on each device and how many characters are cut. Again, the caveat comes first. Google’s documentation says “snippets are primarily created from the page content itself”, and that it uses the meta description “if it might give users a more accurate description of the page than content taken directly from the page”[2]. The snippet can also change with the search. A page can show a different snippet for each query.
Ahrefs compared written meta descriptions with the snippets Google showed for 20,000 keywords. Google replaced them 62.78% of the time[11]. That study is from 2020 and used desktop results, so treat it as a rough guide, not a current rate.
Write one anyway. When Google does use it, it is your only chance to say what the page offers in your own words. Three rules cover most of it:
- Put the answer or the offer in the first 120 characters, so a phone shows it.
- Describe this page, not the site. A description repeated across pages is the one Google is most likely to skip.
- Use the words people search with. Matching words show in bold, which draws the eye.
If you want to stop Google showing a snippet at all, it documents controls for that: the nosnippet rule, a max-snippet length, and the data-nosnippet attribute for parts of a page[2]. Few pages should use them.
What changed on mobile
The mobile preview differs in more than width. In January 2025, Google stopped showing breadcrumbs on mobile results. On desktop, “the visible URL continues to have two parts: the domain and breadcrumb”. On mobile, “the visible URL will be simplified to the domain only”[5]. The preview follows that: the desktop result shows the path, and the phone shows the domain.
Both layouts show a site name and a favicon. The site name is for the whole site, and Google tries to take it from WebSite structured data on your home page[6]. The favicon must be square and at least 8 by 8 pixels, and Google prefers larger than 48 by 48[7]. When you load a page here, the tool picks the icon it would most likely use, but it does not check that Google has indexed it.
The optional date works the same way on both. Google may show a byline date “if this information is considered to be useful to the user”[8]. When it does, the date takes space at the start of the snippet, so turn it on to see what your description loses.
Titles, snippets and AI answers
A results page is no longer only ten blue links. For many searches an AI Overview sits above the first result, and the reader may never scroll to your snippet. What a SERP is made of now, and where AI answers sit on it, is covered in our explainer on SERPs. To see whether Google shows an AI Overview for a query, and which pages it cites, run the query through the AI Overview checker.
Links shared in apps use different tags again. LinkedIn, X, Slack and WhatsApp build their cards from Open Graph tags, not from the title element. The Open Graph checker shows those cards for any URL. And if a description reads badly once it is cut, the readability checker will find the long sentences behind it.
Before you publish a title and description
Work through this with the preview above. Your ticks are saved in this browser only.
Check every title on your site
This tool previews one page at a time. The titles that need it most are rarely the ones you think to check: the template that adds “| Home” to every page, or the product pages that share one description. The GEO Audit crawls your site and runs 31 checks on every page, including title length, meta description and whether the brand is in the title. The brand check uses the same test as the one in the preview.
The free account audits 10 pages with an email address and no card. Every limit is on the pricing page.
Questions people ask
What does a SERP simulator do?
It shows how a page's title and meta description would look in a Google result before you publish. This one measures each in pixels, because Google cuts by width rather than by character count, and shows where the cut falls on desktop and on mobile. It also bolds the words of a search query and checks the title for patterns Google's documentation lists as reasons to rewrite it.
How long should a title tag be?
Google sets no limit. Its documentation says a title link is truncated "as needed, typically to fit the device width". Moz says its research suggests about 90% of titles under 60 characters display correctly. Ahrefs measured titles against 600 px, and Zyppy found titles of 51 to 60 characters were rewritten least often, at 39% to 42%.
What is the right meta description length?
There is no official length. Google cuts the snippet to fit the screen. SEO tools have measured the cut at roughly 920 pixels on desktop and 680 pixels on mobile, about 155 and 120 characters of ordinary text. Put the point of the page in the first 120 characters, so it survives on a phone, and use this meta description length checker to see where your own text breaks.
Why does Google show a different title from mine?
Google builds a title link from several sources: the title element, the main heading, og:title, prominent text, anchor text and more. It replaces a title that is half empty, out of date, inaccurate, repeated across many pages, or keyword stuffed. Google said in 2021 that it used the title element about 87% of the time; third-party studies have measured lower rates.
Why does Google ignore my meta description?
Google's documentation says snippets are primarily created from the page content itself, and the meta description is used when it describes the page better than a passage would. Snippets also change with the query. An Ahrefs study of 20,000 keywords found Google rewrote meta descriptions 62.78% of the time.
Are the pixel limits exact?
No. They are measurements, and tools disagree: Screaming Frog flags titles over 561 px and descriptions over 985 px, while other tools use 600 px and about 920 px. We measure with Arial's character widths, which lands within a few pixels of a browser using Arial. Google does not document its fonts, so that is an assumption too. Google changes its layout without notice, so treat a pass as likely, not certain.
Does showing a date shorten the description?
Yes. When Google shows a byline date, it sits at the start of the snippet line and takes room the description would otherwise use. Tick the date option in the tool to see how much text you lose. Google decides when to show a date; you can only help it find the right one.