Free SERP simulator: title and meta description checker

How to use it

• Type a title and meta description, or load a live page to pull in its own.
• Add the keyword the page should rank for. The preview bolds it in the description, as Google does.
• Switch between desktop and mobile, and edit until nothing that matters falls past the cut-off.
• Work through the list under the preview: each line says what Google is likely to do and how to fix it.

How long should a title tag be?

Google says there's no limit on how long a title element can be, but it truncates the title link to fit the device width. On desktop that's about 600 pixels, usually 50 to 60 characters. On mobile the title can wrap onto a second line, which leaves room for about 70 to 80. This tool measures pixels, not characters, because letters vary: a title full of Ws runs out of room long before one full of Is.

Length also changes how often Google keeps your title. Zyppy studied 80,959 titles from 2,370 sites and found Google rewrote 61.6% of them. Titles of 51 to 60 characters were rewritten least.

How long should a meta description be?

Google sets no limit here either. It truncates descriptions to fit the screen: about 920 pixels on desktop, often 150 to 160 characters, and about 680 pixels on mobile, nearer 120. Put the point of the page in the first sentence, so the part that survives on a phone still makes sense.

Don't count on Google showing it. Its documentation says snippets are created primarily from the page content, and the meta description is used when it describes the page more accurately. Ahrefs checked the snippets for 20,000 keywords and found Google rewrote descriptions 62.78% of the time. Length made little difference: descriptions that were too long were rewritten 61.46% of the time, the rest 63.69%.

What makes Google rewrite a title

• Half-empty or vague titles, like "Home" or a product code. Say what the page is.
• Boilerplate: the same long title on every page with one word changed.
• Repetition: Google says there's no reason to have the same words or phrases appear multiple times.
• Square brackets: Zyppy saw 77.6% of titles with brackets rewritten. Pipes were changed 41% of the time and dashes 19.7%.
• A title that doesn't match the page's main heading, is out of date, or is in a different language from the page.

How common these problems are

HTTP Archive's 2025 Web Almanac, which crawls millions of sites, found a title on 98.6% of desktop pages but a meta description on only 67.7%. The median title is 77 characters, longer than a desktop result shows, so on a typical page the end of the title is already cut off. An older Semrush audit of 100,000 sites found duplicate titles on 35% of them and duplicate descriptions on 30%.

Snippets and AI Overviews

The robots rules that shape your snippet shape AI answers too. Google says nosnippet stops a page's content being used as a direct input for AI Overviews and AI Mode, and max-snippet limits how much of it can be used. When you load a live page, this tool reads its robots meta tag and X-Robots-Tag header and tells you if either is hiding your snippet. Which AI crawlers to allow in robots.txt covers the crawler side.

A title that earns the click is half the job. The page behind it has to deliver: how long a blog post should be covers the length, and the keyword density checker shows whether the page clearly says what it's about.