How to Use This Tool
Type or paste a description. The pixel width is measured in your browser with the same technique a renderer uses, and the preview shows roughly where the text would be cut.
Why "155 characters" is the wrong rule
Search results are laid out in a container of fixed width. Text is drawn into it and cut when it no longer fits. Nothing in that process counts characters.
Letters differ enormously in width. A lowercase i is roughly a third the width of a
capital W in the fonts Google uses. So two descriptions of identical character count can
differ by a factor of two or three in the space they occupy. One survives intact; the other is cut
mid-word. A tool reporting "148 / 155 — good" for both is confidently measuring the wrong quantity.
The measurement box above shows average pixels per character for your text. Watch it
move as you write. Text heavy in capitals, or in m and w, pushes it up; text
with many i, l and t pushes it down. That number is exactly the
information a character count throws away.
About the pixel limits used here
The desktop and mobile widths are the values commonly observed in search results, and they are Google's choice, not a standard. Google has changed them before and will again, it sometimes shows longer snippets for some queries, and it frequently ignores your description entirely and writes its own from the page. Treat the limit as a guide with real slack in it, not a specification.
What is not a guess is the relative measurement: if your description is wider than another one, it will be cut sooner. That holds no matter what the current limit is.
What the description actually does for you
It is worth being clear about this, because a lot of advice overstates it. A meta description is not a ranking factor. Google has said so repeatedly. It does not help you rank.
What it can do is affect whether someone clicks a result you already have. That makes it worth writing well and not worth agonising over. Two things matter more than length: whether it answers the question in the query, and whether it says something the competing three results do not.
Also note that Google rewrites descriptions often — studies have put it well above half of results. If it decides a passage from your page fits the query better, it uses that instead. Writing a good description raises the odds it is used; it does not guarantee it.
Practical rules that survive the limits changing
- Front-load. Put the specific, useful part first. If the tail is cut, nothing important is lost.
- Write one complete sentence early. A description cut mid-clause reads like a mistake; one that has already made its point reads fine with an ellipsis.
- Include the concrete noun a searcher typed — the format, the unit, the number. Matching terms are bolded in results, which is a visual cue that costs you nothing.
- Do not pad to hit a count. A short description that fully answers the query beats a long one stuffed to reach 155.
