Meta Description Length: Pixel Width, Character Count, and CTR

Here is the uncomfortable thing about meta descriptions, and the reason this post is shorter on rules than you expect: Google ignores the one you wrote roughly 70% of the time. A 2020 Portent study of thousands of results found Google rewrote the meta description in about seven of every ten cases, pulling a sentence straight off the page instead. So before we talk about the "perfect length," understand that length only matters for the ~30% of the time your description actually appears, and that 30% is still worth getting right, because those are often your highest-intent queries.

This post covers the length and truncation mechanics of the description. For how to actually write copy that earns the click, see how to write SEO-friendly meta descriptions. For the headline above it, a completely separate element with its own pixel budget, see title tag length.

The pixel limit, same as titles

Like titles, Google does not count characters when it decides where to cut a description; it measures rendered pixel width. The description renders in a smaller font than the title (~14px on desktop), and Google clips it at roughly 920 pixels on desktop, which works out to about 155 to 160 characters of average English text.

| Surface | Pixel budget | Practical characters | |---------|-------------|---------------------| | Desktop SERP | ~920 px | ~155–160 | | Mobile SERP | narrower column | ~120–130 |

Because it is pixel width, the wide-vs-narrow-letter rule from titles applies here too: a description full of Ws and capitals clips earlier than one of the same character count in lowercase. (For the per-letter pixel breakdown, why W costs ~4× an i, see the title tag guide; it's the same font engine.) The practical move is to write your single most important sentence inside the first ~120 characters so it survives on both desktop and mobile, then let the rest trail off.

Don't eyeball it. Paste the description into our Character Counter; it shows characters, estimated pixel width, and a live SERP preview, so you see the real truncation point rather than trusting "160."

Why Google rewrites yours anyway

The rewrite is not a punishment; it is Google trying to match the specific query the searcher typed. Your one meta description is static; a single page can rank for dozens of queries, and Google often serves a different on-page snippet for each, bolding the matched words. That dynamic snippet frequently beats your hand-written line for relevance.

Google pulls from your page text instead of your tag when:

• The query is long-tail or specific and a sentence in your body answers it more directly than your generic description.
• Your description is boilerplate: the same line templated across the whole site, or a tagline that doesn't mention the page topic.
• Your description is missing, duplicated, or auto-clipped from the first 160 characters of body copy by the CMS.
• The description doesn't contain the searcher's words and a body sentence does.

So the description you write competes with your own page text. You raise the odds Google uses yours by making it tighter and more on-topic than any single sentence buried in your content, and by writing genuinely good body copy, because if Google's pick is going to come from the page anyway, you want the page sentences to be strong.

It does not affect rankings, at all

Let's kill the most persistent myth directly: the meta description is not a ranking factor. Google confirmed this years ago and has restated it repeatedly. Stuffing a keyword into the description does not move you up the results. There is no "keyword density" target for it, and the meta keywords tag, a different element, has been dead for over a decade; Google ignores it entirely.

What the description does affect is click-through rate. Two listings can rank #4 and #5; the one with the more compelling, query-matched snippet often wins the click. That CTR is a measurable business outcome on its own, independent of any ranking debate. So the honest framing is: write the description to sell the click, not to rank, and keep it inside the pixel budget so the sell isn't cut off mid-sentence.

Length mistakes that actually cost clicks

• Truncating the call to action. If your "Compare all 12 tools free" lands at character 165, the searcher sees "Compare all 12 too…". Front-load the hook.
• Writing 300 characters as a hedge. Some teams write long, betting the full version occasionally shows. It rarely does, and the visible portion ends up reading as a run-on. Write one tight ~155-character version instead.
• Letting the CMS auto-generate. A description that's just the first 160 characters of body text usually starts mid-thought ("...and that's why we built"). Set it explicitly per page.
• One description for the whole site. Duplicates give Google nothing to differentiate pages with, which pushes the rewrite rate toward 100%.
• Ignoring mobile. Read just the first 120 characters out loud. If it doesn't stand on its own, rewrite.

To generate and length-check descriptions page by page, use the Meta Tag Generator; to preview the exact SERP truncation, use the Character Counter.

Frequently Asked Questions

What is the ideal meta description length?

About 155–160 characters on desktop and 120–130 on mobile, because Google clips at roughly 920 pixels of rendered width rather than a fixed character count. Put your most important sentence in the first ~120 characters so it survives mobile truncation.

Does the meta description help my rankings?

No. Google has confirmed the meta description is not a ranking factor, and there is no keyword-density target for it. It affects click-through rate, not position; a better description can win clicks between two pages that already rank closely, but it won't move you up the results.

Why does Google show a different description than the one I wrote?

Google rewrites roughly 70% of descriptions, substituting a sentence from your page that better matches the specific query, often bolding the matched words. It does this when your description is boilerplate, duplicated, missing, or simply less query-relevant than your body text.

Is it worth writing meta descriptions if Google rewrites most of them?

Yes. The ~30% Google keeps are disproportionately your branded and high-intent queries, where the click matters most. A tight, on-topic description also lowers the rewrite rate, and writing one forces you to clarify each page's value.

Does the meta keywords tag do anything for SEO?

No. The <meta name="keywords"> tag has been ignored by Google for over a decade and can even hand competitors your keyword list. Leave it out and spend the effort on the description and title instead.