There is no official character limit for meta descriptions. Google has never published one. That surprises a lot of people who've spent time trimming their descriptions to exactly 155 characters based on advice they read somewhere, advice that gets repeated so confidently across SEO blogs that it feels like a documented rule. It isn't. What actually exists is a display constraint, a pixel budget Google allocates to the snippet area in its search results, and the 155-character figure is just a rough approximation of how many average-width characters tend to fit inside that space before the text gets cut off with an ellipsis.
Understanding that distinction changes how you think about the whole task.
What Google Actually Measures: Pixels, Not Characters
Google's search results page allocates roughly 920 pixels of width to display the meta description snippet on desktop. The reason this matters is that character counts are an imprecise proxy for pixel width. A string of capital W's takes up considerably more horizontal space than the same number of lowercase i's. So a 155-character description full of wide characters might get truncated, while a 165-character description written with narrower characters might display completely. The 120-to-160 character range that most SEO guidance converges on isn't arbitrary. <cite index="15-1">Research testing descriptions across platforms found that staying between 120 and 160 characters allows the full text to display reliably across Google, Bing, Facebook, and similar platforms.</cite> But it's a practical guideline calibrated to average character widths, not an enforced limit.
Mobile complicates this further. The pixel budget shrinks on smaller screens, and <cite index="17-1">Google's own behavior after reverting from its 2017 snippet-length experiment suggested around 120 characters as the safer upper bound for mobile display.</cite> If you want a description that shows completely on both desktop and mobile without any truncation risk, writing to roughly 120 characters and front-loading your most important information into the first half is the more conservative approach.
Bing and Other Search Engines
Bing is more straightforward about this than Google. <cite index="14-1">Bing, Yahoo, and DuckDuckGo advise a maximum character count directly, unlike Google which specifies a pixel budget.</cite> Bing's documented guidance points to around 150-160 characters for desktop, which happens to align with the same practical range most Google-focused guidance arrives at. So the 120-to-160 window covers your bases reasonably well across the major search engines, even if each one is technically measuring something slightly different under the hood.
The Bigger Problem Nobody Warns You About
Here's the part that genuinely changes the calculus: even a perfectly crafted meta description, exactly the right length, with your primary keyword positioned early, may never actually appear in search results. <cite index="25-1">Studies examining search results for 30,000 keywords found Google rewrites meta descriptions at a rate of 71% on mobile and 68% on desktop.</cite> Ahrefs' own research puts the rewrite rate at around 62.78%. <cite index="31-1">Some 2024 and 2025 measurements have pushed past 80%.</cite>
What this means practically is that Google is pulling its own snippet from your page body content the majority of the time, based on what it considers most relevant to the specific query being searched. The description you wrote shows up in the HTML of your page, Google reads it, and then often decides it has a better excerpt.
<cite index="31-1">The most common triggers for a rewrite are: the description doesn't summarize the page well, the query doesn't match anything in your description, or you've used the same description across multiple pages.</cite> That last one is especially common on larger sites where descriptions get templated and duplicated, and it's the easiest one to fix.
So Is Writing One Still Worth It?
Yes, for reasons that are more specific than most guides acknowledge. <cite index="31-1">Around 30% of the time on page one, Google uses exactly what you wrote.</cite> For your most important pages, the ones where click-through rate has real business impact, that 30% is worth controlling. A meta description doesn't influence where your page ranks. <cite index="32-1">Google's Search Advocate John Mueller confirmed directly that "the meta description is primarily used as a snippet in the search results page, and that's not something that we would use for ranking."</cite> But ranking gets you onto the page. The description is what convinces a human to choose your result over the other nine visible at the same time.
The indirect connection to rankings exists through click-through rate. A description that earns more clicks than expected for a given position sends a positive behavioral signal. A description that oversells and then disappoints people once they land on the page does the opposite. Visitors who feel misled tend to bounce quickly, and that pogo-sticking behavior is something Google notices.
What a Good Meta Description Actually Contains
Length is the least interesting part of writing one. The more useful questions are whether it matches what the page genuinely delivers, whether it contains the search term the reader actually used (since Google bolds matched keywords in the snippet, making your result visually stand out), and whether it gives the reader a specific reason to click rather than a vague summary.
A description for a tool page should tell the reader what they can do, how fast, and what they don't have to deal with (sign-ups, uploads, wait times). A description for an article should hint at the answer without giving it away entirely. A description for a comparison page should indicate which comparison is being made. None of this is about character count. It's about writing for the person reading the snippet, not for the pixel budget measuring it.
Checking Your Own Pages
If you publish regularly, the fastest way to audit your descriptions isn't a third-party tool. It's Google Search Console. The Performance report shows impressions and clicks side by side, and a page with high impressions but a low click-through rate is usually a snippet problem. Either Google is rewriting your description into something less compelling, or the description you wrote isn't earning the click. Both are fixable once you know which pages to look at.
For counting and checking descriptions as you write them, our Word Counter handles character counts precisely, updating in real time as you type. Paste your draft description in, check the character count, trim or expand until it sits in the 120-to-155 range, and you have something that fits the practical display window without obsessing over pixel-perfect calculations. If you're also drafting the page content itself and want to check that your primary keyword appears in the right density before publishing, our Text Analyzer & Keyword Density runs the same analysis locally on whatever you paste in.
The Practical Answer to the Original Question
Write your meta descriptions. Keep them between 120 and 155 characters, put your most important information in the first half, match the language to the actual search terms your audience uses, and don't duplicate the same text across multiple pages. Beyond that, accept that Google will rewrite more than half of them anyway, and spend the time you'd otherwise use obsessing over character counts on making the page itself genuinely worth clicking through to. That's the thing neither Google nor any other search engine can rewrite for you.