A meta description is the short summary under your title in search results. The practical length is about 120 to 155 characters, which fits within roughly 920 pixels on desktop. On mobile, Google shows a little less. Anything longer is usually cut off with "…".
What a meta description does
The meta description sits in the page's head:
<meta name="description" content="Check any meta description in seconds. See its length in pixels and characters, and how Google will show it.">It is not a ranking factor. Google has said so for years. But it matters because it shapes the click: a clear description that matches the search makes people choose your result over the one above it. More clicks from the same ranking is free traffic.
Characters vs pixels
Like titles, descriptions are limited by width, not a character count. Google's snippet area holds about two lines on desktop. Wide letters and capitals use the space faster than narrow ones. The checker below measures your description in pixels so you can see where it will be cut.
| Length | What usually happens |
|---|---|
| Under 70 characters | Shows in full, but wastes space and may be replaced |
| 120–155 characters | The sweet spot: full message, no truncation |
| Over 160 characters | Often cut off with "…" |